Diagnostic Trouble Codes (DTCs)

• DTCs P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, P 0393, P2088, P2089, P2090, P2091, P2092, P2093, P2094 and P2095 are not installed.
• The engine is running.
• The ECM has detected the camshaft positions.
• DTCs P0008 and P0009 are set continuously if the above conditions are met.

• Inspect the engine for recent mechanical repairs to the engine. An improperly installed camshaft drive secondary circuit can cause this DTC to appear.
• One faulty camshaft control actuator or valve cannot cause this DTC. This diagnostic algorithm is designed to detect a mismatch between the primary intermediate sprocket and the secondary camshaft drive circuit, or a mismatch between the primary intermediate sprocket and the crankshaft. Any of these conditions can cause the cams of both shafts of the same cylinder bank to be out of phase by the same number of degrees.
• The presence of DTCs P0008 and P0009 together with P0016, P0017, P0018 and P0019 indicates a possible malfunction of the primary camshaft drive circuit and a mismatch between both idler sprockets and the crankshaft. It is also possible that the crankshaft pulse sensor is misaligned and does not correspond to top dead center (TDC) crankshaft.
• By comparing the desired and actual camshaft angle values with a scan tool prior to issuing a DTC, it can be determined whether the fault is related to one camshaft, one bank of cylinders, or is caused by a misalignment with the primary crankshaft.

1. Clear the DTCs with a scan tool.
2. Allow the engine to warm up to normal operating temperature.
3. Let the engine idle for 10 minutes or until the DTC sets. Use a scan tool to get information about trouble codes; DTCs P0008 and P0009 should not set.

1. Inspect the camshaft drive chains for wear or misalignment.
• If a malfunction is detected in the camshaft drive circuits or tensioners, refer to the section "Camshaft Drive Chain Components", Part 1C2, "The mechanical part of the HFV6 3.2 L engine.»
2. Check if the pulse sensor is correctly installed on the crankshaft.
• If a malfunction is found related to the crankshaft, refer to the section "Crankshaft and main bearings", Part 1C2, "The mechanical part of the HFV6 3.2 L engine.»

• Engine speed is above 80 rpm.
• Ignition voltage 1 in the range of 10-18 V.
• The ECM has commanded the camshaft timing actuator solenoid on and off at least once during an ignition cycle.
• DTCs P0010, P0013, P0020, P0023, P2088, P2089, P2090, P2091, P2092, P2093, P2094 and P2095 are set continuously when the above conditions are met for more than 1 second.

• The ECM has detected an open, short to ground, or short to power (B+) in the CMP solenoid circuit when the solenoid is commanded off.
• The condition is met for more than 4 seconds.

1. Warm up the engine to normal operating temperature, raise the speed to 2000 rpm for 10 seconds. DTCs P0010, P0013, P0020, P0023, P2088, P2089, P2090, P2091, P2092, P2093, P2094 and P2095 must not be set.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector at the appropriate camshaft timing actuator valve.
2. Turn the ignition on, verify that the test lamp connected between the ignition circuit terminal and "weight".

• If the test lamp does not illuminate, test the ignition circuit for a short to "mass" or open/high resistance. If no faults are found during circuit testing and there is an open ignition circuit fuse, then all components connected to the ignition circuit should be checked and, if necessary, replaced.
3. Turn off the ignition, connect a test lamp between the contact of the control circuit and the supply voltage (B+).
4. Ignition ON, use a scan tool to command the camshaft control valve "incl." And "off" The control lamp should light up and go out in accordance with the given commands.
• If the control lamp is on all the time, then check for a short to "mass" control circuit. If the circuit is normal, replace the ECM.
• If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
5. Ignition ON, test for 2.0-3.0 volts between the control circuit terminal and a good ground.
• If voltage is not within the specified range, replace the ECM.
6. If no fault is found when testing all circuits/connections, test or replace the camshaft timing actuator valve.

1. Measure the resistance between the contacts of the camshaft timing control valve, which should be 7-12 ohms.
• If the resistance is not within the specified range, replace the camshaft timing control valve
2. Check the resistance between each of the contacts and the camshaft camshaft control valve body. The resistance must be infinite.
• If less resistance, replace the camshaft camshaft control valve.

• Tests P0010, P0013, P0020, P0023, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0 must pass before the ECM reports DTCs P0011, P0014, P0021, or P0024 391, P0392, P0393, P2088, P2089, P2090, P2091, P2092, P2093, P2094 and P2095.
• DTCs P0016, P0017, P0018, P0019, P0335, P0336 and P0338 do not set.
• Engine speed above 500 rpm.
• The engine must be accelerated so that the variable valve timing drive system is commanded to move from the park position to the desired phase position. This process is a camshaft control cycle. There should be 4-10 cycles of camshaft control in total with a duration of being in the phase shift position for at least 2.5 seconds in each cycle.
• The engine runs for approximately 1.8 seconds.
• DTCs P0011, P0014, P0021 and P0024 are set continuously if the above conditions are met for more than 1 second.

• The ECM detects a difference between the desired and actual camshaft angle that is greater than 5 degrees.

OR

• The ECM detects a difference between the actual and fixed camshaft angle that is greater than 1 degree.
• This condition persists for more than 4 seconds.

• The condition of the engine oil has a decisive influence on the operation of the camshaft timing control drive system.
• This DTC may be set due to low oil level. The engine may require an oil change. You can also check the value of the Engine Oil Life parameter with a scan tool (Engine oil life).
• Inspect the engine for recent mechanical repairs to the engine. Improper installation of the camshaft, camshaft timing actuator, or camshaft drive circuit can cause this DTC to appear.

Important: The engine oil level and pressure are critical to the correct operation of the camshaft timing drive system. Before proceeding with this diagnosis, it is necessary to verify that the required oil level and pressure are present.

1. Ignition ON, obtain DTC information with a scan tool. Verify that none of the following DTCs are set. DTC P0016, P0017, P0018, P0019, P0335, P0336, P0338, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, P0393, P0521, P0522 or P0523.
• If any of the listed DTCs is set, refer to the appropriate code information for further diagnosis.
2. The engine is idling. Command the suspected camshaft actuator to move from 0 to 40 degrees and back to zero while observing the appropriate CMP angle deviation parameters with a scan tool. The deviation of the CMP angle must be within 2 degrees for each position as instructed.
3. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector at the appropriate camshaft timing actuator valve.
2. Ignition ON, verify that a test lamp is off between the ignition circuit terminal and a good ground.

Important: The ignition circuit supplies voltage to other components. It is necessary to ensure that all circuits are checked for a short to "mass" and check for a short circuit all components that are included in the ignition circuit.

If the test lamp does not illuminate, test the ignition circuit for a short to "mass" or open/high resistance. If no faults are found during circuit testing and there is an open ignition circuit fuse, then all components connected to the ignition circuit should be checked and, if necessary, replaced.
3. Ignition OFF, connect a test lamp between control circuit terminal 2 and B+.
4. Ignition ON, use a scan tool to command the camshaft control valve "incl." And "off" The control lamp should light up and go out in accordance with the given commands.
• If the control lamp is on all the time, then check for a short to "mass" control circuit. If the circuit is normal, replace the ECM.
• If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
5. Remove the camshaft camshaft control valve. Inspect the camshaft camshaft control valve and installation location and check for the following faults:
• Torn, clogged, incorrectly installed or missing camshaft timing actuator valve strainers.
• Engine oil leaks at the seating surfaces of the seals of the valve for controlling the valve timing of the camshafts. Make sure that there are no scratches on the seating surfaces of the camshaft timing actuator valve.
• Oil leakage at the camshaft timing control valve connector.
• If a malfunction is found, replace the camshaft camshaft control valve.
6. If no fault is found when testing all circuits/connections, test or replace the camshaft timing actuator valve.

1. Test for a resistance of 7-12 ohms between the contacts of the camshaft timing control valve.
• If the resistance is not within the specified range, replace the camshaft timing control valve
2. Check the resistance between each of the contacts and the camshaft camshaft control valve body. The resistance must be infinite.
• If less resistance, replace the camshaft camshaft control valve.

• DTCs P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0335, P0336, P0338, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, P0393, P2088, P2089, P2090, P2091, P2092, P2093, P2094 and P2095.
• The engine has been running for more than 5 seconds.
• Engine coolant temperature within 0-95°C (32-203°F).
• Calculated engine oil temperature below 120°C (248°F).
• DTCs P0016, P0017, P0018 and P0019 are set continuously if the above conditions are met for approximately 10 minutes.

• The ECM detects one of the following faults:
• The ECM detects a misalignment between the camshaft and crankshaft positions.
• The camshaft is too far ahead of the crankshaft.
• The camshaft is too far behind the crankshaft.
• The ECM detects a difference between the actual and fixed camshaft angle that is greater than 1 degree.
• This condition persists for more than 4 seconds.

• Inspect the engine for recent mechanical repairs to the engine. This DTC can be caused by improper installation of the camshaft, camshaft actuator, camshaft sensor, crankshaft sensor, or camshaft drive circuit.
• This fault code may appear if the valve timing actuator is in the position corresponding to the maximum lead or lag.
• The presence of DTCs P0008 and P0009 together with P0016, P0017, P0018 and P0019 indicates a possible malfunction of the primary camshaft drive circuit and a mismatch between both idler sprockets and the crankshaft. It is also possible that the crankshaft pulse sensor is misaligned and does not correspond to top dead center (TDC) crankshaft.
• By comparing the desired and actual camshaft angle values with a scan tool prior to issuing a DTC, it can be determined whether the fault is related to one camshaft, one bank of cylinders, or is caused by a misalignment with the primary crankshaft.

1. Ignition ON, obtain DTC information with a scan tool. Verify that none of the following DTCs are set. DTC P0010, P0013, P0020, P0023, P0335, P0336, P0338, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, P0393, P2088, P2089, P2090, P2091, P2092, P2093, P2094 or P2095.
• If any of the listed DTCs is set, refer to the appropriate code information for further diagnosis.
2. Let the engine idle at normal operating temperature for 10 minutes. DTCs P0016, P0017, P0018 or P0019 must not be set.
• If DTCs are set, check the following:
• Correct installation of camshaft sensors.
• Correct installation of the crankshaft sensor.
• Condition of the camshaft drive chain tensioner.
• Incorrectly installed camshaft drive chain.
• Excessive free play of the camshaft drive chain.
• The camshaft drive chain is skipping teeth.
• The crankshaft pulse sensor is offset from the top dead center of the crankshaft.
3. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Ignition voltage	P0030, P0036, P0050, P0056	P0030, P0036, P0050, P0056	-	P0135, P0141, P0155, P0161
HO2S Heater Control Circuit Sensor 1	P0031, P0051	P0030, P0050	P0032, P0052	P0135, P0141, P0155, P0161
HO2S Heater Control Circuit Sensor 2	P0037, P0057	P0036, P0056	P0038, P0058	P0135, P0141, P0155, P0161

• signal circuit
• Low reference circuit
• Ignition voltage circuit
• Heater control circuit

• Ignition voltage within 10.5-18 V.
• Engine speed is above 80 rpm.
• To oxygen sensor heater (HO2S) is commanded on and off at least once per ignition cycle.
• DTCs are issued continuously if the above conditions are met for 1 second.

• Ignition voltage within 10.5-18 V.
• Engine speed is above 80 rpm.
• To oxygen sensor heater (HO2S) is commanded on and off at least once per ignition cycle.
• Control oxygen sensor (HO2S) has an operating temperature.
• DTCs are issued continuously if the above conditions are met for 1 second.

• If the fault is intermittent, move the appropriate harnesses and connectors while the engine is running while monitoring the condition of the corresponding component circuit with a scan tool. Circuit status parameter changes from OK (Correctly) or Indeterminate (Undefined) to Fault (out of order), if the condition is associated with a circuit or connector. Control Module Information (ODM) is in the module's data list.
• An open fuse in the control oxygen sensor heater circuit may be connected to a heating element in one of the sensors. This fault may not be present until the sensor has been operated for some time. If there is no fault in the heater circuit, then use a digital multimeter to check the current in each of the heaters to determine if the open in the fuse is caused by the heating element of one of the heaters. Check if the probe lead or harness is in contact with the exhaust system components.

1. Ignition OFF, disconnect the harness connector at the appropriate heated oxygen sensor (HO2S).
2. Ignition ON, verify the test lamp illuminates between the ignition circuit terminal and a good ground.

Important: The ignition circuit supplies voltage to other components. It is necessary to ensure that all circuits are checked for a short to "mass" and check for a short circuit all components that are included in the ignition circuit.

• If the test lamp does not illuminate, test the ignition circuit for a short to "mass" or open/high resistance. If no faults are found during the circuit testing and there is an open ignition circuit fuse, then all components connected to the ignition circuit 1 should be checked and replaced if necessary.
3. Ignition OFF, connect a test lamp between heater control circuit terminal and voltage "B+". The control lamp should not light up.
• If the test lamp stays on, test the control circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.

Important: The HO2S heater control circuit is connected to a voltage source inside the ECM. Normal for the control circuit is a voltage in the range of 2.0 - 3.0 volts.

4. Start the engine at idle and check if the control lamp is on continuously or flashes.
• If the test lamp remains off, test the control circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. Turn on the ignition, test for 2.0 - 3.0 volts between the contact "D" control circuits and "weight".
• If voltage is not within the specified range, replace the ECM.
6. If no problem is found on testing all circuits/connections, test or replace the HO2S.

1. Ignition OFF, disconnect the harness connector from the appropriate oxygen sensor (with electric heater) (HO2S).
2. Check the resistance of the oxygen sensor heater, which should be 3-35 ohms.
• If the resistance is not within the specified range, replace the oxygen sensor.

• signal circuit
• Low reference circuit
• Ignition voltage circuit
• Heater control circuit

• Ignition voltage within 10.5-18 V.
• Engine speed is above 80 rpm.
• To oxygen sensor heater (HO2S) is commanded on and off at least once per ignition cycle.
• DTCs are issued continuously if the above conditions are met for 1 second.

• If the fault is intermittent, move the appropriate harnesses and connectors while the engine is running while monitoring the condition of the corresponding component circuit with a scan tool. If the circuit state parameter changes from "OK" (properly) or "Indeterminate" (undefined) on "Fault" (faulty), there is a problem with the circuit or connector. Control Module Information (ODM) is in the module's data list.
• An open fuse in the control oxygen sensor heater circuit may be connected to a heating element in one of the sensors. This fault may not be present until the sensor has been operated for some time. If there is no fault in the heater circuit, then use a digital multimeter to check the current in each of the heaters to determine if the open in the fuse is caused by the heating element of one of the heaters. Check if the probe lead or harness is in contact with the exhaust system components.

• DTCs P0112, P0113, P0117, P0118 are not set.
• The engine is running.
• Ignition off for more than 10 hours.
• Engine Coolant Temperature Sensor Parameter (ECT) when starting the engine is between -30°C and +45°C (-22°F and +113°F).
• Difference between ECT sensor and intake manifold air temperature sensor (IAT) less than 8°C (14°F) when starting the engine.
• DTCs P0053 and P0059 are generated once per driving cycle if the above conditions are met.

• Warm up the engine to operating temperature. Engine running, observe the HO2S heater parameter with a scan tool. The value should vary from approximately 2 A to just over 1 A.
• With the engine running at operating temperature, observe the HO2S heater parameter with a scan tool and wiggle the related wiring and connectors.
• If the parameter changes with this exposure, repair the wiring harness or connector.

1. Ignition OFF, disconnect the harness connector at the appropriate HO2S oxygen sensor.
2. Ignition on, verify that the test lamp is lit when connected between the voltage circuit terminal "B+" and reliable mass.
• If the test lamp does not illuminate, check the voltage circuit "B+" short to ground or open/high resistance. If the circuits are good, but the fuse is blown "B+", replace the HO2S oxygen sensor.
3. Ignition OFF, verify the test lamp is OFF between the appropriate HO2S low control circuit terminal and the voltage circuit "B+".
• If the test lamp is on, test the low control circuit for a short to ground.
4. Connect a test lamp between the appropriate HO2S heater low control circuit terminal and the voltage circuit terminal "B+".
5. With the engine running, the warning lamp should be on or flashing continuously.
• If the test lamp does not illuminate or flash, test the low control circuit for a short to voltage and an open/high resistance. If the circuit is good, replace the controller.
6. Turn off the ignition, connect a jumper with a 30 A fuse between the circuit contact "B+" and the heater low control circuit on the associated HO2S oxygen sensor.
7. With the engine running, use a scan tool to verify that the appropriate HO2S heater parameter reads 0.0A.
• If the scan tool does not indicate 0.0 amps, test the circuit "B+" heater and control circuit low for a resistance greater than 3 ohms. If the circuit is good, replace the controller.
8. If all circuits test normal, replace the appropriate HO2S sensor.

• Throttle position sensor (TP).
• Intake air temperature (IAT).
• Engine revs.

• DTCs P2101 or P2119 are not set.
• The engine is running.
• DTC P0068 is set continuously when the above conditions are met.

1. Check the following:
• No cracks, kinks, and secure vacuum hose connections as shown on the vehicle emission control label.
• Check hoses carefully for leaks and blockages.
• Air leakage at the throttle body mounting area and intake manifold sealing surfaces.
2. Check the throttle body for the following faults:
• Loose or damaged throttle body.
• Broken throttle shaft.
• Any damage to the throttle body.
• If any of these conditions exist, replace the throttle body assembly.
3. Connect a scan tool and wait until the engine reaches operating temperature. Observe MAF sensor parameters.
4. Create a motor data list protocol by following the steps below.
• Start the engine at idle.
• Slowly increase engine speed to 3000 rpm, then return to idle.
• Finish creating the protocol and view the data.
• View MAF/TP sensor parameters frame by frame. The MAF/TP sensor parameters should fluctuate smoothly and continuously as the engine speed increases and returns to idle.
If the MAF/TP sensor parameters do not change continuously and smoothly as the engine speed increases and returns to idle, locate the defective sensor and replace it.

Chain	Insulation with "weight"	high resistance	Gap	Short to live wire	Signal parameters
Ignition voltage 1	P0102	P0101	P0100	-	P0101
MAF sensor signal	P0102	P0101	P0103	P0103	P0101
Low reference voltage	-	P0101, P0103	P0103	-	P0101

• The engine is running.
• Ignition 1 voltage is greater than 10.5 V.
• DTC P0100 is set continuously if the above conditions are met for more than 1 second.

• Before the ECM can set fault codes P0102 or P0103, the fault codes P0121, P0122, P0123, P0221, P0222, P0223, P0336, and P0338 must not be detected.
• The engine is running.
• Engine speed exceeds 320 rpm.
• Ignition 1 voltage is greater than 7.5 V.
• DTCs P0102 and P0103 are set continuously if the above conditions are met for less than 1 second.

• The ECM detects that the MAF sensor signal is out of range for the calculated mass air flow.
• This condition persists for 4 seconds.

• The ECM detects that the MAF sensor signal is less than -11.7 grams per second.
• This condition persists for more than 4 seconds.

• The ECM detects that the MAF sensor signal is greater than 294 grams per second.
• This condition persists for more than 4 seconds.

• Inspect the MAF sensor harness and check if it is located too close to the following components:
• Wiring or secondary windings of ignition coils
• Any solenoids
• Any relay
• Any motors
• Accelerating from a standstill with wide open throttle (WOT) should cause a rapid increase in the MAF sensor reading on the scan tool. This increase should go from 3-10g/s at idle to 150g/s or more during the 1-2 shift. If no increase is observed, then it is necessary to check if there are any obstructions to the movement of air in the intake or exhaust system.
• Check to see if the MAF sensor elements are dirty or infiltrated by water. If the sensor is dirty, clean it. If it is not possible to clean the sensor, then replace it.
• High resistance can cause poor engine performance before the DTC sets.

1. Allow the engine to idle for 1 minute and use a scan tool to obtain information on Diagnostic Trouble Codes (DTCs). Codes P0100, P0102 and P0103 must not be set.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector from the MAF sensor.

Note: DO NOT use the low test circuit at the component harness connector for this test. Damage to this control unit can lead to an increase in current.

2. Turn the ignition on, verify that the test lamp connected between the ignition circuit terminal and "weight".
• If the test lamp does not illuminate, test the ignition circuit for a short to "mass" or open/high resistance. If no faults are found during circuit testing and there is an open ignition circuit fuse, then all components connected to the ignition circuit should be checked and, if necessary, replaced.
3. Check that the control lamp is on, connected between the voltage "B+" and ground contact.
• If the test lamp does not illuminate, repair the open/high resistance in the ground circuit.
4. Verify the MAF sensor voltage is greater than 4.8 volts with a scan tool.
• If the voltage is less than the specified voltage, test the signal circuit for a short to ground. If no fault is found during circuit/connection testing, replace the ECM.
5. Connect a 3A fused jumper wire between the signal circuit terminal and the ground circuit terminal. Verify the MAF sensor voltage is less than 0.10 V with a scan tool.
• If greater than the specified voltage, test the signal circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
6. If no fault is found upon testing all circuits/connections, replace the MAF sensor.

Chain	Insulation with "weight"	high resistance	Gap	Short to live wire	Signal parameters
Ignition voltage 1	P0102	P0101	P0100	-	P0101
MAF sensor signal	P0102	P0101	P0103	P0103	P0101
Low reference voltage	-	P0101, P0103	P0103	-	P0101

• Tests P0100, P0102, P0103, P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, and P0338 must pass before the ECM reports DTC P0101.
• DTC P2176 does not set.
• Engine speed above 320 rpm.
• MAF sensor signal shows more than 11 g/s.
• The ignition voltage is greater than 10.5 volts.
• The ECM detects more than 150 crankshaft revolutions.
• DTC P0101 is set continuously if the above conditions are met for more than 2 seconds.

• The ECM detects that the MAF sensor signal is out of range for the calculated mass air flow.
• This condition persists for 4 seconds.

• Inspect the MAF sensor harness and check if it is located too close to the following components:
• Wiring or secondary windings of ignition coils
• Any solenoids
• Any relay
• Any motors
• Dirty or worn air filter element.
• Water ingress into the intake system.
• Vacuum leak.
• Leak in the brake booster.
• Malfunction in the crankcase ventilation system.
• Clogged or damaged air duct.
• Accelerating from a standstill with wide open throttle (WOT) should cause a rapid increase in the MAF sensor reading on the scan tool. This increase should go from 3-10g/s at idle to 150g/s or more during the 1-2 shift. If no increase is observed, then it is necessary to check if there are any obstructions to the movement of air in the intake or exhaust system.
• Check to see if the MAF sensor elements are dirty or infiltrated by water. If the sensor is dirty, clean it. If it is not possible to clean the sensor, then replace it.
• High resistance can cause poor engine performance before the DTC sets.

1. Allow the engine to idle for 1 minute and use a scan tool to obtain information on Diagnostic Trouble Codes (DTCs). Code P0101 should not be set.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Check the following:
• Engine vacuum leak
• Air leakage in the intake duct between the mass air flow sensor (MAF) and throttle body
• Clogged or damaged intake duct
• An object is blocking the air intake of the MAF sensor
• Clogged air filter element.
• Clogged throttle body or soot around the throttle body
• Engine oil dipstick not installed
• Loose or missing engine oil filler cap
• crankcase overflow
• If any of the above faults is found, it should be eliminated.
2. Ignition OFF, disconnect the harness connector from the MAF sensor.

Note: DO NOT use the low test circuit at the component harness connector for this test. Damage to this control unit can lead to an increase in current.

3. Turn the ignition on, verify that the test lamp connected between the ignition circuit terminal and "weight".
• If the test lamp does not illuminate, test the ignition circuit for a short to "mass" or open/high resistance. If no faults are found during circuit testing and there is an open ignition circuit fuse, then all components connected to the ignition circuit should be checked and, if necessary, replaced.
4. Check that the control lamp is on, connected between the voltage "B+" and ground contact.
• If the test lamp does not illuminate, repair the open/high resistance in the ground circuit.
5. Verify the MAF sensor voltage is greater than 4.8 volts with a scan tool.
• If the voltage is less than the specified voltage, test the signal circuit for a short to ground. If no fault is found during circuit/connection testing, replace the ECM.
6. Connect a 3A fused jumper wire between the signal circuit terminal and the ground circuit terminal. Verify the MAF sensor voltage is less than 0.10 V with a scan tool.
• If greater than the specified voltage, test the signal circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
7. If no fault is found upon testing all circuits/connections, replace the MAF sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
IAT sensor signal	P0112	P0111, P0113	P0113?	P0111
Low reference voltage	-	P0111, P0113	P0113?	P0111
? The ECM or sensor may suffer internal damage if the circuit is shorted to voltage "B+".

• The P0101 tests must pass before the ECM reports P0111 problems.
• DTCs P0112, P0113, P0116, P0117, P0118, P0119, P0125 and P0128 do not set.
• Engine coolant temperature (ECT) at start below 65.4°C (149,7°F).
• ECT temperature above 75°C (167°F).
• Vehicle speed below 10 km/h (6,3 mph).
• DTC P0111 is set continuously if the above conditions are met for more than 2 seconds.

• The P0101 tests must pass before the ECM reports P0111 problems.
• DTCs P0112, P0113, P0116, P0117, P0118, P0119, P0125 and P0128 do not set.
• Engine coolant temperature (ECT) at start below 65.4°C (149,7°F).
• Vehicle speed over 60 km/h (37,4 mph).
• MAF sensor value in the range of 11-42 g/s.
• Shutting off the fuel supply during engine braking (DFCO) not activated.
• DTC P0111 is set continuously if the above conditions are met for more than 2 seconds.

• Engine running time exceeds 3 minutes.
• The engine is idling for more than 10 seconds.
• Diagnostic checks are performed continuously when the above conditions are met.

• The ECM detects that the intake air temperature has risen by less than 4°C (7°F) when performing an idle test.
• The condition is met for 16 seconds continuously or 4 times longer than 4 seconds each. OR
• The ECM detects that the intake air temperature has risen by less than 4°C (7°F) during the speed stabilization test.
• The fault exists for more than 28 seconds or occurs more than 7 times with a duration of more than 4 seconds in each case.

• The ECM detects that the intake air temperature is above 132°C (270°F) for more than 4 seconds.

• The ECM detects that the intake air temperature is less than -42°C (-43,6°F) and deviates from this value within 3°C (5°F) with an increase in air consumption by more than 999 grams. Scan tool reading limited to -40°C (-40°F) and the diagnostic procedure uses -39°C to diagnose an intake air temperature problem (-38°F).
• This condition persists for more than 4 seconds.

• If the vehicle has been left overnight, the IAT and ECT sensor values should not differ by more than 3°C (5°F).
• A high resistance in the IAT sensor signal circuit or the IAT sensor low reference circuit can set a DTC.

1. Switch off the ignition, disconnect the MAF/IAT sensor.
2. Switch on the ignition, make sure that the parameter "IAT sensor" matters -40°C (-40°F).
• If the value is greater than -40°C (-40°F), then test the IAT sensor signal circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
3. Turn off the ignition, remove the fuse through which the voltage "B+" supplied to the ECM.

Note: DO NOT use a test light to check for an open circuit. Damage to this control unit can lead to an increase in current.

4. Test for less than 5 ohms between the low reference circuit terminal and a good ground.
• If greater than 5 ohms, test the low reference circuit for an open/high resistance, or a short to live. If no fault is found during circuit/connection testing, replace the ECM.
5. Install a fuse through which the voltage "B+" supplied to the ECM.
6. Ignition ON, connect a 3A fused jumper wire between the signal circuit terminal and the low reference circuit terminal. Verify that the IAT sensor parameter is greater than 132°C (270°F).

Important: If the IAT sensor signal circuit is shorted to a live wire, the IAT sensor may be damaged.

• If less than 132°C (270°F), test the IAT sensor signal circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
7. If no fault is found on all circuits/connections test, test or replace MAF/IAT sensor.

1. Ignition OFF, disconnect the harness connector from the IAT sensor.

Important: You can use a thermometer to test the sensor outside the vehicle.

2. Test the IAT sensor by changing its temperature while simultaneously measuring the electrical resistance of the sensor. Compare the results with the values given in the table Dependence of resistance on temperature. intake air sensor (IAT). The measured resistances should not differ from the required values by more than 5 percent.
• If the resistances differ by more than 5 percent, then the IAT sensor must be replaced.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
ECT sensor signal	P0117	P0118, P0119	P0118, P0119?	P0116?
Low reference voltage	-	P0118, P0119	P0118, P0119?	P0116?
? The ECM or ECT sensor may suffer internal damage if the circuit is shorted to voltage "B+".

ECT sensor	ECT sensor resistance	ECT signal voltage
Cold	high	high
Warm	Low	Low

• Test P0101 must pass before the ECM reports DTC P0116.
• DTCs P0117, P0118 and P0119 are not set.
• The engine run time in the previous ignition cycle was more than 10 minutes.
• The total mass of air in the previous ignition cycle exceeds 4000 grams.
• The minimum IAT temperature during the previous ignition cycle is -30°C to +2°C (-22°F... 36°F).
• When the ignition is switched on, the IAT temperature is from -30°C to 2°C (-22°F... +36°F).
• DTC P0116 is set once per ignition cycle if the above conditions are met.

• Test P0101 must pass before the ECM reports DTC P0116.
• DTCs P0117, P0118 and P0119 are not set.
• ECT temperature at previous engine shutdown was above 85°C (185°F).
• The ECM detects an expected increase in intake air temperature when the ECM power is turned off in the previous ignition cycle. A raised hood or strong wind can prevent the intake air temperature from rising.
• Block heater not detected.
• DTC P0116 is issued once per ignition cycle when the above conditions are met.

• The ECM detects that the difference between the engine coolant and intake air temperatures differs by more than 10°C when the ignition is turned on (18°F) from the difference registered during the previous ignition cycle, when all the required conditions were met.

OR

• The ECM detects that the ignition-on IAT is within the calibrated range of ECT and IAT recorded in the previous ignition cycle, but ECT is outside 30°C (54°F) from the calibrated range.
• Any of these conditions persist for more than 4 seconds.

• Test the ECT and IAT sensors at various temperature levels to determine if the sensors have a bias. An erroneous sensor reading may be the cause of a DTC or poor engine performance. Refer to Dependencies "temperature-resistance" for engine coolant temperature sensor (ECT) and for the intake air temperature sensor (IAT).
• If the vehicle has been left overnight, the IAT and ECT sensor values should not differ by more than 3°C (5°F).
• After starting a cold engine, the temperature of the ECT sensor should rise continuously and stabilize when the thermostat opens.
• High resistance in the ECT or IAT sensor circuits can cause a DTC to be set.
• A short to ground or voltage from a conductive substance or liquid can set this DTC. Inspect the ECT sensor for signs of fluid intrusion into the connector housing.

1. Verify that the following DTCs are not set: P0101, P0117, P0118 and P0119.
• If any of these codes is set, then you must refer to the information on this code.
2. Check coolant level. Check the correct functioning of the cooling system.
• If it is suspected that there is a malfunction in the cooling system, then refer to the section Part 1D1. "Engine cooling".
3. Create DTC setting conditions for the vehicle. You can also create conditions for the vehicle that have been observed in the status buffer / fault logs. DTC P0116 should not set.

1. Ignition OFF, disconnect the ECT sensor.
2. Switch on the ignition, make sure that the parameter "ECT sensor" matters -40°C (-40°F).
• If the value is greater than -40°C (-40°F), then test the ECT sensor signal circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
3. Turn off the ignition, remove the fuse through which the voltage "B+" applied to the ECM circuit terminal.

Note: DO NOT use a test light to check for an open circuit. Significant current may damage the controller.

Important: The controller or sensor may be damaged if the circuit shorts to battery positive.

4. Test for less than 5 ohms between the low reference circuit terminal and a good ground.
• If greater than 5 ohms, test the low reference circuit for an open/high resistance, or a short to live. If no fault is found during circuit/connection testing, replace the ECM.
5. Turn off the ignition, install a fuse through which the voltage "B+" applied to the ECM circuit terminal.
6. Ignition ON, connect a 3A fused jumper wire between the signal circuit and the ECT sensor low reference circuit, and verify that the parameter "ECT sensor" has a value greater than 142°C (288°F).
• If less than 143°C (289°F), test the ECT sensor signal circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
7. If no fault is found on testing all circuits/connections, test or replace the ECT sensor.

1. Ignition OFF, disconnect the engine coolant temperature sensor harness connector (ECT).

Important: You can use a thermometer to test the sensor outside the vehicle.

2. Test the ECT sensor by changing its temperature while simultaneously measuring the electrical resistance of the sensor. Compare the results with the values given in the table Dependence of resistance on temperature. intake air sensor (IAT). The measured resistances should not differ from the required values by more than 5 percent.
• If the resistances differ by more than 5 percent, then the ECT sensor needs to be replaced.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
ECT sensor signal	P0117	P0118, P0119	P0118, P0119?	P0116
Low reference voltage	-	P0118, P0119	P0118, P0119?	P0116
? The ECM or sensor may be damaged if the circuit is shorted to voltage "B+".

ECT sensor	ECT sensor resistance	ECT signal voltage
Cold	high	high
Warm	Low	Low

• The engine is running.
• Intake air temperature (IAT) at start up less than 72°C (161°F).

OR

• Initial intake air temperature (IAT) above 72°C (161°F).
• Engine run time is greater than 59 seconds.
• The diagnostic check runs continuously when the above conditions are met.

• The ignition is on or the engine is running.
• The DTC is set continuously when the above condition is met.

• The ignition is on or the engine is running.
• The DTC is set continuously when the above condition is met.

• Test the ECT sensor at various temperature levels to evaluate the possibility of a bias in the sensor. An erroneous sensor reading may be the cause of a DTC or poor engine performance. Turn to addiction "temperature-resistance" for engine coolant temperature sensor (ECT).
• If the vehicle has been left overnight, the IAT and ECT sensor values should not differ by more than 3°C (5°F).
• After starting a cold engine, the temperature of the ECT sensor should rise continuously and stabilize when the thermostat opens.
• High resistance in the ECT or IAT sensor circuits can cause a DTC to set.

1. Ignition OFF, disconnect the ECT sensor.
2. Turn on the ignition, make sure that the parameter of the ECT sensor is?40°C (?40°F).
• If the voltage is greater than the specified voltage, test the signal circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.

Note: DO NOT use a test light to check for an open circuit. Damage to this control unit can lead to an increase in current.

Important:

• The ECT sensor shares a low reference circuit with other sensors. If there is an open in the low reference circuit, which is an internal ECM circuit, a voltage of 1-5 volts can be measured in this circuit, which appeared due to replenishment through other sensors.
• The controller or sensor may be damaged if the circuit is shorted to B+.

3. Test for less than 5 V between the low reference circuit terminal and a good ground.
• If the voltage is greater than the specified range, repair the low reference circuit short to B+ and replace the ECM.
4. Turn off the ignition, remove the fuse through which the voltage "B+" supplied to the ECM.
5. Test for less than 5 ohms between the low reference circuit terminal and a good ground.
• If the resistance is greater than the specified range, test the low reference circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
6. Install a fuse through which the voltage "B+" supplied to the ECM.
7. Ignition ON, connect a 3A fused jumper wire between the signal circuit terminal and the low reference circuit terminal. Verify that the ECT sensor parameter is greater than 142°C (288°F).
• If the voltage is less than the specified range, test the signal circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
8. If no fault is found on testing all circuits/connections, test or replace the ECT sensor.

1. Ignition OFF, disconnect the engine coolant temperature sensor harness connector (ECT).

Important: You can use a thermometer to test the sensor outside the vehicle.

2. Test the ECT sensor by changing its temperature while simultaneously measuring the electrical resistance of the sensor. Compare readings with values in the table "Temperature dependence of resistance" - intake air sensor (IAT). Verify that the resistance is within 5 percent of the specified value.
• If the resistances differ by more than 5 percent, then the ECT sensor needs to be replaced.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Reference voltage 5 V	P0122, P0222, P2127	P0121, P0122, P0221, P2101, P2176	P0223, P2101, P2138, P2128, P2119	P0121, P0221
TP sensor signal 1	P0122	P0122	P0123	P0121
TP 2 sensor signal	P0222	P0222	P0223, P0638, P2128, P2138	P0221
Low reference voltage	-	P0121, P0123, P0221, P0223, P2176	P0123, P02231?	P0121, P0221
? The ECM or TP sensor may be damaged internally if the circuit is shorted to B+.

• Ignition 1 voltage is greater than 7 volts.
• TP sensor voltage 1 in the range of 0.17-4.6 V.
• DTC P0121 is set continuously if the above conditions are met.

• Ignition on, engine off or running.
• Ignition 1 voltage is greater than 7V.
• DTC P0122 is set continuously if the above conditions are met.

• Ignition 1 voltage is greater than 7 volts.
• TP 2 sensor voltage in the range of 0.15-4.8 V.
• DTC P0221 is set continuously if the above conditions are met.

1. Ignition ON, check the DTC data with a scan tool.
2. Start the engine, use a scan tool to determine the voltage for the TP 1 and 2 sensors. For the TP 1 sensor, it should be in the range of 0.17-4.6 V, and for the TP 2 sensor, in the range of 0.15-4.8 V.
3. Determine parameters for TP sensors 1 and 2 by performing the following checks:
• Quickly depress the accelerator pedal from the starting position to the wide open throttle position (WOT) and release the pedal. Repeat the procedure several times.
• Slowly depress the accelerator pedal until the throttle is fully open and then slowly return the pedal to the closed throttle position. Repeat the procedure several times. The parameter for TP sensors 1 and 2 must be set to Agree.
4. Use a scan tool to obtain information on trouble codes. DTCs P0121, P0122, P0123, P0221, P0222 and P0223 should not set.

1. Ignition OFF, disconnect the throttle body harness connector.
2. Ignition OFF, test for 5 ohms or less between the low reference circuit and "weight".
• If resistance is greater than specified, test the low reference for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
3. Turn on the ignition; using a load, test for 4.8-5.2 volts between a test lamp connected to the 5 volt reference circuit and "weight".

Important: The 5V reference circuits are internally and externally connected to the ECM. It is possible to set DTCs of other components. If other DTCs are set, refer to the wiring diagram and determine the relevant circuits and components.

• If less than 4.8 V, test the 5 V reference circuit for a short to "mass" or open/high resistance. If the circuits and connectors test normal, replace the ECM.
• If the voltage is greater than 5.2 V, test the 5 V reference circuit for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
4. Ignition on, check that the voltage of each TP sensor is less than 0.3 volts.
• If the TP sensor voltage is greater than 0.3 V, test the appropriate signal circuit for a short to live. If no fault is found during circuit/connection testing, replace the ECM.
5. Connect a 3A fused jumper wire between the 5V reference signal circuit and the signal circuit of each of the TP sensors.
6. Using a scan tool, determine the voltage of each of the TP sensors when connected to 5 volts. The voltage of both TP sensors should be 5.00 V.
• If the TP sensor voltage is less than 5.00 V, test the appropriate signal circuit for a short to "mass" or open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
7. Ignition OFF, remove the ECM fuse.

Note: DO NOT use a test light to check for an open circuit. Damage to this control unit can lead to an increase in current.

Important: The controller or sensor may be damaged if the circuit shorts to battery positive.

8. Test for 5 ohms or less between the low reference circuit and "weight".
• If greater than 5 ohms, test the low reference circuit for an open/high resistance, or a short to live. If no fault is found during circuit/connection testing, replace the ECM.
9. If no problem is found on testing all circuits/connections, test or replace the throttle body assembly.

• DTCs P0112, P0113, P0117, P0118, P0480, P0481, P0691, P0692, P0693, and P0694 are not set.
• The engine is running.

• Test P0117 must pass before the ECM reports P0128.
• DTCs P0101, P0102, P0103, P0112, P0113, P0118, P0722, or P0723 do not set.
• Engine speed above 960 rpm.
• ECT temperature below 71°C (160°F) at startup.
• Calculated outdoor temperature above -11°C (-12°F) and below 45°C (113°F).
• Vehicle speed over 15 km/h (9 mph).
• The total air consumption on the engine was more than 2000.
• DTC P0128 is set continuously if the above conditions have been met for approximately 15 minutes.

• The ECM detects that the actual coolant temperature is 10°C (18°F) less than calculated.
• This condition persists for more than 4 seconds.

1. Check engine coolant level.
• If the engine coolant level is not correct, go to Part 1D1, "Engine cooling".
2. Check that the engine coolant temperature is at normal operating temperature.
• If the coolant temperature is below normal operating temperature, then go to Part 1D1, "Engine cooling".
3. Provide the conditions required for the diagnosis. It is also possible to provide the conditions recorded in the status/fault log data records. DTCs P0125 or P0128 should not set.
4. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector from the ECT sensor.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit and "weight".
• If greater than 5 ohms, test the low reference circuit for a short to live or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. Ignition ON, use a scan tool to check if the ECT sensor parameter is -40°C (-40°F).
• If more than -40°C (-40°F), then check the signal circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.

Important: If the ECT sensor signal circuit is shorted to a live wire, the ECT sensor may be damaged.

4. Connect a 3A fused jumper wire between the signal circuit and the low reference circuit. Make sure the parameter "ECT sensor" has a value greater than 128°C (262°F).
• If less than 128°C (262°F), test the signal circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. If all circuits test normal, test or replace the ECT sensor.

1. Ignition OFF, disconnect the harness connector from the ECT sensor.

Important: Important: You can use a thermometer to test the sensor outside the vehicle.

2. Test the ECT sensor by changing its temperature while simultaneously measuring the electrical resistance of the sensor. Compare the results with the values given in the table Dependence of resistance on temperature. intake air sensor (IAT). The measured resistances should not differ from the required values by more than 5 percent.
• If the resistances differ by more than 5 percent, then the ECT sensor needs to be replaced.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
HO2S signal bank 1 sensor 1	P0131	P0130, P0134	P0132	P0130, P0133
HO2S signal bank 2 sensor 1	P0137	P0136, P0140	P0138	P0136, P0139
HO2S signal bank 2 sensor 1	P0151	P0150, P0154	P0152	P0150, P0153
HO2S signal bank 2 sensor 2	P0157	P0156, P0160	P0158	P0156, P0159
Low reference voltage	-	P0130, P0136, P0150, P0156	P0134, P0140, P0154, P0160	-

• Ignition voltage within 10-16 V.
• The engine is running.

1. Engine idling, determine the voltage for the appropriate HO2S sensor The value should fluctuate up and down between 350-550 mV.
2. If the vehicle passes the test "Circuit/System Testing", you should test the vehicle under the conditions of the DTC. It is also possible to test the vehicle under the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
2. Ignition on, check that the HO2S parameter is in the range of 350-500 mV.
• If less than 350 mV, test the signal circuit for a short to "mass". If the circuits and connectors test normal, replace the ECM.
• If the voltage is greater than 500 mV, test the signal circuit for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
3. Ignition OFF, test for 5 ohms or less between the HO2S low reference circuit and "weight".
• If greater than 5 ohms, test the low reference circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
4. Connect a 3 A fused jumper wire between the signal circuit and the HO2S low reference circuit, and test the HO2S parameter for less than 60 mV.
• If greater than 60 mV, test the signal circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. If no problem is found on testing all circuits/connections, replace the HO2S.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
HO2S signal bank 1 sensor 1	P0131	P0130, P0134	P0132	P0130, P0133
HO2S signal bank 2 sensor 1	P0137	P0136, P0140	P0138	P0136, P0139
HO2S signal bank 2 sensor 1	P0151	P0150, P0154	P0152	P0150, P0153
HO2S signal bank 2 sensor 2	P0157	P0156, P0160	P0158	P0156, P0159
Low reference voltage	-	P0130, P0136, P0150, P0156	P0134, P0140, P0154, P0160	-

• Ignition voltage within 10-16 V.
• The engine is running.

1. Engine idling, determine voltage for HO2S sensor Voltage should fluctuate up and down between 350-550 mV.
2. If the vehicle passes the test "Circuit/System Testing", you should test the vehicle under the conditions of the DTC. It is also possible to test the vehicle under the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
2. Ignition on, verify that the HO2S voltage is between 350-500mV.
• If less than 350 mV, test the signal circuit for a short to "mass". If the circuits and connectors test normal, replace the ECM.
• If the voltage is greater than 500 mV, test the signal circuit for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
3. Ignition OFF, test for 5 ohms or less between the low reference circuit and "weight".
• If greater than 5 ohms, test the low reference circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
4. Connect a 3 A fused jumper wire between the signal circuit and the low reference circuit of the sensor and test the HO2S voltage for less than 60 mV.
• If greater than 60 mV, test the HO2S signal circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. Check that the following conditions are not present:
• Lean mixture on fuel injectors
• Low pressure in the fuel system
• Fuel contaminated
• Exhaust leak near HO2S oxygen sensor
• Engine vacuum leak
• If any of the above faults is found, it should be eliminated.
6. If no problem is found on testing all circuits/connections, replace the HO2S.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
HO2S signal bank 1 sensor 1	P0131	P0130, P0134	P0132	P0130, P0133
HO2S signal bank 2 sensor 1	P0137	P0136, P0140	P0138	P0136, P0139
HO2S signal bank 2 sensor 1	P0151	P0150, P0154	P0152	P0150, P0153
HO2S signal bank 2 sensor 2	P0157	P0156, P0160	P0158	P0156, P0159
Low reference voltage	-	P0130, P0136, P0150, P0156	P0134, P0140, P0154, P0160	-

• Ignition voltage within 10-16 V.
• The engine is running.

1. Engine idling, determine voltage for HO2S sensor Voltage should fluctuate up and down between 350-550 mV.
2. If the vehicle passes the test "Circuit/System Testing", you should test the vehicle under the conditions of the DTC. It is also possible to test the vehicle under the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
2. Ignition on, verify that the HO2S voltage is between 350-500mV.
• If less than 350 mV, test the signal circuit for a short to "mass". If the circuits and connectors test normal, replace the ECM.
• If the voltage is greater than 500 mV, test the signal circuit for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
3. Ignition OFF, test for 5 ohms or less between the low reference circuit and "weight".
• If greater than 5 ohms, test the low reference circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
4. Connect a 3 A fused jumper wire between the signal circuit and the low reference circuit of the sensor and test the HO2S voltage for less than 60 mV.
• If greater than 60 mV, test the signal circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. Check that the following conditions are not present:
• Lean mixture at the fuel injector
• High pressure in the fuel system
• Fuel contaminated
• Interference in the exhaust system
• If any of the above faults is found, it should be eliminated.
6. If no problem is found on testing all circuits/connections, replace the HO2S.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
HO2S signal bank 1 sensor 1	P0131	P0130, P0134	P0132	P0130, P0133
HO2S signal bank 2 sensor 1	P0137	P0136, P0140	P0138	P0136, P0139
HO2S signal bank 2 sensor 1	P0151	P0150, P0154	P0152	P0150, P0153
HO2S signal bank 2 sensor 2	P0157	P0156, P0160	P0158	P0156, P0159
Low reference voltage	-	P0130, P0136, P0150, P0156	P0134, P0140, P0154, P0160	-

• Ignition voltage within 10-16 V.
• The engine is running.

1. Verify that no other DTCs are set.
• If any of the codes is set, then you need to refer to the information on this code.
2. Engine idling, detect voltage for HO2S sensor Voltage should fluctuate above and below the 350-550 mV range.
3. Ensure the operating conditions of the vehicle required for diagnostics. DTCs P0133 and P0153 should not set.
4. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Check for the following faults:
• Lean mixture on fuel injectors
• Water ingress into the HO2S harness connector
• Damaged HO2S harness
• Wrong RTV seal
• Low or high pressure in the fuel system
• Fuel contaminated
• Fueling the EVAP adsorber
• Exhaust leak near HO2S oxygen sensor
• Engine vacuum leak
• Engine oil consumption
• Engine coolant consumption
• If any of the above faults is found, it should be eliminated.
2. If none of these faults are present, replace the associated HO2S.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Ignition voltage 1	P0135, P0141	P0135, P0141	-	-
HO2S 1 Heater Control Circuit	P0135	P0135	P0135	-
HO2S 2 Heater Control Circuit	P0141	P0141	P0141	-

• Ignition voltage within 10-16 V.
• The engine is running.

Important: It may take up to 8 minutes for the DTC to set.

1. After warming up the engine to normal operating temperature, raise the speed above 1200 rpm for 30 seconds, and then let the engine idle. DTCs P0135, P0141, P0155, or P0161 should not set.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector from the affected HO2S.
2. Ignition ON, test under load for battery voltage on the HO2S heater ignition voltage circuit.
• If less than B+, repair the HO2S heater ignition voltage circuit for a short to "mass" or open/high resistance.
3. Ignition OFF, connect a test lamp between the HO2S heater control circuit terminal and B+.
• If the test lamp is on, test the HO2S heater control circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
4. Ignition ON, test for less than 0.3 volts between the HO2S heater control circuit at the test lamp connection point and "weight".
• If greater than 0.3 volts, test the HO2S heater control circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. If no problem is found on testing all circuits/connections, test or replace the HO2S.

1. Ignition OFF, disconnect the harness connector from the affected HO2S.
2. Check the resistance of the oxygen sensor heater, which should be 3-35 ohms.
• If the resistance is not within the specified range, then replace the HO2S.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
HO2S signal bank 1 sensor 1	P0131	P0130	P0132	P0130, P0133, P0134
HO2S signal bank 2 sensor 1	P0137	P0136	P0138	P0136, P0139, P0140
HO2S signal bank 2 sensor 1	P0151	P0150	P0152	P0150, P0153, P0154
HO2S signal bank 2 sensor 2	P0157	P0156	P0158	P0156, P0159, P0160
Low reference voltage	-	P0130, P0136, P0150, P0156	P0132, P0138, P0152, P0158	-

• Ignition voltage within 10-16 V.
• The engine is running.

1. With the engine running, measure the voltage of the oxygen sensor with electric heater (HO2S). The value should fluctuate up and down in the range of 350-550 mV.
2. If the vehicle passes the test "Circuit/System Testing", you should test the vehicle under the conditions of the DTC. It is also possible to test the vehicle under the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector from the affected HO2S.
2. Ignition on, check that the HO2S parameter is in the range of 350-500 mV.
• If less than 350 mV, test the HO2S signal circuit for a short to "mass". If the circuits and connectors test normal, replace the ECM.
• If greater than 500 mV, test the HO2S signal circuit for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
3. Ignition OFF, test the resistance between the HO2S low reference circuit and "weight", which must be less than 5 ohms.
• If greater than 5 ohms, test the HO2S low reference circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
4. Connect a 3 A fused jumper wire between the signal circuit and the HO2S low reference circuit, and test the HO2S parameter for less than 60 mV.
• If greater than 60 mV, test the HO2S signal circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. Check that the following conditions are not present:
• Lean mixture on fuel injectors
• Low pressure in the fuel system
• Fuel contaminated
• Exhaust leak near HO2S oxygen sensor
• Engine vacuum leak
• If any of the above faults is found, it should be eliminated.
6. If no problem is found on testing all circuits/connections, replace the HO2S.

• The engine has been running for more than 10 seconds.
• This DTC is issued continuously when the conditions for issuing are met.

1. Switch on ignition, engine off.
2. Disconnect the EOT sensor harness connector.
3. Measure the voltage at the EOT sensor harness connector, which should be between 4.9-5.2V.
• If the voltage is less than 4.9 V, test the EOT sensor circuit for a short to ground or an open/high resistance.
• If the voltage is greater than 5.2 V, test the EOT sensor circuit for a short to voltage.
• If the EOT sensor circuit is OK and the voltage is not within the specified range, replace the ECM.
4. Connect a 3A fused jumper wire between the EOT sensor signal circuit and the low reference circuit.
• Observe sensor parameters by connecting and disconnecting the jumper between the EOT sensor signal circuit and the low reference circuit.
• The EOT sensor value should switch between upper and lower limits.
• If the EOT signal does not switch between high and low limits, replace the ECM.
• If the EOT signal switches between high and low limits, replace the EOT sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Ignition voltage 1	P0201, P0202, P0203, P0204, P0205, P0206	P0201, P0202, P0203, P0204, P0205, P0206	-	-
Injector 1 control circuit	P0261	P0201	P0262	-
Injector 2 control circuit	P0264	P0204	P0265	-
Injector 3 control circuit	P0267	P0203	P0268	-
Injector 4 control circuit	P0270	P0204	P0271	-
Injector 5 control circuit	P0273	P0205	P0274	-
Injector 6 control circuit	P0276	P0206	P0277	-

• Engine speed is above 80 rpm.
• Ignition voltage 1 in the range of 10-18 V.
• Diagnostic checks are performed continuously when the above conditions are met.

1. Obtain current misfire counters using a scan tool. The current misfire counters should not increment.
2. With the engine running, observe the DTC information with a scan tool. DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276 and P0277 should not set.

Important: Disconnecting the multi-pin harness connector will generate DTCs P0201-P0206 (open fuel injector circuit).

1. Ignition OFF, disconnect the fuel injector harness multi connector.
2. Ignition ON, test for voltage between the ignition 1 voltage circuit and battery positive, which should be less than 0.1 volts.

Important: The ignition circuit supplies voltage to other components. It is necessary to ensure that all circuits are checked for a short to "mass" and check for a short circuit all components that are included in the ignition circuit.

• If the voltage is greater than 0.1 V, repair the fuel injector ignition 1 voltage circuit for a short to "mass" between the fuel injector and the fuse. Or, test for an open/high resistance between the multi-pin connector and B+. Replace fuse if required.
3. Connect a test lamp between the appropriate injector control circuit harness multi connector terminal on the ECM side and B+.
4. Turn the engine with a starter, the control lamp should flash.
• If the test lamp stays on, test the control circuit for a short to "mass". If the circuit/connectors are OK, replace the ECM.
• If the test lamp does not illuminate at all, test the control circuit for a short to voltage or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. Ignition ON, measure the voltage between the fuel injector control circuit (multi-pin controller side) And "weight", which should be equal to 2.6 - 4.6 V.
• If the voltage is not within the specified range and no fault is found during circuit/connection testing, replace the ECM.
6. Remove upper intake manifold.
7. Disconnect the fuel injector connectors.
8. Check resistance between circuit (-ami) ignition 1 voltage and the corresponding injector control circuit, on the injector side of the multi-pin harness connector. The DMM should show an overload.
• If less resistance, repair the short between the ignition 1 voltage circuit and the appropriate fuel injector control circuit.
9. Using a DMM, measure the resistance of the appropriate ignition 1 voltage circuit between the (-ami) injector and multi-pin connector, which must be less than 1 ohm.
• If greater than 1 Ω, repair the open/high resistance in the ignition 1 voltage circuit.
10. Measure the resistance of the control circuit, which may be faulty; the resistance between the injector connector and the multi-pin connector must be less than 1 ohm.
• If greater than 1 Ω, repair the open/high resistance in the fuel injector control circuit.
11. Measure the resistance between the appropriate fuel injector control circuit and "weight". The DMM should show an overload.
• If the resistance is less, then eliminate the short to "mass" in the fuel injector control circuit.
12. Measure the resistance between the fuel injector control circuit that may be malfunctioning and all other fuel injector control circuits. The DMM should show an overload.
• If the resistance for any pair of circuits is less, then eliminate the short circuit of the wires of these circuits.
13. If no fault is found when testing all circuits/connections, test or replace fuel injector (-And).

1. Measure the resistance between the contacts of the fuel injector, which should be 12-16 ohms.
• If the resistance is not within the specified range, replace the fuel injector.

• The car is equipped with a manual transmission.
• The engine is running.
• Ignition voltage within 10-16 V.

• An over-revving situation can only occur if the manual gearbox is in low gear while the vehicle is traveling at high speed on the road. This DTC cannot be set by arbitrarily increasing the engine speed.

1. Start the engine, test the car in normal driving conditions. DTC P0219 should not set.

1. If no other DTCs are set. Use a scan tool to clear this DTC. Test the vehicle under the conditions for setting this DTC.
• If this DTC is set again, replace the ECM.

• DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, or P0338 are not set.
• The engine speed is in the range of 400 - 7000 rpm and is constant.
• Engine running time exceeds 45 seconds.
• Received torque signal at idle is greater than 10 percent.
• The received torque signal is in the range of 9-30 percent when in gear.
• Intake air temperature (IAT) above -30°C (-22°F).
• The A/C compressor clutch does not change state.
• There is no torque control.
• Anti-lock braking system / traction control system (ABS/TCS) are not functioning.
• The ECM is not receiving a rough road signal.
• Fuel level over 12 percent.
• The ECM is not in Normal Fuel Cut or Deceleration Fuel Cut.
• The throttle angle does not change.
• DTC P0300 is set continuously if the above conditions are met for at least 1000 engine revolutions.

• Tire or wheel is out of round or out of balance
• Variable thickness brake rotors
• Unbalanced propeller shaft
• Certain conditions on a bad road
• Damaged drive belt or accessory

1. The engine is idling at normal operating temperature.
• If abnormal engine noise is detected, refer to Part 1C2, "The mechanical part of the HFV6 3.2 L engine.»
2. Verify that DTCs P0011, P0014, P0021, P0024, P0201-P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P03 35, P0336, P0338, P0351 -P0356, P2088, P2090, P2092, P2094, P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, or P2316 are not installed.
• If any of these codes is set, then you must refer to the information on this code.
3. Use a scan tool to obtain current misfire data on cylinders 1-6. The current misfire counters should not increment.
4. Engine idling, perform a cylinder power balance check with a scan tool to identify the cylinder that is misfiring. The engine speed should change as each injector is turned off.

1. Check that the following conditions are not present:
• Cracked, kinked or loose vacuum hose connections
• Engine vacuum leak
• Crankcase ventilation system for vacuum leak
• Low or high pressure in the fuel system
• Fuel contaminated
• Interference in the exhaust system
• If any of the above faults is found, it should be eliminated.
2. Switch off the ignition, remove the ignition coil of the misfire cylinder, but do not disconnect the electrical connector.
3. Inspect the ignition coil boot, checking for the following faults:
• holes
• Tears
• Soot tracks
• oiling
• water ingress
• If any of the above faults is found, it should be eliminated.
4. Remove the fuel pump fuse from the fuse box.
5. Install a spark plug tester on the spark plug.

Important: Faults in sparking or a weak spark are regarded as no spark.

6. Start the engine, observing the readings of the tester. The spark tester should spark
• If there is no spark, then check the resistance of the spark plug wire, which should be 1000 ohms at 31 cm (per 1 foot). Replace the wire if the resistance is greater.
7. Switch off the ignition, remove the spark plug from the misfiring cylinder. Check the spark plug to make sure the following are not present:
• Fuel, coolant or oil contamination
• Cracks, wear, incorrect clearance
• If any of these problems are found, replace the spark plug.
8. Change the spark plug that is suspected to be faulty to another cylinder that is working properly.
9. While the engine is idling, use a scan tool to obtain current misfire data. Misfiring should not occur in the cylinder in which this spark plug is repositioned.
• If misfiring does occur, replace that spark plug.
10. If all these faults are absent, then check the following:
• Lean or rich mixture at the fuel injector
• Engine mechanical defects

1. If the customer has reported a flashing fault indicator lamp (MIL), see section "Diagnostic Trouble Codes".
2. Clear the DTCs with a scan tool.
3. Switch off the ignition for 30 seconds.
4. Start the engine.
5. Create conditions for the vehicle to generate a DTC. You can also create conditions for the vehicle that have been observed based on the recorded disturbance data.
• If the DTC was set again on this ignition, the misfiring will still continue.

• Before the ECM reports DTCs P0327, P0328, P0332, or P0333, DTCs P0324, P0335, P0336, and P0338 must pass.
• DTCs P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392 and P0393 do not set.
• The ECM controls the ignition.
• Coolant temperature (ECT) above 60°C (140°F).
• The engine speed is stable and above 2000 rpm.
• The volumetric efficiency is stable.
• DTCs P0327, P0328 P0332 and P0333 are set continuously if the above conditions are met for approximately 20 seconds.

• Check for physical damage to the knock sensor. A sensor that has been dropped or damaged can cause a DTC to set.
• Check if the KS sensor is installed correctly. A sensor that is loose or too tight can cause a DTC to set. There must be no traces of thread sealant on the KS sensor. The mounting surface of the sensor must be free of burrs, casting burrs and foreign materials.
• The sensor must not come into contact with hoses, brackets and engine wiring.
• Normally, the signal voltage of the disconnected sensor is 0.25 V.

1. Start the engine. Use a scan tool to obtain information on trouble codes. DTCs P0324, P0327, P0328, P0332, or P0333 should not set.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the relevant KS sensor harness connector.
2. Ignition ON, connect a test lamp between the sensor signal circuit and the negative battery terminal.
• If the test lamp is on, test the signal circuit for a short to live. If no fault is found during circuit/connection testing, replace the ECM.
3. Ignition ON, connect a test lamp between the sensor signal circuit and the positive battery terminal.
• If the test lamp is on, test the signal circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
4. Ignition OFF, measure the resistance between the KS sensor low reference circuit and "weight", which must be less than 5 ohms.
• If the resistance is greater than the specified value, test the low reference circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. If no fault is found on testing all circuits/connections, replace the KS.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
CKP sensor signal	P0335	P0335	P0335	P0336
Low reference voltage	-	P0335	P0335, P0338	P0336
shielded wire "masses"	-	-	-	P0336

• The engine is cranked by the starter or running.
• The ECM has registered more than 12 camshaft revolutions.
• Diagnostic checks are performed continuously when the above conditions are met.

• Physical damage to the CKP sensor or encoder.
• Excessive play or looseness of CKP sensor or encoder.
• Incorrect installation of the CKP sensor or encoder.
• The appearance of foreign material between the CKP sensor and the encoder.
• Excessively large gap between CKP sensor and encoder.
• The ECM uses the camshaft position sensors to detect engine speed and crankshaft position in the event of a crankshaft sensor failure.
• The engine will only run with a bad CKP sensor if the ECM has stored the previously determined camshaft home positions. In the event of a malfunction of the crankshaft position sensor, the engine will go into emergency operation after a difficult start. The ECM then calculates engine RPM from one of the camshaft position sensors. In emergency mode, it is also possible to set the following additional diagnostic codes, which should be ignored:
• DTC P0324 Knock Sensor Module Performance.
• DTC P1011 Intake Camshaft Timing Actuator Neutral Position Bank 1
• A CKP sensor DTC may be set due to an intermittent fault in the camshaft position sensor circuits (CMP). If the indicated fault is suspected, the CMP sensor, harness connections, and associated wiring should be inspected.

1. Ignition ON, check the DTC data with a scan tool. Attempt to start the engine, use a scan tool to obtain information on diagnostic trouble codes. Codes P0335, P0336 and P0338 should not be set.
2. Move the CKP sensor harnesses/connections while observing the operation of the engine, which at this time should not jerk, stall or change speed.
3. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

Important: If the CKP sensor lead is damaged in any way, replace the sensor.

1. Ignition OFF, disconnect the harness connector from the crankshaft position sensor (CKP).
2. Ignition ON, test for 2.0-3.0 V on the signal circuit and on the CKP sensor low reference circuit.
• If less than 2.0 V, test the appropriate circuit for a short to voltage "mass" or open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
• If more than 3.0 V, test the appropriate circuit for a short to live. If no fault is found during circuit/connection testing, replace the ECM.
3. Ignition OFF, measure the resistance between the ground shield circuit of the CKP sensor connector and "weight", which should be 5 ohms.
• If greater than 5 ohms, repair the open/high resistance in the CKP sensor shield circuit.
4. Disconnect the ECM connectors, measure the resistance between the following circuits:
• CKP signal circuit and CKP low reference circuit.
• CKP signal circuit and ground shield circuit.
• CKP low reference circuit and ground shield circuit.
For all circuits, the DMM should show an overload.
• If there is continuity between any of these circuits, repair the short in the wires in those circuits.
5. If no problem is found when testing all circuits/connections, test or replace the CKP sensor.

1. Ignition OFF, disconnect the harness connector from the crankshaft position sensor (CKP).

Important: If the CKP sensor lead is damaged in any way, replace the sensor.

2. Connect a digital multimeter between the signal circuit and the low reference circuit of the CKP sensor.
3. Measure the resistance between the signal circuit and the low reference circuit, which should be 700-1200 ohms.
• If the resistance is not within the specified range, replace the CKP sensor.
4. Switch the DMM to measure AC voltage.
5. Measure the resistance between the signal circuit and the low reference circuit, which should be 700-1200 ohms.
• If less than 1.4 V a.c. current, then replace the CKP sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Reference voltage 5 V of the CMP sensor	P0343, P0348, P0368, P0393	P0343, P0348, P0368, P0393	-	P0341, P0346, P0366, P0391
CMP sensor signal, intake, bank 1	P0342	P0343	P0343	P0341
CMP sensor signal, intake, bank 2	P0347	P0348	P0348	P0346
CMP sensor signal, exhaust, bank 1	P0367	P0368	P0368	P0366
CMP sensor signal, exhaust, bank 2	P0392	P0393	P0393	P0391
Low reference voltage	-	P0343, P0348, P0368, P0393	-	P0341, P0346, P0366, P0391

• Engine running for more than 1 second.
• Diagnostic checks are performed continuously when the above conditions are met.

• Physical damage to the CMP sensor or encoder.
• Inadmissible play or looseness in the CMP sensor or chopper gear.
• Incorrect installation of CMP sensor or chopper gear.
• Foreign material between CMP sensor and encoder.
• Invalid clearance between CMP sensor and chopper gear.

1. Ignition OFF, remove the ECM fuse/relay that supplies voltage "B+" applied to the controller contact.
2. Disconnect the harness connector from the appropriate CMP sensor.

Note: DO NOT use a test light to check for an open circuit. Damage to this control unit can lead to an increase in current.

Important: The controller or sensor may be damaged if the circuit is shorted to B+.

3. Test for 5 ohms or less between the low reference circuit and a good ground.
• If greater than 5 ohms, test the low reference circuit for an open/high resistance, or a short to live. If no fault is found during circuit/connection testing, replace the ECM.
4. Install an ECM fuse that provides voltage "B+" supplied to the ECM.
5. Ignition ON, measure the voltage between the 5 V reference circuit of the CMP sensor and a good ground, which should be 4.8 - 5.2 V.
• If less than 4.8 V, test the 5 V reference circuit for a short to "mass" or open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
• If more than 5.2 V, test the 5 V reference circuit for a short to live. If no fault is found during circuit/connection testing, replace the ECM.
6. Use a digital multimeter to measure the voltage between the CMP sensor signal circuit and a good ground, which should be between 4.8 and 5.2 volts.
• If greater than 5.2 V, test the CMP sensor signal circuit for a short to a live wire. If no fault is found during circuit/connection testing, replace the ECM.
• If less than 4.8 V, test the CMP sensor signal circuit for a short to "mass" or open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
7. If no fault is found on testing all circuits/connections, replace the CMP.

• The engine is running.
• The ignition voltage 1 is in the range of 10.5 - 18 volts.
• The engine speed is in the range of 1400 - 5000 rpm.
• Diagnosis is performed continuously as soon as the above conditions are met for more than 1 second.

1. Ignition on, disconnect the harness connector from the appropriate ignition coil.
2. Ignition ON, verify that a test lamp is off between the ignition circuit terminal and a good ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to "mass" or open/high resistance. If no fault is found during the circuit test and there is an open in the ignition circuit fuse, test the circuit contact for a short to "mass".
3. For this test, you must switch the DMM to measure AC frequency.
4. Crank or start the engine, measure the frequency between the appropriate ignition control circuit and a good ground; the frequency must be greater than 3 Hz.
• If the frequency is less than 3 Hz, test the ignition control circuit for a short to live, for a short to "mass" and open / high resistance. If no fault is found during the circuit/connection test, replace the ECM.
5. Measure the resistance between both ground circuits of the ignition coil connector and the ECM case, which should be less than 5 ohms.
• If resistance is greater than 5 ohms, test the ground circuits for an open or high resistance. If no fault is found during circuit/connection testing, replace the ECM.
6. If no fault is found when testing all circuits/connections, replace the ignition coil.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Ignition voltage 1	P0261, P0264, P0267, P0270, P0273, P0276, P0300-P0306	P0300-P0306	-	P0300-P0306
Ignition coil control circuit 1	P2300	P0351	P2301	P0300, P0301
Ignition coil 2 control circuit	P2303	P0352	P2304	P0300, P0302
Ignition coil control circuit 3	P2306	P0353	P2307	P0300, P0303
Ignition coil control circuit 4	P2309	P0354	P2310	P0300, P0304
Ignition coil control circuit 5	P2312	P0355	P2313	P0300, P0305
Ignition coil control circuit 6	P2315	P0356	P2316	P0300, P0306

• The engine is running.
• The ignition voltage 1 is in the range of 10.5 - 18 volts.
• The engine speed is in the range of 1400 - 5000 rpm.
• Diagnosis is performed continuously as soon as the above conditions are met for more than 1 second.

1. Ignition on, disconnect the harness connector from the appropriate ignition coil.
2. Turn the ignition on, verify that the test lamp connected between the ignition circuit terminal and "weight".
• If the test lamp does not illuminate, test the ignition circuit for a short to "mass" or open/high resistance. If no fault is found during the circuit test and there is an open in the ignition circuit fuse, test the circuit contact for a short to "mass".
3. For this test, you must switch the DMM to measure AC frequency.
4. Crank the starter or start the engine, measure the frequency between the appropriate ignition control circuit and "weight"; the frequency must be greater than 3 Hz.
• If the frequency is less than 3 Hz, test the ignition control circuit for a short to live, for a short to "mass" and open / high resistance. If no fault is found during the circuit/connection test, replace the ECM.
5. Measure the resistance between both ground circuits of the ignition coil connector and the ECM case, which should be less than 5 ohms.
• If resistance is greater than 5 ohms, test for an open or high resistance in the ground circuits. If no fault is found during circuit/connection testing, replace the ECM.
6. If no fault is found when testing all circuits/connections, replace the ignition coil.

• The amount of oxygen stored in the catalyst exceeds a predetermined threshold, which is determined by the signal from the diagnostic oxygen sensor.
• The diagnostic oxygen sensor indicates that the catalyst is fully saturated with oxygen, as determined by the signal from the diagnostic sensor.

• Before the ECM can set fault codes P0420 or P0430, it is necessary that fault codes P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0053, P0056, P0057, P0058, P0059, P0101, P0102, P0103, P0121, P0122, P0123, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P0140, P0141, P0150, P0151, P0152, P0153, P0155, P0 157, P0158, P0160, P0161, P0221, P0222, P0223, P0335, P0336, P0338, P167A, P167B, P2096, P2097, P2098, P2099, P2195, P2196, P2197, P2198, P2232, P2235, P2237, P2240, P2243, P2 247, P2251, P2254, P2270, P2271, P2272, P2273, P2297, P2298, P2626, and P2629.
• DTCs not set P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0053, P0056, P0 057, P0058, P0059, P0101, P0102, P0103, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0125, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P0140, P0141, P0150, P0 151, P0152, P0153, P0155, P0157, P0158, P0160, P0161, P0221, P0222, P0223, P0300, P0301-P0306, P0443, P0458, P0459, P0496, P167A, P167B, P2088, P2089, P2090, P2091, P2092, P2 093, P2094, P2095, P2096, P2097, P2098 P2099 P2100 P2101 P2107 P2119 P2122 P2123 P2127 P2128 P2138 P2176 P2177 P2178 P2179 P2180 P2187 P2188 P2189 P2190 P2 195, P2196, P2197, P2198, P2232, P2235, P2237, P2240, P2243, P2247, P2251, P2254, P2270, P2271, P2272, P2273, P2297, P2298, P2626 and P2629
• The engine speed is in the range of 1040 - 3000 rpm.
• The flow rate of air entering the engine is in the range of 7 - 16 g/s and does not change by more than 3 g/s.
• Intake air temperature (IAT), entering the engine at start-up exceeds -30°C (-22°F).
• The engine has been running for more than 7 minutes.
• The engine is running in closed loop mode.
• The calculated temperature of the catalytic converter is in the range of 500-750°C (932-1382°F) and constant.
• The above conditions exist for approximately 17 minutes.
• The diagnostic checks associated with DTCs P0420 and P0430 are performed once per drive cycle. The ECM will attempt this diagnostic up to 3 times per driving cycle.

• Misfire
• High oil or coolant consumption
• Ignition advance reduction
• Weak spark
• lean air-fuel mixture
• Enriched air-fuel mixture
• Damaged oxygen sensor or wiring harness

1. Verify that DTCs related to oxygen sensors or misfires are not set.
• If DTCs related to oxygen sensors or misfiring are set, refer to the appropriate code information to determine the cause of the problem before performing this diagnostic procedure.
2. Check if the corresponding catalytic converter has the following faults:
• dents
• Very strong discoloration caused by excessively high temperatures.
• road damage
• Chattering of internal elements caused by damage to the catalyst substrate.
• Internal obstructions to the movement of gases
• If any of the faults are found, the corresponding catalytic converter should be replaced.
3. Check if the exhaust system has the following faults:
• Leaks
• physical damage
• Loose or missing structural elements
• Badly tightened oxygen sensor
• If any malfunction is found, repair the exhaust system.
4. Check if the HO2S2 oxygen sensor has the following problems:
• Wire Harness Grounding
• Damage
• If any of the faults are found, the corresponding HO2S2 oxygen sensor should be replaced.
5. If no physical problems are found, and after running the engine at 1500 rpm for 1 minute and then returning to a stable idle, the HO2S 2 signal is the same as the HO2S 1 signal, the catalytic converter should be replaced.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Ignition voltage 1	P0458	P0443	-	-
EVAP canister purge valve control circuit	P0458	P0443	P0459	-

• The ignition is on or the engine is running.
• Engine speed over 80 rpm
• The ignition voltage 1 is in the range of 10.5 - 18 volts.
• The ECM will command the EVAP canister purge valve on and off at least once per ignition cycle.
• Diagnostic checks are performed continuously when the above conditions are met.

1. Ignition ON, use a scan tool to command the EVAP purge valve "incl." And "off" A click should be heard.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the EVAP purge valve harness connector at the purge valve.
2. Ignition ON, verify that a test lamp is off, connected between the ignition 1 voltage circuit and "weight".
• If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to "mass" or open/high resistance. If no fault is found on the circuit and the ignition 1 voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary.
3. Connect a test lamp between the control circuit terminal and the ignition 1 voltage circuit terminal.
4. Use a scan tool to command the EVAP purge valve "incl." And "off" The control lamp should light up and go out in accordance with the given commands.
• If the test lamp stays on, test the control circuit for a short to "mass". If no fault is found during the circuit test, replace the ECM.
• If the test lamp remains off, test the control circuit for a short to live or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
5. If no fault is found when testing all circuits, test or replace the EVAP purge valve.

1. Ignition OFF, disconnect the harness connector at the EVAP purge valve. Measure the resistance between the control circuit and the ignition 1 voltage circuit of the purge valve. This resistance should be 24-28 ohms.
• If the resistance is not within the specified range, replace the EVAP purge valve.
2. Test for infinite resistance between each of the EVAP purge valve contacts and the purge valve body.
• If the resistance is less, replace the EVAP purge valve.

• FTP sensor signal voltage not in calibrated range at cold start.
• The FTP sensor signal does not change by the calibrated value during the purge process.
• FTP sensor signal fluctuates more than calibrated amount when vehicle speed is less than 30 km/h (50 mph).

FTP sensor signal	Fuel tank pressure sensor voltage
High, approximately 1.5 V or more	Negative pressure / vacuum
Low, approximately 1.5 V or less	positive pressure

• DTCs P0101, P0102, P0103, P0116, P0117, P0118, P0119, P0125, P0449, P0498, P0506, P0507, P0721, P0722, P2227, P2228, and P2229 are not set.
• The fuel level is in the range of 12-88 percent.
• Engine coolant temperature at start up is less than 35°C (95°F).
• Vehicle speed is within 10-30 km/h (6-19 mph).
• The ECM is commanding a purge.
• The ratio of ambient pressure to design manifold pressure is less than 0.8.
• DTC P0451 will set permanently if the above conditions remain in place for approximately 100 seconds.

• This DTC may be caused by a clogged or clogged EVAP canister.
• The appearance of this diagnostic trouble code may be caused by a large leak of the fuel vapor capture system adsorber.

1. Remove the fuel filler cap. Attach GE-41415-50 to fuel tank filler neck. Attach J 41413-200 to J 41415-40.
2. Seal the system using the scan tool's Purge Seal feature.
3. Fill the evaporative emission system with nitrogen at a pressure of 5 inches H2O. Compare the scan tool fuel tank pressure signal to the J 41413-200 pressure/vacuum gauge. The scan tool FTP sensor setting should not differ from the pressure/vacuum gauge reading by more than 1 inch H2O.
• If the FTP sensor value differs from the gauge/vacuum gauge by more than 1 inch H2O, replace the FTP sensor.
4. Use a scan tool to command the vent solenoid valve to open.
• If the FTP sensor setting is not 0 in. H20, replace the FTP sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Reference voltage 5 V	P0122, P0452	P0452	P0453	-
FTP sensor signal	P0452	P0452	P0452	-
Low reference voltage	-	-	-	-

FTP sensor signal voltage	Fuel tank pressure
High, approximately 1.5 V or more	Negative pressure / vacuum
low, approx	positive pressure

• The ignition is on or the engine is running.
• Diagnostic checks are performed continuously when the above conditions are met.

1. Ignition on, monitor FTP sensor voltage parameter. FTP sensor voltage should be between 0.2-4.8V.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector at the FTP sensor.
2. Ignition OFF, test for less than 5.0 Ω between the low reference circuit and ground.
• If the resistance is greater than the specified value, test the low voltage reference circuit for an open/high resistance. If the circuit and connections are OK, replace the engine control module (ECM).

Important: The 5V reference circuits are internally and externally connected to the ECM. It is possible to set DTCs of other components. If other DTCs are set, refer to the wiring diagram and determine the relevant circuits and components.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit and ground.
• If the voltage is less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
• If the voltage is above the specified range, test the 5 V reference circuit for a short to power. If no fault is found during circuit/connection testing, replace the ECM.
4. Make sure the FTP sensor parameter is less than 4.8 V
• If the voltage is greater than the specified value, test the signal circuit for a short to power. If no fault is found during circuit/connection testing, replace the ECM.
5. Ignition ON, connect a 3A fuse jumper wire between the signal circuit and the 5V reference circuit. Verify that the FTP sensor parameter is greater than 4.8V.
• If the voltage is less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
6. If the voltage is less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Fuel Level Sensor Reference Voltage Circuit	P0462	-	-	P0461
Fuel Level Sensor Signal Circuit	P0462	P0463 1 P0464	P0463	P0461
Fuel Level Sensor Low Reference Circuit	-	P0463 1 P0464	P0463	P0461
Fuel gauge is inaccurate or not working

• Ignition on, engine running.
• The system voltage is within 9-16 volts.

• Sensor output voltage is less than 0.5 volts.
• The above condition persists for more than 30 seconds.

1. Ignition OFF, disconnect the harness connector from the fuel level sensor.
2. Ignition ON and verify with a scan tool if the parameter is "Fuel level in the tank" value less than 4 percent.
• If greater than 4 percent, test the signal circuit for a short to "mass". If no fault is found during the circuit test, replace the ECM.
3. If no fault is found upon testing all circuits, replace the fuel level sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Fuel Level Sensor Reference Voltage Circuit	P0462	-	-	P0461
Fuel Level Sensor Signal Circuit	P0462	P0463 1 P0464	P0463	P0461
Fuel Level Sensor Low Reference Circuit	-	P0463 1 P0464	P0463	P0461
Fuel gauge is inaccurate or not working

1. Switch off the ignition, remove the fuel level sensor and make sure that there are no obstructions affecting the fuel level sensor.
• Remove detected interference.
2. If there is no interference, replace the fuel level sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Fuel Level Sensor Reference Voltage Circuit	P0462	-	-	P0461
Fuel Level Sensor Signal Circuit	P0462	P0463 1 P0464	P0463	P0461
Fuel Level Sensor Low Reference Circuit	-	P0463 1 P0464	P0463	P0461
Fuel gauge is inaccurate or not working

• Ignition on, engine running.
• The system voltage is within 9-16 volts.

• Sensor output voltage is less than 0.5 volts.
• The above condition persists for more than 30 seconds.

1. Ignition OFF, disconnect the harness connector from the fuel level sensor.
2. Ignition ON and verify with a scan tool if the parameter is "Fuel level in the tank" value less than 4 percent.
• If greater than 4 percent, test the signal circuit for a short to "mass". If no fault is found during the circuit test, replace the ECM.
3. If no fault is found upon testing all circuits, replace the fuel level sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Fuel Level Sensor Reference Voltage Circuit	P0462	-	-	P0461
Fuel Level Sensor Signal Circuit	P0462	P0463 1 P0464	P0463	P0461
Fuel Level Sensor Low Reference Circuit	-	P0463 1 P0464	P0463	P0461
Fuel gauge is inaccurate or not working

• Ignition on, engine running.
• The system voltage is within 9-16 volts.

• The output voltage of the sensor is more than 3.5 volts.
• The above condition persists for more than 30 seconds.

1. Ignition OFF, disconnect the harness connector from the fuel level sensor.
2. Check the resistance between the low reference circuit and a known "weight", which must be less than 1.0 ohm.
• If greater than 1.0 ohms, test the low reference circuit for a short to live or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. Ignition ON, connect a 3 A fuse jumper wire between the signal circuit and the low reference circuit. Verify with the scan tool that the parameter value "Fuel level in the tank" exceeds 98 percent.
• If the voltage is less than 98 percent, test the signal circuit for a short to live or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
4. If no fault is found upon testing all circuits, replace the fuel level sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire
Cooling Fan Relay Control Circuit Low Speed	P0480	P0480	P0480
Cooling Fan Relay Coil Supply Voltage Circuit Low Speed	P0480	P0480	P0480
Cooling Fan Relay Control Circuit High Speed	P0481	P0481	P0481
Cooling Fan Relay Coil Supply Voltage Circuit High Speed	P0481	P0481	P0481

• Ignition in position "ON".
• The system voltage is in the range of 9-18 volts.

• An abnormal voltage level has been detected in the cooling fan relay control circuit.
• This fault must exist for at least 30 seconds.

1. Switch off the ignition, disconnect the blower relay.
2. Turn on the ignition, make sure that the control lamp is not lit, connected between the contact "masses" and well-known "weight".
• If the test lamp is on, test the control circuit for a short to voltage.
3. Turn on the ignition, turn on the test lamp between the control circuit terminal and a reliably known "weight". Send commands to the relay using a scan tool "incl." And "off" The control lamp should light up and go out in accordance with the given commands.
• If the test lamp stays on, test the relay control circuit for a short to live. If no fault is found during the circuit test, replace the ECM.
• If the test lamp is constantly off, test the relay control circuit for a short to "mass" or open/high resistance. If no fault is found during the circuit test, replace the ECM.
4. Turn on the test lamp between the terminal "+" battery and reliably known "weight".
• If the test lamp does not illuminate, test the positive battery terminal for a short to "mass" or open/high resistance.
5. Connect a 30A fusible link between the battery positive pole and the fan power circuit terminal and check that the fan turns on.
• If the fan does not turn on, test the fan power circuit for a short to "mass" or open/high resistance. If the circuit is OK, then replace the fan.
6. If all circuits are normal, replace the relay.

• MAP sensor diagnostic codes not set.
• TP sensor diagnostic codes not set.
• The vacuum in the motor is 0-105 kPa (0-15 psi).
• Engine torque is 54-542 Nm (40-400 lb-ft).
• The TP angle is greater than 12 percent.
• The engine speed is above 3000 rpm.
• Transmission not in PARK (parking) or NEUTRAL (neutral).

1. Start the engine, test the vehicle under the conditions for issuing a fault code. DTC P0500 should not set.

1. Switch on the ignition with the engine off.
2. Disconnect the VSS vehicle speed sensor.
3. Connect a DMM between the power terminal on the VSS harness connector and a good ground.
• If the voltage is less than 4.9 V, test the VSS power circuit for a short to ground or an open/high resistance.
• If the voltage is greater than 5.2 V, test the VSS supply circuit for a short to voltage.
• If the VSS sensor circuit is OK and the voltage is not within the specified range, replace the ECM.
4. Connect a 3A fused jumper wire between the VSS signal circuit and the low reference circuit.
• Monitor sensor parameters by connecting and disconnecting the jumper between the VSS sensor signal circuit and the low reference circuit.
• The value of the VSS sensor should switch between the upper and lower limits.
• If the VSS signal does not switch between high and low limits, the ECM needs to be replaced.
• If the VSS signal toggles between high and low limits, the VSS sensor needs to be replaced.

• Before the ECM reports DTCs P0506 or P0507, DTCs P0722 and P0723 must pass.
• DTCs P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0221, P0222, P0223, P0442, P0443, P0446, P0455, P0458, P0459, P04 96, P0722 and P0723 are not set.
• Fill factor less than 35% (only for DTC P0506).
• Vehicle speed 0 km/h (0 mph).
• Evaporative emission canister purge valve (SUPS) switched off.
• Intake air temperature (IAT) above -10.5°C (+13°F).
• Engine coolant temperature (ECT) above -10.5°C (+13°F).
• The vehicle speed was detected prior to running the diagnostic.
• DTCs P0506 and P0507 are set continuously if the above conditions persist for more than 10 seconds.

• The actual engine speed is greater than the desired idle speed by at least 200 rpm for 4 seconds.

OR

• The ECM detects 3 fuel cuts due to engine overspeed at idle.

1. Check the DTC data with a scan tool.
• If any DTCs for throttle actuator control, throttle position sensor, or accelerator pedal position DTCs are set, refer to the appropriate DTC information.
2. Test the engine under DTC conditions for 1 minute. DTCs P0506 and P0507 should not set.

• If the idle speed does not increase or decrease evenly, check that any of the following conditions are not present:
• Vacuum leak
• Proper Throttle Operation - A throttle that is not fully closed causes this DTC to be set.
• Interference in the intake air system
• Throttle body for damage or unauthorized intervention
• Malfunction or failure of the crankcase ventilation valve PCV
• Excessive soot on the throttle body
• Parasitic load on the engine - e.g. transmission failure, accessory drive belt failure
• Restore the state as needed.

1. When the remote key is used to turn on the ignition or open a door, the BCM and the key exchange security data to confirm that the correct key is being used.
2. After confirming the correct key being used and turning on the ignition, the BCM and ECM communicate to allow the engine to start.
3. In the process of data exchange with each of the devices, different data encryption procedures are used.

• If the key is not programmed into the BCM, key authentication fails and the vehicle is locked.
• If the BCM is not linked to the ECM, the ECM authentication to the BCM fails and the vehicle is locked.
• If the memory in the BCM, key or ECM is corrupted, authentication will fail and the vehicle will be locked.
• If there is a violation in the GMLAN network, authentication will fail and the vehicle will be locked.

Important: To check the communication between the car's anti-theft system (VTD) and the ECM present type DTCs "B" (related to the anti-theft system) must be diagnosed before diagnosing DTCs of the type "P".

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Engine Oil Pressure Sensor 5V Reference Circuit	P0522	P0522	P0523	P0521
Engine Oil Pressure Sensor Signal Circuit	P0522	P0523	P0523	P0521
Low reference voltage	-	P0523	-	P0521

• The ECM detects that the signal level in the EOP sensor circuit is below the set parameter.
• This condition persists for more than 10 seconds.

1. Ignition OFF, disconnect the harness connector from the engine oil pressure sensor (EOP).
2. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit and ground.
• If less than 4.8 V, test the 5 V reference circuit for a short to "mass" or open/high resistance. If the circuit is normal, replace the ECM.
• If the voltage is greater than 5.2 V, test the 5 V reference circuit for a short to voltage. If no fault is found during the circuit test, replace the ECM.
3. Verify that the engine oil pressure sensor parameter is greater than 550 kPa using a scan tool (80 psi).
• If less than 550 kPa, test the signal circuit for a short to ground. If no fault is found during the circuit test, replace the ECM.
4. If all circuits test normal, test or replace the EOP sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Engine Oil Pressure Sensor 5V Reference Circuit	P0522	P0522	P0523	P0521
Engine Oil Pressure Sensor Signal Circuit	P0522	P0523	P0523	P0521
Low reference voltage	-	P0523	-	P0521

• The ECM detects that the voltage on the EOP sensor signal circuit is below 0.1 V.
• This condition persists for more than 10 seconds.

1. Ignition OFF, disconnect the harness connector from the engine oil pressure sensor (EOP).
2. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit and ground.
• If less than 4.8 V, test the 5 V reference circuit for a short to "mass" or open/high resistance. If the circuit is normal, replace the ECM.
• If the voltage is greater than 5.2 V, test the 5 V reference circuit for a short to voltage. If no fault is found during the circuit test, replace the ECM.
3. Verify that the engine oil pressure sensor parameter is greater than 550 kPa using a scan tool (80 psi).
• If less than 550 kPa, test the signal circuit for a short to ground. If no fault is found during the circuit test, replace the ECM.
4. If all circuits test normal, test or replace the EOP sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Engine Oil Pressure Sensor 5V Reference Circuit	P0522	P0522	P0523	P0521
Engine Oil Pressure Sensor Signal Circuit	P0522	P0523	P0523	P0521
Low reference voltage	-	P0523	-	P0521

• The ECM detects that the voltage on the EOP sensor signal circuit is greater than 4.4 V.
• This condition persists for more than 10 seconds.

1. Ignition OFF, disconnect the harness connector from the engine oil pressure sensor (EOP).
2. Ignition OFF, test for less than 1 Ω resistance between the low reference circuit and a good ground.
• If greater than 1 Ω, test the low reference circuit for a short to voltage or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit and a good ground.
• If less than 4.8 V, test the 5 V reference circuit for a short to "mass" or open/high resistance. If the circuit is normal, replace the ECM.
• If the voltage is greater than 5.2 V, test the 5 V reference circuit for a short to voltage. If no fault is found during the circuit test, replace the ECM.
4. Connect a 3A fused jumper wire between the signal circuit and the low reference circuit. Verify that the engine oil pressure sensor parameter is below 8 kPa with a scan tool (1,2 psi).
• If greater than 8 kPa, test the signal circuit for a short to voltage or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
5. If all circuits test normal, test or replace the EOP sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
A/C Refrigerant Pressure Sensor Signal Circuit (A/C)	P0532	P0532	P0533	-
5 V reference circuit	P0532	P0532	-	-
Reference circuit low	-	P0533	-	-

• engine running
• Any of the DTC conditions persist for 15 seconds.
• The battery voltage is within 11-18 V.

• The ECM detects that the A/C pressure is less than 1 psi (0.01 V).
• The ECM detects that the A/C pressure is greater than 428 psi (4.92 V).

1. Ignition OFF, disconnect the A/C pressure sensor harness connector.
2. Ignition OFF, test for less than 1 Ω between the low reference circuit terminal and ground.
• If resistance is greater than 1 Ω, test the low reference circuit for an open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal and ground.
• If less than 4.8 V, test the 5 V reference circuit for a short to "mass" or open/high resistance. If the circuit is normal, replace the ECM.
• If the voltage is greater than 5.2 V, test the 5 V reference circuit for a short to voltage. If no fault is found during the circuit test, replace the ECM.
4. Verify the A/C high pressure sensor parameter is less than 428 psi with a scan tool.
• If greater than 428 psi, test the signal circuit for a short to voltage. If no fault is found during the circuit test, replace the ECM.
5. Connect a 3 amp fused jumper wire between signal circuit pin 3 and 5 volt reference circuit pin 2. Using a scan tool, verify that the A/C high pressure sensor parameter is greater than 428 psi.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Ignition 1 Signal (Ignition signal 1)	P0562	P0562	-	-

• Vehicle speed over 8 km/h (5 mph).
• The voltage in the system is in the range of 9.5-18 V.

1. Measure the battery voltage and compare it with the ignition voltage signal parameter in the ECM data list. Verify that the battery voltage and the ignition voltage signal reading differ by no more than 1 V.
• If the difference is greater than 1 volt, test the ignition circuit at the ECM for a short to ground or an open/high resistance. If no fault is found during the circuit test, replace the ECM.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Ignition 1 Signal (Ignition signal 1)	P0562	P0562	-	-

• Vehicle speed over 8 km/h (5 mph).
• The voltage in the system is in the range of 9.5-18 V.

1. Measure the battery voltage and compare it with the ignition voltage signal parameter in the ECM data list. Verify that the battery voltage and the ignition voltage signal reading differ by no more than 1 V.
• If the difference is greater than 1 volt, test the ignition circuit at the ECM for a short to ground or an open/high resistance. If the circuit is normal, replace the ECM.

• Vehicle speed over 8 km/h (5 mph).
• The voltage in the system is in the range of 9.5-18 V.

• A possible reason for issuing this DTC may be to recharge the battery or start the engine from an external voltage source.

1. Measure the battery voltage and compare it to the ignition circuit signal parameter in the ECM data list. Verify that the battery voltage and the ignition voltage signal reading differ by no more than 1 V.
• If the difference is greater than 1 volt, test the ignition circuit at the ECM for a short to voltage or an open/high resistance. If the circuit is normal, replace the ECM.

• Vehicle speed varied between 0-60 km/h (0-37 mph) 3 times in 1 ignition cycle.
• Permanent if the above conditions are met.

• The TCM detects voltage on the TCC/Brake/Cruise control switch signal circuit when the circuit should be open.

1. Switch off the ignition, connect the scan tool.
2. Verify that no other DTCs are set.
3. Ignition ON, with a scan tool observe the Torque Converter Clutch Switch parameter (TCC) /brakes in the transmission TCC data list.
• The TCC switch/brake parameter should indicate the status "open". If the status is shown "closed", test the TCC/brake/cruise control switch circuit for a short to voltage.
• If all circuits test normal, replace the BCM.
4. Ignition on, observing the scan tool, depress the brake pedal.
• The TCC switch/brake parameter should indicate the status "closed". If the status is shown "open", test the TCC/brake/cruise control circuit to the ECM for a short to ground or an open/high resistance.
• If all circuits test normal, replace the ECM.
5. If all circuits test normal, replace the BPP sensor.

• If DTC P0601 or P0604 fails this ignition cycle, replace the engine control module (ECM).

• Ensure that all instruments are connected securely.
• Ensure correct operation of programming equipment.
• Ensure proper software and correct calibration is used.
• Attempt to program the ECM.
• If DTC P0602 sets, replace the ECM.

• Read fault logs with a scan tool.
• Clear the DTCs with a scan tool.
• Switch off the ignition within 30 seconds.
• Create conditions for the vehicle to generate a DTC. You can also create conditions for the vehicle that have been observed based on the recorded disturbance data.
• If DTC P0606 fails this ignition cycle, replace the ECM.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Controller circuit	junior code	junior code	Senior code	-
Winding side supply voltage circuit	junior code	junior code	-	-

• The ECM detects an incorrect voltage level in the control circuit or output circuit that controls the starter relay.

• Ignition system trouble codes are set when the ignition switch is in the "start", and the starter relay or starter is inoperative. When the ECM enables the starter. If there is a condition preventing the engine from starting, the ECM will not receive input from the CKP and CMP sensors and DTCs will be set.
• Reviewing fault logs since the last failed diagnostic test can help diagnose the problem. This information can help determine how often the situation occurs in which this DTC is set.

1. Ignition ON, use a scan tool to command the starter relay on and off. Verify by touch or ear that each relay turns on and off with the appropriate commands.

1. Switch off the ignition, disconnect the starter relay.
2. Ignition on, verify that the test lamp does not illuminate between the appropriate terminals and a good ground.
• If the test lamp is on, test the signal circuit for a short to voltage.
3. Turn on the ignition. Connect a test lamp between the control circuit terminal and a good ground. Use the scan tool to command the relay to turn on and off. The control lamp should light up and go out in accordance with the given commands.
• If the test lamp stays on, test the relay control circuit for a short to voltage. If the circuit is normal, replace the ECM/
• If the test lamp does not illuminate at all, test the relay control circuit for a short to ground or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
4. Connect a test lamp between the voltage contact "B+" and reliable mass.
• If the test lamp does not illuminate, check the battery voltage circuit "B+" short to ground or open/high resistance.
5. Disconnect the starter motor winding wire from the starter, connect a test lamp between the starter winding wire and a good ground. Connect a 10A fused jumper wire between the positive battery terminal and the starter motor power circuit terminal, verify that the test lamp illuminates.
• If the test lamp does not illuminate, test the starter motor winding supply circuit for a short to ground or an open/high resistance. If all circuits test normal, replace the relay.

• Vehicle speed over 8 km/h (5 mph).
• The voltage in the system is in the range of 9.5-18 V.

1. Ignition OFF, disconnect the alternator harness connector.
2. Ignition ON, engine OFF, connect a test lamp to battery positive voltage and test the harness-side alternator excitation duty cycle circuit repeatedly with a dipstick while observing the alternator F terminal signal parameter in the ECM data list. The value must range from 0 to a value greater than 95%.
• If the alternator F terminal signal parameter does not change when a test lamp is connected, test the alternator F terminal signal circuit for a short to ground or an open/high resistance. If the circuit is normal, replace the ECM.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Fuel pump relay control	P0628	P0627	P0629	-
Fuel pump weight	-	P0627	-	-
Battery Voltage - Switch Relay	1	2	-	-
Fuel pump supply voltage	1	2	3	-
The fuel relay fuse opens, the engine cranks, but the engine does not start. Engine cranks but engine does not start. The fuel pump runs continuously, the battery is discharging.

• Ignition on, engine off.
• Ignition 1 voltage is greater than 10.5 V.
• The ECM has commanded the fuel pump relay on and off at least once during the ignition cycle.
• The above conditions occur for more than 1 second.
• Diagnostic checks are performed continuously when the above conditions are met.

1. Ignition OFF, disconnect the fuel pump relay.
2. Connect a test lamp between the fuel pump relay control circuit and the negative battery terminal.
3. Ignition ON, use a scan tool to command the fuel pump on and off. The control lamp should turn on and off in accordance with the control commands.
• If the test lamp stays off all the time, test the control circuit for a short to ground or an open/high resistance. If the circuits and connectors test normal, replace the ECM.
• If the test lamp stays on, test the control circuit for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
4. Ignition OFF, connect a test lamp between the fuel pump relay control circuit and the fuel pump relay ground circuit.
5. Ignition ON, use a scan tool to command the fuel pump on and off. The control lamp should turn on and off in accordance with the control commands.
• If the test lamp does not come on when commanded on, repair the open/high resistance in the ground circuit of the fuel pump relay.
6. If all circuits/connections test normal, test or replace the fuel pump relay.

1. Measure the resistance between terminals 85 and 86 of the fuel pump relay; resistance should be in the range of 70 - 110 ohms.
• If resistance is not within the specified range, replace the fuel pump relay.
2. Measure the resistance between the following terminals of the fuel pump relay; resistance must be infinite.
• 30 and 86
• 30 and 87
• 30 and 85
• 85 and 87
• If a connection is found, replace the fuel pump relay.
3. Connect a 20A fused jumper wire between the positive battery terminal and terminal 85 of the fuel pump relay. Connect a jumper wire between the negative battery terminal and terminal 86 of the fuel pump relay. Measure the resistance between terminals 30 and 87 of the fuel pump relay; resistance must be less than 2 ohms.
• If resistance is greater than 2 ohms, replace the fuel pump relay.

• The ignition is on or the engine is running.
• Ignition 1 voltage is greater than 7V.
• DTCs P0638 and P2102 are set continuously if the above conditions are met for more than 1 second.

• DTC 2101 must pass before the ECM reports DTC P2100.
• The ignition is on or the engine is running.
• DTC P2100 is set continuously if the above conditions are met for more than 1 second.

• The ignition is on.
• Vehicle speed is 0 km/h (0 mph).
• Engine speed is below 40 rpm.
• Engine coolant temperature (ECT) within 5-85°C (41-185°F).
• Intake air temperature (IAT) within 5-60°C (41-140°F).
• Ignition 1 voltage is greater than 10 V.
• Accelerator pedal position (APP) less than 15%.
• DTC P2119 is set once per ignition cycle if the above conditions persist for less than 1 second.

• The ECM detects that the duty cycle for the upper limit of the test range exceeds 80% for more than 0.6 seconds.

OR

• The ECM detects that the duty cycle for the lower limit of the test range exceeds 80% for more than 5 seconds.

• The ECM detects that the TAC motor output driver does not turn off on a shutdown command.
• The condition persists for less than 4 seconds.

• The ECM detects that the difference between the set and actual throttle position is greater than 10%.
• This state occurs for less than 4 seconds.

1. Ignition ON, monitor for DTC information with a scan tool. Verify DTCs P0121, P0122, P0123, P0221, P0222, or P0223 are not set.
• If any of these DTCs set, proceed to further diagnosis for DTC P0121, P0122, P0123, P0221, P0222, or P0223.
2. Using a scan tool, verify that the TP 1 sensor voltage is between 0.2-0.9 V and the TP 2 sensor voltage is between 4.2-4.8 V.
• If any TP sensor voltage is not within the specified range, proceed to further diagnosis for DTC P0121, P0122, P0123, P0221, P0222, or P0223.
3. Quickly depress the accelerator pedal from the starting position to the wide open throttle position (WOT) and release the pedal. Repeat this procedure several times. DTC P0638, P2111, P2112, or P2119 should not set.
• If this procedure sets any of the DTCs P0121, P0122, P0123, P0221, P0222, or P0223, proceed to further diagnosis for DTC P0121, P0122, P0123, P0221, P0222, or P0223.
4. Slowly depress the accelerator pedal until the throttle is fully open and then slowly return the pedal to the closed throttle position. Repeat this procedure several times. DTC P0638, P2111, P2112, or P2119 should not set.
• If this procedure sets any of the DTCs P0121, P0122, P0123, P0221, P0222, or P0223, proceed to further diagnosis for DTC P0121, P0122, P0123, P0221, P0222, or P0223.
5. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Check the throttle body for the following faults:
• Throttle valve not in original position
• Throttle stuck open or closed
• Throttle valve opens or closes without spring pressure
• If a problem is found, replace the damaged throttle body.

Important: Disconnecting the throttle body harness connector causes additional DTCs to set.

2. Ignition OFF, disconnect the harness connector from the throttle body. Ignition on, measure the voltage of motors 1 and 2 control circuits; voltage should be 2-4 V.
• If the voltage is less than 2 V, test the control circuit of the affected motor for an open circuit or short to ground. If the circuit is normal, replace the ECM.
• If the voltage is greater than 4 V, test the appropriate motor control circuit for a short to voltage. If no fault is found during the circuit test, replace the ECM.
3. Ignition OFF, connect an injector test light between the control circuits of the TAC 1 motor and the TAC 2 motor of the throttle body harness connector. Watching the control lamp of the injector, turn on the ignition for 5 seconds and turn it off. Verify that the injector control lamp lights up brightly.
• If the injector test lamp does not illuminate, test for a short between the TAC 1 motor control circuit and the TAC 2 motor control circuit. If no fault is found during the circuit test, replace the ECM.
4. If all circuits test normal, replace the throttle body.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire
A/C Clutch Relay Control Circuit (A/C)	P0646	P0645, P0646	P0647
A/C Clutch Relay Coil Supply Voltage Circuit (A/C)	P0646	P0645, P0646	P0647

• The ignition is on.
• The voltage in the system is within 9-18 V.

• An incorrect voltage level has been detected in the A/C control circuit.
• This condition must be maintained for at least 30 seconds.

1. Ignition OFF, disconnect the harness connector at the A/C compressor.
2. Turn on the ignition, make sure the test lamp lights up between the voltage contact "B+" and reliable mass.
• If the test lamp does not illuminate, check the voltage circuit "B+" short to ground or open/high resistance. If the circuit is normal, replace the ECM
3. Ignition ON, use a scan tool to command the A/C compressor to turn on. Verify that the test lamp illuminates between the voltage circuit "B+" and control circuit.
• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit is normal, replace the ECM
4. If all circuits test normal, Replace the A/C compressor clutch.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Malfunction indicator lamp supply voltage	P0650	P0650	-	-
Malfunction indicator lamp control	P0650/MIL ON	P0650	P0650	-

• Engine speed over 80 rpm
• Ignition voltage 1 in the range of 10-18 volts.
• The ECM has commanded the MIL to turn on and off at least once during the ignition cycle.
• DTC P0650 runs continuously after the specified conditions are met.

• The ECM detects an open circuit, short to ground, or short to battery voltage on the MIL control circuit.
• This state has been present for at least 4 seconds.

1. If any of the other indicators or gauges on the instrument panel do not work, refer to Section 9E, Gauges/Driver Information.
2. Ignition OFF, disconnect the ECM harness connectors. Switch on the ignition, the MIL should be off.
• If the MIL is on, test the MIL control circuit for a short to ground.
3. Ignition ON, connect a 3A fused jumper wire between the MIL control circuit and battery negative. The Malfunction Indicator Lamp should illuminate.
• If the MIL does not illuminate, test the MIL control circuit for a short to voltage or an open/high resistance. If the circuit is OK, replace the instrument panel/bulb.
4. If all circuits/connections test normal, replace the ECM.

Important: A main relay failure will set multiple DTCs. The DTCs listed in the table will only set if there is a problem with the main relay.

Chain	Insulation with "weight"	high resistance	Gap	Short to live wire	Signal parameters
Supply voltage B+ - Winding	P0685	P0685	P0685	-	-
Supply voltage B+ - Switch	-	P0689	P0689	P0690	-
Relay control circuit	P0686	P0685	P0685	P0687	P0685
Ignition voltage circuit 1	-	P0689	P0689	P0690	-

• ECM fuse or HFV6 ECM fuse
• ETC fuse
• Fuse PRE O2/CAM
• POST O2 fuse
• Fuse EVEN INJ/COIL
• Fuse ODD INJ/COIL

• The battery voltage is in the range of 10.5-18 volts.
• Switch off the ignition.
• A command has been given to turn off the main relay.
• Diagnostic checks are performed continuously when the above conditions are met.

• The battery voltage is in the range of 10.5-18 volts.
• Ignition in position "ON".
• A command has been given to turn on the main relay.
• These DTCs run continuously after the specified condition is met.

• The prescribed state of the output driver module and the actual state of the control circuit do not match.

OR

• The ECM detects that the main relay feedback circuit voltage is not within the expected range when the main relay is commanded on or off.
• One of these states has been present for more than 2 seconds.

• This test procedure requires that the vehicle battery pass the load test and be fully charged. See Battery Inspection/Test under "Engine electrical equipment".
• When disconnecting electrical connectors or removing fuses and relays from the fuse box, always check component terminals for corrosion and paired electrical contacts for tight fit.
• For tests that require connection to the underhood fuse box terminals, component harness connector pins, or ECM harness connector pins, use the J 35616 Connector Test Adapter Kit.

1. Ignition ON, clear DTCs with a scan tool.
2. Switch off the ignition for 30 seconds.
3. Ignition ON, obtain DTC information with a scan tool.
4. Verify DTC information with a scan tool. DTC P0685, P0686, P0687, P0689 or P0690 should not set.

1. Switch off the ignition, disconnect the ignition relay or the main engine control relay.

Important: To create a load in the circuit, a test lamp is used, which may not light up.

2. Connect a test lamp between the B+ supply circuit on the coil side of the main relay and the negative battery terminal.
3. Ignition ON, test for voltage between the B+ voltage circuit of the main relay and the positive battery terminal; voltage must be less than 0.1V.
• If greater than 0.1 V, repair the B+ voltage circuit on the winding side of the main relay for a short to ground or an open/high resistance.

Important: To create a load in the circuit, a test lamp is used, which may not light up.

4. Connect a test lamp between the B+ voltage circuit on the switch side of the main relay and the negative battery terminal.
5. Ignition ON, test for voltage between the B+ voltage circuit of the main relay and the positive battery terminal; voltage must be less than 0.1 V.
• If greater than 0.1 V, repair the B+ voltage circuit on the switch side of the main relay for a short to ground or an open/high resistance.
6. With the ignition on, turn on a test lamp between the main relay control circuit and the B+ voltage supply circuit on the coil side of the main relay.
7. Turn on the ignition. The warning lamp should come on when the ignition switch is set to the "included", and turn off when the ignition switch is turned to "turned off".
• If the test lamp stays on, test the control circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
• If the test lamp remains off, test the control circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.

Important: The ignition 1 voltage circuit connects the main relay and the ECM. The ignition 1 voltage circuit is a feedback circuit.

8. Connect a jumper wire with a 15 amp fuse between the B+ supply voltage circuit and the ignition 1 voltage circuit of the main relay.
9. Try to start the engine. The engine should start.
• If the engine does not start, test the ignition 1 voltage circuit between the main relay and the ECM for a short to ground or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
10. If all circuits/connections test normal, test or replace main relay.

1. Measure the resistance between terminals 85 and 86 of the main relay; resistance should be in the range of 70 - 110 ohms.
• If the resistance is not within the specified range, replace the main relay.
2. Measure the resistance between the following terminals of the main relay; resistance must be infinite.
• 30 and 86
• 30 and 87
• 30 and 85
• 85 and 87
• If a connection is found, replace the main relay.
3. Connect a 20A fused jumper wire between the positive battery terminal and terminal 85 of the fuel pump relay. Connect a jumper wire between the negative battery terminal and terminal 86 of the fuel pump relay. Measure the resistance between terminals 30 and 87 of the fuel pump relay; resistance must be less than 2 ohms.
• If the resistance is greater than 2 ohms, replace the main relay.

• Ignition in position "ON".
• The system voltage is in the range of 9-18 volts.

• An abnormal voltage level has been detected in the engine management system ignition relay feedback circuit.
• This fault must exist for at least 30 seconds.

1. Switch off the ignition, disconnect the ignition relay of the engine management system.
2. Turn on the ignition, make sure that the control lamp is not lit, connected between the contact "masses" and well-known "weight".
• If the test lamp is on, test the control circuit for a short to voltage.
3. Turn on the ignition, turn on the test lamp between the control circuit terminal and a reliably known "weight". Send commands to the relay using a scan tool "incl." And "off" The control lamp should light up and go out in accordance with the given commands.
• If the test lamp stays on, test the relay control circuit for a short to live. If no fault is found during the circuit test, replace the ECM.
• If the test lamp is constantly off, test the relay control circuit for a short to "mass" or open/high resistance. If no fault is found during the circuit test, replace the ECM.
4. Turn on the test lamp between the terminal "+" battery and reliably known "weight".
• If the test lamp does not illuminate, test the battery positive circuit for a short to "mass" or open/high resistance.
5. Connect a 30 amp fusible link between the positive battery terminal and the power circuit terminal of the ignition relay of the engine management system and check the circuit is turned on.
• If the circuit does not turn on, test the power supply circuit of the engine management system ignition relay for a short to "mass" and open / high resistance. If the circuit is OK, then replace the fan.
6. If all circuits are normal, replace the relay.

• Ignition in position "ON".
• The system voltage is in the range of 9-18 volts.

• An abnormal voltage level has been detected in the cooling fan relay control circuit.
• This fault must exist for at least 30 seconds.

1. Ignition OFF, disconnect the appropriate blower relay.
2. Turn on the ignition, make sure that the control lamp is not lit, connected between the contact "masses" and well-known "weight".
• If the test lamp is on, then check the connection circuit to "mass" for a short circuit to a live wire.
3. Turn on the ignition, turn on the test lamp between the control circuit terminal and a reliably known "weight". Send commands to the relay using a scan tool "incl." And "off" The control lamp should light up and go out in accordance with the given commands.
• If the test lamp stays on, test the relay control circuit for a short to live. If no fault is found during the circuit test, replace the ECM.
• If the test lamp is constantly off, test the relay control circuit for a short to "mass" or open/high resistance. If no fault is found during the circuit test, replace the ECM.
4. Turn on the test lamp between the terminal "+" battery and reliably known "weight".
• If the test lamp does not illuminate, test the positive battery terminal for a short to "mass" or open/high resistance.
5. Connect a 30A fusible link between the battery positive pole and the fan power circuit terminal and check that the fan turns on.
• If the fan does not turn on, test the fan power circuit for a short to "mass" or open/high resistance. If the circuit is OK, then replace the fan.
6. If all circuits are normal, replace the relay.

• Ignition in position "ON".
• The system voltage is in the range of 9-18 volts.

• An abnormal voltage level has been detected in the cooling fan relay control circuit.
• This fault must exist for at least 30 seconds.

1. Ignition OFF, disconnect the appropriate blower relay.
2. Turn on the ignition, make sure that the control lamp is not lit, connected between the contact "masses" and well-known "weight".
• If the test lamp is on, then check the connection circuit to "mass" for a short circuit to a live wire.
3. Turn on the ignition, turn on the test lamp between the control circuit terminal and a reliably known "weight". Send commands to the relay using a scan tool "incl." And "off" The control lamp should light up and go out in accordance with the given commands.
• If the test lamp stays on, test the relay control circuit for a short to live. If no fault is found during the circuit test, replace the ECM.
• If the test lamp is constantly off, test the relay control circuit for a short to "mass" or open/high resistance. If no fault is found during the circuit test, replace the ECM.
4. Turn on the test lamp between the terminal "+" battery and reliably known "weight".
• If the test lamp does not illuminate, test the positive battery terminal for a short to "mass" or open/high resistance.
5. Connect a 30A fusible link between the battery positive pole and the fan power circuit terminal and check that the fan turns on.
• If the fan does not turn on, test the fan power circuit for a short to "mass" or open/high resistance. If the circuit is OK, then replace the fan.
6. If all circuits are normal, replace the relay.

• The ignition is on or the engine is running.
• DTC P0700 runs continuously.

Important: Before diagnosing TCM DTCs, resolve any existing engine control DTCs.

• The engine is running.
• The system voltage is in the range of 9-18 volts.

• The ECM detects that there have been 15 shifts and there have been less than 3 clutch pedal switch operations.

1. Switch off the ignition, disconnect the clutch pedal switch at the switch.
2. Switch on the ignition, make sure that the test lamp is on, connected between the signal contact and a reliably known "weight".
• If the test lamp does not illuminate, test the signal circuit for a short to voltage "mass" or open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. Connect a 10A fuse between the signal circuit and the contact "masses" at the wiring harness connector.
• The scan tool display should show the status "Included" (Active).
• If the message remains on the display "Disabled" (Inactive), then check the circuit "masses" for short circuit "mass" or open/high resistance.
4. If all circuits test normal, replace the clutch switch.

• DTCs P0010, P0013, P0020, P0023, P2088, P2089, P2090, P2091, P2092, P2093, P2094, and P2095 are not set.
• Engine running for more than 1 second.
• The ECM has completed testing the camshaft position actuator output driver.
• Engine speed over 1000 rpm.
• DTCs P1011, P1012, P1013 and P1014 only run when the engine is started.

Important: The engine oil level and pressure are critical to the correct operation of the camshaft timing drive system. Before proceeding with this diagnosis, it is necessary to verify that the required oil level and pressure are present.

• Start the engine. Check that there are no abnormal noises when starting the engine.
• Monitor DTC information with a scan tool. DTCs P1011, P1012, P1013 and P1014 should not set.
• If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.
• Inform the customer that DTCs P1011, P1012, P1013, or P1014 may be caused by the following:
• Switching off the engine with the accelerator pedal depressed
• Switching off the engine while driving
• Pressing the accelerator pedal to start the engine

• If abnormal engine noise is present or DTCs P1011, P1012, P1013, or P1014 are set, replace the appropriate camshaft position actuator.

• Vehicle speed is 0 km/h (0 mph).
• Engine speed is less than 40 rpm.
• Engine coolant temperature (ECT) is within 5-85°C (41-185°F).
• Intake air temperature is between 5-60°C (41-140°F).
• Ignition voltage 1 is greater than 10 volts.
• Accelerator pedal position less than 15%.
• DTC P1551 Sets When Throttle Actuator Motor Disables

• Throttle control using the scan tool Throttle Position Control function may cause additional DTCs to set. DO NOT attempt to diagnose DTCs set while using this feature.
• Among the special functions of the scan tool is the throttle control system control function. This feature allows you to control the throttle position over the entire range of travel to check the correct operation of the throttle assembly and control system.
• Check the conditions under which the throttle can be considered open.
• Check for situations that may cause ice to form in the throttle bore.
• The throttle valve is spring-loaded in the open position. The throttle should be about 3-5 percent open. This is the starting position. The throttle valve must not be fully closed or open more than the specified value. The throttle should move to the open and closed positions without binding under normal spring force. The throttle should NOT move freely to the open or closed positions WITHOUT spring force.

• Ignition ON, obtain DTC information with a scan tool. Verify that DTCs P0121, P0122, P0123, P0221, P0222, P0223, P2100, P2101, or P2119 are not set.
• If one of the above DTCs is set, refer to the relevant DTC information for further diagnosis.
• Monitor the DTC information with a scan tool for 30 seconds. DTC P1551 should not set.
• If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

• Throttle valve NOT in home position
• Throttle stuck open or closed
• Throttle valve moves freely to open or closed positions WITHOUT spring force
• If a problem is found, replace the throttle body.

Important: Since there is normal communication between the TDM and the ECM, type B related codes must be set before type P codes are set.

1. When the ignition is turned on or the door is unlocked with the remote key, security data is exchanged between the BCM and the key to verify the key being used.
2. Once the key is validated and the ignition is turned on, communication between the BCM and the ECM takes place to start the engine
3. Data exchange processes consist in the exchange of various encrypted data between each of the devices.

Important: Failure to complete any of these password validation processes will prevent the engine from starting and will store diagnostic trouble codes. More information about the anti-theft system.

• If the key is not programmed in the BCM, then the key validation will fail and the vehicle's immobilizer will be activated.
• If no communication link is established between the BCM and the ECM, then the BCM will fail the validation of the ECM password and the vehicle's immobilizer will be enabled.
• If the memory in the BCM, key or ECM is faulty, then the password validation process will fail and the vehicle's immobilizer will be enabled.
• If there is a problem in the GMLAN network, then the password verification will not be performed and the car's immobilizer will be turned on.

Important: Since there is normal communication between the TDM and the ECM, type B related codes must be set before type P codes are set. Perform the anti-theft alarm system programming procedure. The ECM should successfully complete learning the password and the engine should start.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Alternator L terminal circuit	P0621	P0621	P0621	P0621

1. With the ignition on and engine off, disconnect the harness from the alternator and measure the alternator enable circuit voltage, which should be close to 0 volts.
• If more than 0 V, test the generator enable circuit for a short to live. If no fault is found during the circuit test, replace the ECM.
2. With the ignition on and the engine running, the alternator enable circuit voltage must be greater than 3.5 volts.
• If there is no voltage, test the generator enable circuit for a short to "mass" or open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. If no fault is found when testing all circuits.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Ignition voltage 1	P2009?	P2008	-	-
IMRC control circuit	P2009	P2008	P2010	-
?Opens the fuse that energizes the IMRC solenoid.

• The ignition is on or the engine is running.
• Diagnostic checks are performed continuously when the above conditions are met.

1. Ignition ON, use a scan tool to command the IMRC solenoid on and off. There should be a tangible and audible click.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector from the IMRC solenoid.
2. Ignition ON, test battery voltage between the ignition 1 voltage circuit of the IMRC solenoid and ground.
• If the voltage is less than B+, repair the short to ground or open/high resistance in the ignition 1 voltage circuit of the IMRC solenoid. Replace fuse if necessary.
3. Ignition OFF, connect a test lamp between the control circuit and the ignition 1 voltage circuit of the IMRC solenoid.
4. Ignition ON, use a scan tool to command the IMRC solenoid to turn on. The control lamp should turn on and off.
• If the test lamp stays on, test the control circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
• If the test lamp remains off, test the control circuit for a short to live or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. If all circuits/connections test normal, replace IMRC solenoid.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Fuel Level Sensor Reference Voltage Circuit	P0462	-	-	P0461
Fuel Level Sensor Signal Circuit	P0462	P0463 1 P0464	P0463	P0461
Fuel Level Sensor Low Reference Circuit	-	P0463 1 P0464	P0463	P0461
Fuel gauge is inaccurate or not working

• Ignition on, engine running.
• The system voltage is within 9-16 volts.

• Sensor output voltage is less than 0.5 volts.
• The above condition persists for more than 30 seconds.

1. Ignition OFF, disconnect the harness connector from the fuel level sensor.
2. Ignition ON and verify with a scan tool if the parameter is "Fuel level in the tank" value less than 4 percent.
• If greater than 4 percent, test the signal circuit for a short to "mass". If no fault is found during the circuit test, replace the ECM.
3. If no fault is found upon testing all circuits, replace the fuel level sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Fuel Level Sensor Reference Voltage Circuit	P2067	-	-	P2066
Fuel Level Sensor Signal Circuit	P2067	P2068	P2068	P2066
Fuel Level Sensor Low Reference Circuit	-	P2068	P2068	P2066

1. Ignition OFF, disconnect the harness connector from the fuel level sensor.
2. Ignition ON and verify with a scan tool if the parameter is "Fuel level in the tank" value less than 4 percent.
• If greater than 4 percent, test the signal circuit for a short to "mass". If no fault is found during the circuit test, replace the ECM.
3. Ignition ON, connect a 3 A fuse jumper wire between the signal circuit and the low reference circuit. Verify with the scan tool that the parameter value "Fuel level in the tank" exceeds 98 percent.
• If the voltage is less than 98 percent, test the signal circuit for a short to live or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
4. If no fault is found upon testing all circuits, replace the fuel level sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Fuel Level Sensor Reference Voltage Circuit	P2067	-	-	P2066
Fuel Level Sensor Signal Circuit	P2067	P2068	P2068	P2066
Fuel Level Sensor Low Reference Circuit	-	P2068	P2068	P2066

• Ignition on, engine running.
• The system voltage is within 9-16 volts.

• Sensor output voltage is less than 0.5 volts.
• The above condition persists for more than 30 seconds.

1. Ignition OFF, disconnect the harness connector from the fuel level sensor.
2. Ignition ON and verify with a scan tool if the parameter is "Fuel level in the tank" value less than 4 percent.
• If greater than 4 percent, test the signal circuit for a short to "mass". If no fault is found during the circuit test, replace the ECM.
3. If no fault is found upon testing all circuits, replace the fuel level sensor.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Fuel Level Sensor Reference Voltage Circuit	P2067	-	-	P2066
Fuel Level Sensor Signal Circuit	P2067	P2068	P2068	P2066
Fuel Level Sensor Low Reference Circuit	-	P2068	P2068	P2066

• Ignition on, engine running.
• The system voltage is within 9-16 volts.

• The output voltage of the sensor is more than 3.5 volts.
• The above condition persists for more than 30 seconds.

1. Ignition OFF, disconnect the harness connector from the fuel level sensor.
2. Check the resistance between the low reference circuit and a known "weight", which must be less than 1.0 ohm.
• If greater than 1.0 ohms, test the low reference circuit for a short to live or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. Ignition ON, connect a 3 A fuse jumper wire between the signal circuit and the low reference circuit. Verify with the scan tool that the parameter value "Fuel level in the tank" exceeds 98 percent.
• If the voltage is less than 98 percent, test the signal circuit for a short to live or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
4. If no fault is found upon testing all circuits, replace the fuel level sensor.

• Check the IMRC solenoid for signs of valve hitting the intake manifold. This state may be temperature dependent.
• Inspect the intake manifold length adjustment flap, which should be free of foreign objects or significant contamination.

• engine running

• The ECM detects that the IMT sensor voltage is out of the required operating range for more than 4 seconds.

• Check the IMRC solenoid for signs of valve hitting the intake manifold. This state may be temperature dependent.

1. Start the engine, quickly depress the accelerator pedal from its original position to the wide open throttle position and return the pedal to its original position. Repeat the procedure several times. DTC P2111 should not set.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Disconnect the harness connector from the IMT system. Connect a test lamp between the power terminal and the return terminal.
2. Command the IMT valve with a scan tool "incl." And "off" Observe the test lamp, which should light up with each change in the state of the control circuit.
• If the test lamp does not illuminate, test the power and return circuits for a short to "mass" or open/high resistance.
3. If all circuits test normal, replace the ECM.
4. Create conditions for the vehicle to generate a DTC. You can also create conditions for the vehicle that have been observed based on the recorded disturbance data.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
HO2S signal	P0131, P0137, P2096, P2098	P0134, P0140	P0132, P0138, P2097, P2099	P0133
Low reference voltage	-	P0134, P0140	P0132, P0138, P2097, P2099	P0133

• Signal circuit
• Low voltage reference circuit
• Ignition voltage circuit 1
• Heater control circuit

• DTCs P0030, P0031, P0032, P0041, P0050, P0051, P0052, P0101, P0131, P0132, P0135, P0137, P0138, DTCs P0030, P0031, P0032, P0138, P0140, P0141, P0151, P0152, P0155, P0157, P0158, P0160, P0161, P2231, P2234, P2237, P2240, P2243, P2247, P2251, P2254, P2270, P2271, P2273, P2 626 and P2629.
• The engine has been running for more than 2 seconds.
• The control of fuel correction based on the results of measurement at the outlet of the catalytic converter is enabled.
• The front and rear HO2S operate in closed loop mode.
• The diagnostic checks associated with codes P2096 and P2098 run continuously as soon as the above conditions are met for more than 40 seconds.

• The post-catalyst fuel correction correction is shifted lean more than 3 percent of the HO2S value for more than 4 seconds.

1. With the engine running, monitor the HO2S voltage parameter. This value should fluctuate above and below the 350-550 mV range.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector from the affected HO2S.
2. Ignition on, check that the HO2S parameter is in the range of 350-500 mV.
• If less than 350 mV, test the HO2S signal circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
3. Check for the following faults:
• Lean fuel at injectors.
• Water intrusion into the HO2S harness connector.
• Low pressure in the fuel supply system.
• Fuel contamination.
• Exhaust leak near HO2S.
• HO2S sensor contaminated with silicone.
• Engine vacuum leak.
• If any of the above faults is found, it should be eliminated.
4. If no problem is found on testing all circuits/connections, replace the appropriate HO2S.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
HO2S signal	P0131, P0137, P2096, P2098	P0134, P0140	P0132, P0138, P2097, P2099	P0133
Low reference voltage	-	P0134, P0140	P0132, P0138, P2097, P2099	P0133

• Signal circuit
• Low voltage reference circuit
• Ignition voltage circuit 1
• Heater control circuit

• DTCs P0030, P0031, P0032, P0041, P0050, P0051, P0052, P0101, P0131, P0132, P0135, P0137, P0138, DTCs P0030, P0031, P0032, P0138, P0140, P0141, P0151, P0152, P0155, P0157, P0158, P0160, P0161, P2231, P2234, P2237, P2240, P2243, P2247, P2251, P2254, P2270, P2271, P2273, P2 626 and P2629.
• The engine has been running for more than 2 seconds.
• The control of fuel correction based on the results of measurement at the outlet of the catalytic converter is enabled.
• The front and rear HO2S operate in closed loop mode.
• Diagnostic checks corresponding to codes P2097 and P2099 are performed continuously as soon as the above conditions are met for more than 40 seconds.

• The post-catalytic converter fuel delivery correction drifts richer than -3 percent of the HO2S value for more than 4 seconds.

1. With the engine running, monitor the HO2S voltage parameter. This value should fluctuate above and below the 350-550 mV range.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector from the affected HO2S.
2. Ignition on, check that the HO2S parameter is in the range of 350-500 mV.
• If less than 350 mV, test the HO2S signal circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
3. Check for the following faults:
• Rich mixture in fuel injectors
• Water intrusion into the HO2S harness connector.
• High pressure in the fuel supply system.
• Fuel contamination.
• Saturation of the adsorber of the gasoline vapor recovery system with fuel (SUPS)
• Difficult release of exhaust gases.
• HO2S sensor contaminated with silicone
• If any of the above faults is found, it should be eliminated.
4. If no problem is found on testing all circuits/connections, replace the appropriate HO2S.

• The ECM power down process in the last driving cycle is complete.
• DTC P2105 runs continuously after the specified condition is met.

• If DTC P2105 sets, the engine will stall and will not start until the ignition is turned off and back on.
• Other DTCs set at the same time as P2105.
• The ignition key cannot be removed from the ignition lock until the next ignition cycle begins.

1. Start the engine, quickly depress the accelerator pedal from its original position to the wide open throttle position and return the pedal to its original position. Repeat the procedure several times. DTC P2105 should not set.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, remove ECM fuse (ECM) or HFV6 ECM fuse. Check fuse.

Important: This DTC will only set if the fuse is open and the circuits are not grounded. The ignition 1 voltage circuits should be carefully tested for an intermittent short to ground.

• If the fuse is open, test both ignition 1 voltage circuits between the fuse and the ECM for an intermittent short to ground.
2. Install fuse.
3. Disconnect the ECM harness connector. Ignition ON, test under load for battery voltage on both ignition 1 voltage circuits at the ECM.
• If the voltage is less than B+, repair the open/high resistance of the ignition 1 voltage circuit.
4. If all circuits and connections test normal, replace the ECM.

• Vehicle speed is 0 km/h (0 mph).
• Engine speed is less than 40 rpm.
• Engine coolant temperature is between 5-85°C (41-185°F).
• Intake air temperature is between 5-60°C (41-140°F).
• Ignition voltage 1 is greater than 10 volts.
• Accelerator pedal position less than 15%.
• The ECM is performing a closed throttle test with the ignition on and the engine off.
• DTC P2107 runs when the above conditions are met during initialization of the throttle actuator control system.

1. Ignition ON, monitor DTC information with a scan tool for 30 seconds. DTC P2107 should not set.
• If DTC P2107 sets, replace the ECM.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

• Ignition in position "ON".
• Vehicle speed is less than 40 km/h
• The measured intake air temperature is greater than 40°C.

1. Start the engine, quickly depress the accelerator pedal from its original position to the wide open throttle position and return the pedal to its original position. Repeat the procedure several times. DTC P2111 should not set.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Disconnect the ECM harness connector. Ignition ON, test under load for battery voltage on the ignition voltage circuits at the ECM.
• If the voltage is less than B+, repair the open/high resistance of the ignition voltage circuit.
2. If all circuits and connections test normal, replace the ECM.

Chain	Insulation with "weight"	high resistance	Gap	Short to live wire	Signal parameters
Accelerator Pedal Position Sensor 1 5 V Reference Circuit (APP)	P2122	P2138	P2122	P2123	-
Accelerator Pedal Position Sensor 2 5 V Reference Circuit (APP)	P0122, P0222, P2122	P0121, P0221, P2138	P2127	P0123, P0223, P2123	-
Accelerator pedal position sensor 1 signal (APP)	P2122	P2138	P2122	P2123	P2138
Accelerator pedal position sensor 2 signal (APP)	P2127	P2138	P2127	P2128	P2138
Accelerator Pedal Position Sensor 1 Low Reference Circuit (APP)	-	-	P2123	-	-
Accelerator Pedal Position Sensor 1 Low Reference Circuit (APP)	-	-	P2128	-	-

• The ignition is on or the engine is running.
• Ignition 1 voltage is greater than 7 volts.
• Diagnostic checks are performed continuously when the above conditions are met.

• The ECM detects that the voltage difference between APP sensors 1 and 2 is greater than 0.21V.
• The ECM detects that the voltage difference between APP sensors 1 and 2 is greater than 0.27V when the pedal is partially depressed.
• The ECM detects that the voltage difference between APP sensors 1 and 2 with the pedal fully depressed is greater than 1.07V.
• The ECM detects that the APP 1 sensor voltage is greater than 1.17V when out of idle range and that the voltage difference between APP 1 and 2 sensors is greater than 0.04V.
• Any of the above conditions occurs for more than 4 seconds.

1. Turn on the ignition, monitor the parameters of the APP sensors using a scan tool. Verify that the voltages of both APP sensors are between 0.4-4.5V.
2. Quickly depress the accelerator pedal from the starting position to the wide open throttle position (WOT) and release the pedal. Repeat this procedure several times. DTC P2122, P2123, P2127, P2128 or P2138 should not set.
3. Slowly depress the accelerator pedal until the throttle is fully open and then slowly return the pedal to the closed throttle position. Repeat this procedure several times. DTC P2122, P2123, P2127, P2128 or P2138 should not set.
4. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the wiring harness connector from the accelerator pedal assembly.
2. Ignition OFF, test for resistance between the appropriate APP sensor low reference circuit and ground; resistance must be below 5 ohms.
• If greater than 5 ohms, test the APP sensor low reference circuit for a short to power or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.

Important: The 5V reference circuits are internally and externally connected to the ECM. It is possible to set DTCs of other components. If other DTCs are set, refer to the wiring diagram and determine the relevant circuits and components.

3. Ignition ON, test for voltage between the appropriate APP sensor 5V reference voltage circuit and ground; voltage should be in the range of 4.8-5.2 V.
• If less than 4.8 V, test the APP sensor 5 V reference circuit for a short to ground or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
• If greater than 5.2 V, test the APP sensor 5 V reference circuit for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
4. Using a scan tool, verify that the voltage setting of the associated APP sensor is less than 0.3V.
• If the voltage is greater than 0.3 V, test the signal circuit of the appropriate APP sensor for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
5. Connect a 3A fused jumper wire between the appropriate signal circuit and the 5V reference circuit of the APP sensor. Verify that the APP sensor voltage setting is greater than 4.8V.
• If less than 4.8 V, test the appropriate APP sensor signal circuit for a short to ground or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
• If both APP sensors voltages are greater than 4.8V, test the signal circuits of both APP sensors for a short to each other. If no fault is found during circuit/connection testing, replace the ECM.
6. If all circuits/connections test normal, test or replace the accelerator pedal assembly.

• Engine speed is less than 40 rpm.
• Vehicle speed is 0 km/h (0 mph).
• Engine coolant temperature (ECT) is within 5-85°C (41-185°F).
• Intake air temperature is greater than 5-60°C (41-140°F).
• The signal of the accelerator pedal position sensor corresponds to an angle of less than 14.9%.
• Ignition voltage 1 is greater than 10 volts.
• DTC P2176 runs continuously after the above conditions occur for approximately 1 second.

• The ECM detects that the TP sensor voltage 1 is not between 0.2-0.9V during the idle parameter detection procedure.
• The ECM detects that the TP sensor 2 voltage is not between 4.2-4.8V during the idle parameter detection procedure.
• Minimum throttle position not set during idle detection after ECM replacement.
• Any of the above conditions occurs for more than 4 seconds.

1. Turn on the ignition, quickly depress the accelerator pedal from the starting position to the wide open throttle position (WOT) and release the pedal. Repeat the procedure several times. Check the DTC data with a scan tool. Verify that DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0638, or P2101 are not set.
• If one of the above DTCs is set, refer to the relevant DTC information for further diagnosis.
2. DTC P2176 is an informational DTC. Carry out the procedure for determining the parameters of idling, refer to the procedure for determining the parameters of idling.
• If DTC P2176 re-sets after performing the Idle Speed Finder procedure, replace the throttle body.
3. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

• DTCs P0101, P0121, P0122, P0123, P0133, P0153, P0221, P0222, P0223, P0336, P0338, P0443, P0458, must pass before the ECM reports DTCs P2177, P2179, P2187, or P2189. P0459, P0461, P0462, P0463, P2066, P2067 and P2068.
• The fuel system is in a closed circuit.
• Long-term fuel trim is in effect.
• Engine coolant temperature is over 60°C (140°F).
• Intake air temperature less than 60°C (140°F).
• The evaporative emission canister purge solenoid valve is not included.
• Fuel level is over 11.6%.
• The air supply to the engine is greater than 7,000 g.
• DTCs P2177, P2179, P2187 and P2189 run continuously after the above conditions occur for at least 300 seconds.

• This DTC is set when there is a problem with the fuel delivery system. Carefully check all items that cause the lean condition. Cm. "Fuel system diagnostics".
• Any unmetered air entering the engine will cause this DTC to occur. Carefully inspect all areas of the engine for vacuum leaks.
• A MAF sensor problem can cause this DTC to set without the MAF sensor DTC setting. If the mass air flow sensor is defective, the parameters of the mass air flow sensor will appear normal.
• Verify that the type of PCV valve being used is correct. Check the correct type of air filter being used. Make sure the fuel filler cap is in place and tightly closed. Make sure the engine oil dipstick is fully inserted.

1. If other DTCs other than DTCs P2177, P2179, P2187, or P2189 are set, refer to those DTCs for diagnosis.
2. The engine is at normal operating temperature, monitor the parameter Total Fuel Trim Avg. using a scanning tool. Parameter Total Fuel Trim Avg. should be between -22 and +23%.

1. Read the LT FT Bn 1 and Bn 2 Cruise/Accel parameters to find out if the lean mixture is affecting one bank of the engine or both.
• If lean affects both rows, check for the following problems:
• Zero shift of the mass air flow sensor.
• Vacuum leaks in the air intake system after the mass air flow sensor.
• Fuel contamination.
• Cracked, kinked, or bad vacuum hose connections.
• The fuel system is running in lean mode.
• Vacuum leaks in the intake manifold of the throttle body.
• Leak in the forced crankcase ventilation system.
• Grounding the ECM for cleanliness, tightness and correct installation.
• Check for high engine oil level - High engine oil level causes oil residue to form on the mass air flow sensor (MAF), causing a lean mixture indication. Mass air flow sensor (MAF) does not need to be replaced.
• If the lean condition occurs for only one bank of engine cylinders, check for the following problems:
• Vacuum leaks affecting only one bank of cylinders - for example, in the intake manifold, in the injector o-rings.
• Feeding too lean mixture by nozzles.
• Missing, clogged or leaking exhaust system components.
• Reliability of heated oxygen sensor installation (HO2S) and the lack of contact of the electrical connector with the exhaust system.
• Mechanical engine problems.
2. If everything is normal, see Diagnostic Information.

• DTCs P0101, P0121, P0122, P0123, P0133, P0153, P0221, P0222, P0223, P0336, P0338, P0443, P0458, P0 must pass before the ECM reports P2178, P2180, P2188, or P2190. 459, P0461, P0462, P0463, P2066, P2067 and P2068.
• The fuel system is in a closed circuit.
• Long-term fuel trim is in effect.
• Engine coolant temperature is over 60°C (140°F).
• Intake air temperature less than 60°C (140°F).
• The evaporative emission canister purge solenoid valve is not included.
• Fuel level is over 11.6%.
• The air supply to the engine is greater than 7,000 g.
• DTCs P2178, P2180, P2188, and P2190 run continuously after the above conditions occur for at least 300 seconds.

1. If other DTCs are also set, refer to the relevant DTC information for further diagnosis.
2. The engine is at normal operating temperature, monitor the parameter Total Fuel Trim Avg. using a scanning tool. Parameter Total Fuel Trim Avg. should be between -22 and +23%.

1. Read LT FT Bn 1 and Bn 2 Cruise/Accel or Idle/Decel parameters to find out if the rich mixture is affecting one bank or both.
• If enrichment affects both rows, check for the following problems:
• Zero shift of the mass air flow sensor.
• Damaged intake duct
• Reduced air filter capacity
• Foreign bodies in the mass air flow sensor.
• Excessive ingress of fuel into the crankcase - if necessary, change the oil.
• Fuel contamination.
• Grounding the ECM for cleanliness, tightness and correct installation
• Mechanical engine problems.
• If the rich condition occurs for only one bank of engine cylinders, check for the following problems:
• Supply of too rich mixture by nozzles.
• Exhaust obstruction.
• Mechanical engine problems.
2. If everything is normal, see Diagnostic Information.

• The ignition voltage is within 10-16 volts.
• The engine is running.

• Warm up the engine to operating temperature. With the engine running, monitor the value of the HO2S being tested with a scan tool.
• The HO2S 1 signal value should change from less than 200 mV to more than 800 mV and respond to changes in fuel delivery.
• The HO2S 2 signal value should become greater than 200 mV when changing the throttle position from closed to wide open and then closed again, quickly performed 3 times after the engine has been running for 30 seconds at 1500 rpm.
• If any HO2S heater DTCs are set, you must first run diagnostics on those codes.
• A malfunctioning HO2S sensor may be caused by contamination. Before replacing the HO2S sensor under test, check for the following sources of contamination:

1. Disable the HO2S being tested.
2. Ignition ON, measure the voltage between the low voltage signal circuit terminal of the HO2S under test and a known "weight", which should be approximately 2-40 mV.
• If the voltage is greater than approximately 40 mV, test the low voltage signal circuit of the HO2S under test for a short to live. If the circuit is normal, then replace the controller.
• If the voltage is less than approximately 2 mV, test the low voltage signal circuit of the HO2S under test for a high resistance. If the circuit is normal, then replace the controller.
3. Measure the voltage between the high voltage signal circuit terminal of the HO2S under test and a known "weight", which should be approximately 450 mV.
• If the voltage is greater than approximately 450 mV, test the high voltage signal circuit of the HO2S under test for a short to live. If the circuit is normal, then replace the controller.
• If the voltage is less than approximately 450 mV, test the high voltage signal circuit of the HO2S under test for a high resistance. If the circuit is normal, then replace the controller.
4. Install a 3 A fused jumper wire between the high voltage signal and low voltage signal terminals of the HO2S under test. The HO2S being tested should read 0 mV.
• If the value obtained is not 0 mV, and checking all circuits and connectors does not reveal a malfunction, then replace the controller.
5. Connect a test lamp between the high voltage terminal of the HO2S under test and battery voltage. The HO2S under test should read approximately 1095 mV.
• If the value obtained is not 1095 mV, and testing of all circuits and connectors does not reveal a malfunction, then replace the controller.
6. If the controller and all circuits are normal, replace the tested HO2S.

• The ignition voltage is within 10-16 volts.
• The engine is running.

• Warm up the engine to operating temperature. With the engine running, monitor the value of the HO2S being tested with a scan tool.
• The HO2S 1 signal value should change from less than 200 mV to more than 800 mV and respond to changes in fuel delivery.
• The HO2S 2 signal value should become greater than 200 mV when changing the throttle position from closed to wide open and then closed again, quickly performed 3 times after the engine has been running for 30 seconds at 1500 rpm.
• If any HO2S heater DTCs are set, you must first run diagnostics on those codes.
• A malfunctioning HO2S sensor may be caused by contamination. Before replacing the HO2S sensor under test, check for the following sources of contamination:

1. Disable the HO2S being tested.
2. Ignition ON, measure the voltage between the low voltage signal circuit terminal of the HO2S under test and a known "weight", which should be approximately 2-40 mV.
• If the voltage is greater than approximately 40 mV, test the low voltage signal circuit of the HO2S under test for a short to live. If the circuit is normal, then replace the controller.
• If the voltage is less than approximately 2 mV, test the low voltage signal circuit of the HO2S under test for a high resistance. If the circuit is normal, then replace the controller.
3. Measure the voltage between the high voltage signal circuit terminal of the HO2S under test and a known "weight", which should be approximately 450 mV.
• If the voltage is greater than approximately 450 mV, test the high voltage signal circuit of the HO2S under test for a short to live. If the circuit is normal, then replace the controller.
• If the voltage is less than approximately 450 mV, test the high voltage signal circuit of the HO2S under test for a high resistance. If the circuit is normal, then replace the controller.
4. Install a 3 A fused jumper wire between the high voltage signal and low voltage signal terminals of the HO2S under test. The HO2S being tested should read 0 mV.
• If the value obtained is not 0 mV, and checking all circuits and connectors does not reveal a malfunction, then replace the controller.
5. Connect a test lamp between the high voltage terminal of the HO2S under test and battery voltage. The HO2S under test should read approximately 1095 mV.
• If the value obtained is not 1095 mV, and testing of all circuits and connectors does not reveal a malfunction, then replace the controller.
6. If the controller and all circuits are normal, replace the tested HO2S.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
Reference voltage 5 V	P2228	P2228	P2229	-
Barometric pressure sensor signal	P2228	P2228	P2229	-
Low reference voltage	P2228 -	P2229	-	-

• DTCs P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, P0338, P2228, and P2229 must pass before the ECM reports DTC P2227.
• The engine has been running for more than 20 seconds.
• The mass air flow is greater than 11 g/s.
• The difference between calculated manifold absolute pressure and barometric pressure is less than 1.0 kPa for more than 3 seconds.
• DTC P2227 runs continuously after the specified conditions occur for 2 seconds.

• The engine is running.
• These DTCs run continuously after the above conditions occur for 2 seconds.

• The ECM detects that the barometric pressure has changed by more than 5 kPa within 20 seconds.
• The ECM detects that the barometric pressure has changed more than 30 kPa since the last ignition cycle.
• Any of the listed states occurs for at least 4 seconds.

• The ECM detects that the barometric pressure sensor signal voltage is less than 0.20 V and the barometric pressure sensor pressure is less than 50 kPa.
• The above condition occurs for more than 4 seconds.

• The ECM detects that the barometric pressure sensor signal voltage is greater than 4.8 V and the barometric pressure sensor pressure is greater than 115 kPa.
• The above condition occurs for more than 4 seconds.

1. Start the engine, read the DTC information with a scan tool. DTC P2227, P2228 or P2229 should not set.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition ON, monitor the barometric pressure sensor parameter with a scan tool by moving the harness connectors at the barometric pressure sensor and the ECM. Make sure that the parameter of the barometric pressure sensor does not change by more than 3 kPa.
• If the barometric pressure sensor parameter changes by more than the specified amount, repair the associated wiring harnesses/connectors.
2. Ignition OFF, disconnect the harness connector from the barometric pressure sensor.

Important: The barometric pressure sensor signal circuit is pulled high through a 1 MΩ resistor.

3. Ignition ON, monitor barometric pressure sensor signal voltage with a scan tool. Verify that the scan tool reads 4.8-5.2V.
• If the signal is less than 4.8 V, test the signal circuit of the barometric pressure sensor for a short to ground. If no fault is found during circuit/connection testing, replace the ECM.
• If greater than 5.2 V, test the signal circuit of the barometric pressure sensor for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
4. Connect a fused jumper wire from the signal circuit of the barometric pressure sensor to the ECM housing. Verify the barometric pressure sensor signal voltage parameter with a scan tool. Verify the scan tool reads 0 V.
• If the signal is greater than 0 V, test the signal circuit of the barometric pressure sensor for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.

Important: The 5V reference circuits are internally and externally connected to the ECM. It is possible to set DTCs of other components. If other DTCs are set, refer to the wiring diagram and determine the relevant circuits and components.

5. Test for voltage between the 5 V voltage reference circuit of the barometric pressure sensor and ground; the voltage should be 4.8-5.2 V.
• If less than 4.8 volts, test the 5 volt reference circuit of the barometric pressure sensor for a short to ground or an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
• If greater than 5.2 V, test the 5 V reference voltage circuit of the barometric pressure sensor for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
6. Ignition OFF, remove the ECM/TCM fuse from the electrical box under the hood.

Note: DO NOT use a test light to check for an open circuit. Damage to this control unit can lead to an increase in current.

7. Test the resistance between the barometric pressure sensor low reference circuit and ground; resistance must be less than 5 ohms.
• If resistance is greater than 5 ohms, test the low reference circuit of the barometric pressure sensor for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
8. If all circuits/connections test normal, replace the barometric pressure sensor.

• DTCs P0030, P0031, P0032, P0050, P0051 and P0052 do not set.
• HO2S heater control is enabled.

• The HO2S internal signal voltage occurs at the same frequency as the heater circuits.
• HO2S heater control is enabled.
• The ECM internal sensing element resistance is greater than 570 ohms.
• The ECM detects an internal HO2S signal voltage of 1.47 - 1.53 V.
• The HO2S is at operating temperature.

1. Ignition on, monitor the voltage parameter of the appropriate HO2S sensor. The voltage parameter of the HO2S must be less than 1050 mV.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector from the affected HO2S.
2. Ignition on, check that the HO2S parameter is in the range of 350-500 mV.
• If the signal is greater than 500 mV, test the HO2S signal circuit for a short to the heater circuit. If no fault is found during circuit/connection testing, replace the ECM.
3. If no problem is found on testing all circuits/connections, replace the appropriate HO2S.

• The ignition voltage is within 10-16 volts.
• The engine is running in closed loop mode.
• The HO2S heater is at operating temperature.
• The ECM issues a command to maintain the value "lambda" greater than 1.03 or less than 0.97.
• The ECM is commanding engine braking fuel cut for more than 3 seconds.
• The ECM periodically issues a command to maintain the value "lambda", corresponding to a rich mixture and then a lean one, by a change greater than 2 percent.

• Warm up the engine to operating temperature. With the engine running, monitor the value of the HO2S being tested with a scan tool.
• The HO2S 1 signal value should change from less than 200 mV to more than 800 mV and respond to changes in fuel delivery.
• The HO2S 2 signal value should become greater than 200 mV when changing the throttle position from closed to wide open and then closed again, quickly performed 3 times after the engine has been running for 30 seconds at 1500 rpm.
• If any HO2S heater DTCs are set, you must first run diagnostics on those codes.
• A malfunctioning HO2S sensor may be caused by contamination. Before replacing the HO2S sensor under test, check for the following sources of contamination:

1. Disable the HO2S being tested.
2. Ignition ON, connect a 3 A fuse jumper wire between the voltage reference circuit and the low reference circuit.
• Connect a digital multimeter between the input of the pump current circuit and a well-known "weight". If the voltage is not equal to 1 volt, then check for a short to "mass", short to live wire or open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. If no fault is found on all circuits tested, replace the HO2S under test.

• The ignition voltage is within 10-16 volts.
• The engine is running.

• Warm up the engine to operating temperature. With the engine running, monitor the value of the HO2S being tested with a scan tool.
• The HO2S 1 signal value should change from less than 200 mV to more than 800 mV and respond to changes in fuel delivery.
• The HO2S 2 signal value should become greater than 200 mV when changing the throttle position from closed to wide open and then closed again, quickly performed 3 times after the engine has been running for 30 seconds at 1500 rpm.
• If any HO2S heater DTCs are set, you must first run diagnostics on those codes.
• A malfunctioning HO2S sensor may be caused by contamination. Before replacing the HO2S sensor under test, check for the following sources of contamination:

1. Disable the HO2S being tested.
2. Measure the voltage between the reference voltage circuit terminal of the HO2S under test and a known "weight", which should be approximately 450 mV.
• If the voltage is greater than approximately 450 mV, test the reference voltage circuit of the HO2S under test for a short to live. If the circuit is normal, then replace the controller.
• If the voltage is less than approximately 450 mV, test the high voltage signal circuit of the HO2S under test for a high resistance. If the circuit is normal, then replace the controller.
3. Install a 3 A fused jumper wire between the voltage reference circuit and the low voltage signal circuit terminals of the HO2S under test. The HO2S being tested should read 0 mV.
• If the value obtained is not 0 mV, and checking all circuits and connectors does not reveal a malfunction, then replace the controller.
4. Connect a test lamp between the reference voltage circuit terminal of the HO2S under test and battery voltage. The HO2S under test should read approximately 1095 mV.
• If the value obtained is not 1095 mV, and testing of all circuits and connectors does not reveal a malfunction, then replace the controller.
5. If the controller and all circuits are normal, replace the tested HO2S.

• The ignition voltage is within 10-16 volts.
• The engine is running.

• Warm up the engine to operating temperature. With the engine running, monitor the value of the HO2S being tested with a scan tool.
• The HO2S 1 signal value should change from less than 200 mV to more than 800 mV and respond to changes in fuel delivery.
• The HO2S 2 signal value should become greater than 200 mV when changing the throttle position from closed to wide open and then closed again, quickly performed 3 times after the engine has been running for 30 seconds at 1500 rpm.
• If any HO2S heater DTCs are set, you must first run diagnostics on those codes.
• A malfunctioning HO2S sensor may be caused by contamination. Before replacing the HO2S sensor under test, check for the following sources of contamination.

1. Disable the HO2S being tested.
2. Install a 3 A fused jumper wire between the low reference signal circuit and the low reference return circuit.
• If the voltage is not 1 volt, test the circuit for a short circuit or an open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. If the controller and all circuits are normal, replace the tested HO2S.

• DTCs P0036, P0037, P0038, P0056, P0057, P0058, P0137, P0138, P0140, P0141, P0157, P0158, P0160, P0161, P0342, P0343, P0366, P0367, P0368, P 0443, P0451, P0452, P0453, P0458 and P0459 are not set.
• The engine is running.
• The HO2S 2 has been at operating temperature for more than 10 seconds.
• Long-term fuel trim is in effect.

• When the ECM detects that the HO2S 2 voltage is less than 650 mV for 100 seconds, the ECM will command the fuel mixture to richen up to 30 percent for 10 seconds. This DTC will set if the ECM detects that the HO2S 2 voltage is still less than 650 mV.
• The engine is running.
• The HO2S 2 has been at operating temperature for more than 10 seconds.
• Long-term fuel trim is in effect.

1. Ignition ON, obtain DTC information with a scan tool. Verify DTCs P0137, P0138, P0140, P0157, P0158, or P0160 are not set.
• If one of the above DTCs is set, refer to the relevant DTC information for further diagnosis.
2. Warm up the engine at over 1200 rpm for 30 seconds while monitoring the HO2S voltage parameter. This value should fluctuate above and below the 350-550 mV range.
3. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. With the engine running, wiggle the wiring harnesses for the appropriate rear HO2S between the HO2S wiring harness connector and the ECM while observing the appropriate HO2S voltage parameter. Make sure that the HO2S parameter does not change abruptly when the respective harnesses are moved.
• If the HO2S parameter changes drastically when the respective harnesses are moved, repair the respective circuits.
2. Ignition OFF, disconnect the harness connector from the affected HO2S.
3. Ignition on, check that the HO2S parameter is in the range of 350-500 mV.
• If less than 350 mV, test the HO2S signal circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
4. Check for the following faults:
• Lean fuel at injectors.
• Water intrusion into the HO2S harness connector.
• Low pressure in the fuel supply system.
• Fuel contamination.
• Vacuum hoses for integrity, creases and reliability of connections
• Air intake system after MAF for vacuum leak
• Exhaust system for leaks
• HO2S sensor contaminated with silicone
• Mechanical engine problems.
• If any of the above faults is found, it should be eliminated.
5. If no problem is found on testing all circuits/connections, replace the appropriate HO2S.

• DTCs P0036, P0037, P0038, P0056, P0057, P0058, P0137, P0138, P0140, P0141, P0157, P0158, P0160, P0161, P0342, P0343, P0366, P0367, P0368, P 0443, P0451, P0452, P0453, P0458 and P0459 are not set.
• The engine is running.
• The HO2S 2 has been at operating temperature for more than 10 seconds.
• Long-term fuel trim is in effect.

• When the ECM detects that the HO2S 2 voltage is greater than 650 mV for 100 seconds, the ECM will command the fuel mixture to lean up to -7 percent for 10 seconds. If the signal voltage is still greater than 650 volts, then the ECM checks the HO2S at the next engine brake fuel cut. This DTC will set if the ECM detects that the HO2S 2 signal voltage is greater than 200 mV after 4 seconds have elapsed in engine braking fuel cut mode.

1. Ignition ON, obtain DTC information with a scan tool. Verify DTCs P0137, P0138, P0140, P0157, P0158, or P0160 are not set.
• If one of the above DTCs is set, refer to the relevant DTC information for further diagnosis.
2. Warm up the engine at over 1200 rpm for 30 seconds while monitoring the HO2S voltage parameter. This value should fluctuate above and below the 350-550 mV range.
3. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. With the engine running, wiggle the wiring harnesses for the appropriate rear HO2S between the HO2S wiring harness connector and the ECM while observing the appropriate HO2S voltage parameter. Make sure that the HO2S parameter does not change abruptly when the respective harnesses are moved.
• If the HO2S parameter changes drastically when the respective harnesses are moved, repair the respective circuits.
2. Ignition OFF, disconnect the harness connector from the affected HO2S.
3. Ignition on, check that the HO2S parameter is in the range of 350-500 mV.
• If the signal is greater than 500 mV, test the HO2S signal circuit for a short to voltage. If no fault is found during circuit/connection testing, replace the ECM.
4. Check for the following faults:
• Rich mixture in fuel injectors
• Water intrusion into the HO2S harness connector.
• High pressure in the fuel supply system.
• Fuel contamination.
• Damaged intake duct
• Reduced air filter capacity
• Obstacles in the exhaust system
• Too much fuel in crankcase
• Mechanical engine problems.
• If any of the above faults is found, it should be eliminated.
5. If no problem is found on testing all circuits/connections, replace the appropriate HO2S.

Chain	Insulation with "weight"	Open / high resistance	Short to live wire	Signal parameters
HO2S signal bank 1 sensor 1	P0131	P0130, P0134	P0132	P0130, P0133
HO2S signal bank 2 sensor 1	P0137	P0136, P0140	P0138	P0136, P0139
HO2S signal bank 2 sensor 1	P0151	P0150, P0154	P0152	P0150, P0153
HO2S signal bank 2 sensor 2	P0157	P0156, P0160	P0158	P0156, P0159
Low reference voltage	-	P0130, P0136, P0150, P0156	P0134, P0140, P0154, P0160	-

• The ignition voltage is within 10-16 volts.
• The engine is running.
• The front heated oxygen sensors are at operating temperature.
• The ECM HO2S internal signal voltage is less than 4.81 volts.
• The engine braking fuel cut was performed 10 times and the adjustment was successful.

1. Engine idling, determine the voltage for the appropriate HO2S sensor. This value should fluctuate above and below the 350-550 mV range.
2. If the vehicle has successfully passed the circuit/system test, then the conditions required for diagnosis should be provided. It is also possible to provide the conditions recorded in the status/fault log data records.

1. Ignition OFF, disconnect the harness connector at the appropriate HO2S.
2. Ignition on, check that the HO2S parameter is in the range of 350-500 mV.
• If less than 350 mV, test the signal circuit for a short to "mass". If no fault is found during circuit/connection testing, replace the ECM.
• If more than 500 mV, test the signal circuit for a short to live. If no fault is found during circuit/connection testing, replace the ECM.
3. Ignition OFF, test for 5 ohms or less between the HO2S low reference circuit and a known "weight".
• If greater than 5 ohms, test the low reference circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
4. Connect a 3 A fused jumper wire between the signal circuit and the HO2S low reference circuit, and test the HO2S parameter for less than 60 mV.
• If greater than 60 mV, test the signal circuit for an open/high resistance. If no fault is found during circuit/connection testing, replace the ECM.
5. If no problem is found on testing all circuits/connections, replace the HO2S.

• The ignition voltage is within 10-16 volts.
• The engine is running in closed loop mode.
• The HO2S heater is at operating temperature.
• The ECM issues a command to maintain the value "lambda" greater than 1.03 or less than 0.97.
• The ECM is commanding engine braking fuel cut for more than 3 seconds.
• The ECM periodically issues a command to maintain the value "lambda", corresponding to a rich mixture and then a lean one, by a change greater than 2 percent.

• Warm up the engine to operating temperature. With the engine running, monitor the value of the HO2S being tested with a scan tool.
• The HO2S 1 signal value should change from less than 200 mV to more than 800 mV and respond to changes in fuel delivery.
• The HO2S 2 signal value should become greater than 200 mV when changing the throttle position from closed to wide open and then closed again, quickly performed 3 times after the engine has been running for 30 seconds at 1500 rpm.
• If any HO2S heater DTCs are set, you must first run diagnostics on those codes.
• A malfunctioning HO2S sensor may be caused by contamination. Before replacing the HO2S sensor under test, check for the following sources of contamination.

1. Disable the HO2S being tested.
2. Ignition ON, connect a 3 A fuse jumper wire between the voltage reference circuit and the low reference circuit.
• Connect a digital multimeter between the input of the pump current circuit and a well-known "weight". If the voltage is not equal to 1 volt, then check for a short to "mass", short to live wire or open/high resistance. If no fault is found during the circuit test, replace the ECM.
3. If no fault is found on all circuits tested, replace the HO2S under test.

Step	Operation	Values	Yes	No
1	Is the diagnostic system check complete?	-	Go to step 2	Go to item "Diagnostic system check".
2	Switch off the ignition for 30 seconds. Operate the vehicle under conditions that cause DTCs to occur. Using a scan tool, select the DTC display function. Did DTC U0001 occur during this ignition cycle?	-	Go to step 3	-
3	Replace the ECM. Is the repair finished?	-	Go to step 4	-
4	Using a scan tool, clear the DTCs. Switch off the ignition for 30 seconds. Start the engine. Operate the vehicle under conditions that cause DTCs to occur. Did DTC U0001 occur during this ignition cycle?	-	Go to step 2	Go to step 5
5	Using a scan tool, select the DTC display function. Are any DTCs shown on the display?	-	Go to the appropriate DTC table.	System OK

• Ignition switch in the on position.

• There is no signal from the corresponding node of the CAN network
• Message-"key" not received from TCM node.
• The ECM detects that both the left and right drive wheels received invalid information

• DTCs U0101 and U0121 are Type C DTCs.

• DTCs U0101 and U0121 are Type C DTCs.

• This code may be due to an unreliable connection on an inactive module.
• This code may be set by a module that is not properly powered.
• If there are several controllers with which there is no communication, then you must select the one that is closest to the diagnostic block. Some modules do not have internal protection for certain voltage outputs and may be exposed to battery positive or ignition voltage. If the input voltage fuse is open and no short is found on that circuit, ensure that none of the module's output voltage circuits is shorted to ground before replacing the module. This diagnostic can be used on any module that must send serial data over high or low speed GMLAN circuits, provided the vehicle is equipped with an option that uses this module.

Step	Operation	Values	Yes	No
1	Have you performed a diagnostic system check?	-	Go to step 2	Go to item "Diagnostic system check".
2	Test the following circuits on the failing module for an open or short to ground: Battery positive voltage input circuits Battery Positive Voltage Output Circuits Ignition voltage input circuits Ignition voltage output circuits Switched Battery Positive Voltage Circuits Fault found and corrected?	-	Go to step 7	Go to step 3
3	Switch off the ignition. Check the ground circuits of the module with which communication cannot be established for an open circuit. Fault found and corrected?	-	Go to step 7	Go to step 4
4	Test the GMLAN high-speed serial data circuit of the module that you cannot communicate with for an open. Fault found and corrected?	-	Go to step 7	Go to step 5
5	Inspect the wiring harness connectors of the module with which communication cannot be established for tightness of connections and elasticity of contacts in the following circuits: Battery positive voltage input circuits Battery Positive Voltage Output Circuits Ignition voltage input circuits Ignition voltage output circuits Switched Battery Positive Voltage Power Circuits Grounding circuits GMLAN High Speed Serial Data Circuits Fault found and corrected?	-	Go to step 7	Go to step 6
6	Replace the module that cannot be communicated with. Has the replacement been made?	-	Go to step 7	-
7	Clear the DTCs with a scan tool. Switch off the ignition for 30 seconds. Start the engine. Create conditions for the vehicle to set the DTC. You can also create conditions for the vehicle that have been observed based on status records/fault logs. Did the DTC indicate a misfire?	-	Go to step 2	Go to step 8
8	Check for additional DTCs set. Are there any DTCs that have not yet been diagnosed?	-	Jump to the appropriate DTC table	System OK

• Ignition switch in the on position.

• The ECM is receiving incorrect transmission related data from the TCM.

• DTC U0402 is a Type C DTC.

• DTC U0402 is a Type C DTC.

Step	Operation	Values	Yes	No
1	Have you performed a diagnostic system check?	-	Go to step 2	Go to item "Diagnostic system check".
2	Turn the ignition switch to the LOCK position. Connect the scan tool to the diagnostic terminal. Turn the ignition key to the ON position. Observe DTC data with a scan tool. Are any other DTCs displayed other than U0442?	-	Jump to the appropriate DTC table	Go to step 3
3	Clear the DTCs with a scan tool. Switch off the ignition for at least 30 seconds. Start the engine and let it idle. Did DTC U0402 occur during this ignition cycle?	-	Go to step 7	See Intermittent Faults"
4	Have any other TCM related DTCs or other DTCs been set? "U"?	-	Jump to the appropriate DTC table	Go to step 5
5	Check the LAN circuits in the harness between the TCM and the ECM for high resistance or poor connections at the module connectors. Fault found and corrected?	-	Go to step 7	Go to step 6
6	Replace the ECM. Has the replacement been made?	-	Go to step 7	-
7	Clear the DTCs with a scan tool. Switch off the ignition for 30 seconds. Start the engine. Create conditions for the vehicle to set the DTC. You can also create conditions for the vehicle that have been observed based on status records/fault logs. Did the DTC indicate a misfire?	-	Go to step 2	Go to step 8
8	Check for additional DTCs set. Are DTCs displayed that were not diagnosed?	-	Jump to the appropriate DTC table	System OK