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Captiva 1 (2006-2018)
  • Home
  • Captiva
  • 2006-2018
  • Engine FAM II 2.4D
  • Control and power systems

Diagnostics of signs of malfunctions of the engine management system

            0

Important Preliminary Checks



Important: Some symptoms require a thorough visual/physical examination. Always perform a visual/physical check first. Visual checks can lead to the problem being fixed without further checks and save valuable time.


Step Operation Values Yes No
1
Perform a diagnostic system check.
Any diagnostic codes (DTC) stored in the memory of the electronic engine management system controller (ECM)?
-
Jump to the appropriate DTC table
Go to operation 2
2
  1. Check all ground connections to the ECM.
  2. Check all vacuum hoses for cracks, kinks and tight connections.
  3. Check for air leaks at all mounting points of the intake manifold sealing surfaces.
  4. Check all ignition wires for kinks, stiffness, correct routing and signs of breakdown.
  5. Inspect the wiring harness for loose connections, pinches, or cuts.
Are all checks completed?
-
Jump to the relevant symptom table
-


Intermittent malfunctions; Intermittent trouble codes



Definition: The problem may or may not illuminate the MIL or store a DTC.

Important: Do not use DTC tables for intermittent faults (DTC). The fault must be present to isolate the problem. If the problem is intermittent, use of the DTC tables may result in the replacement of serviceable parts.


Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
  1. Conduct a thorough check of questionable circuits.
  2. Check the connection of the connector parts or the fit of the terminals in the connector housing.
  3. Check for deformation or damage to the terminals.
  4. Check for loose terminal connections to wires. To check, you need to remove the terminal from the connector housing.
Are there any problems?
-
Go to operation 3
Go to operation 4
3
Repair electrical connectors if necessary.
Has the renovation been completed?
-
System OK
-
4
Run a road test with a voltmeter connected to the suspect circuit or with a scan tool connected to the diagnostic terminal.
Did the voltmeter or scan tool show abnormal voltage or scanned value?
-
Go to operation 5
Go to operation 6
5
Replace the sensor in the circuit for which the DTC was stored.
Has the renovation been completed?
-
System OK
-
6
Is the Malfunction Indicator Lamp (MIL) showing an intermittent fault or is a DTC set?
-
Jump to Operation 7
Jump to operation 8
7
  1. Check the relay, ECM controlled solenoid valve, and switches.
  2. Check the correct installation of electrical devices such as lights, radio transmitters, electric motors, etc.
  3. Check ignition control wires for proper routing (away from ignition wires, ignition system components and alternator).
  4. Check for a short to ground in the MIL circuit or "test" diagnostic block terminals.
  5. Check all ECM ground connections.
  6. Troubleshoot or repair related circuits as needed.
Has the renovation been completed?
-
System OK
-
8
  1. Check the memory of the diagnostic trouble code.
  2. Disconnect the throttle position sensor.
  3. Run the engine at idle speed until the malfunction indicator lamp comes on.
  4. Switch off the ignition.
Is DTC P0122 stored in memory?
-
Jump to operation 10
Go to operation 9
9
Replace the ECM.
Has the renovation been completed?
-
System OK
-
10
Does the car stall while driving?
-
Go to operation 11
Go to operation 12
11
Check the duration of the reference pulse of the injectors and the oxygen sensor with a scanning tool.
Scan Tool Indicates Constant Low Voltage (about 0 mV) for the oxygen sensor at a given value of the duration of the reference pulse supplied by the control module to the injector?
8 ms
Go to operation 9
Go to operation 12
12
  1. Check for an open diode in the A/C clutch and other open diodes.
  2. Repair or replace components as necessary.
Has the renovation been completed?
-
System OK
-


Difficult start



Definition: The engine cranks normally, but the engine does not start for a long time. The engine sometimes runs or may start and immediately stall.


Important: Make sure the startup scheme uses the correct startup procedure. Check for service bulletin updates before diagnosing.


Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
  1. Connect the scan tool to the diagnostic terminal.
  2. Using a scan tool, check the engine coolant temperature sensor and the intake air temperature sensor.
  3. Compare the coolant temperature and intake air temperature with the ambient temperature on a cold engine.
Are the coolant and intake air temperature sensors readings greater than the ambient temperature readings?
5°F (3°C)
Go to operation 3
Go to operation 4
3
  1. Measure the resistance of the coolant temperature sensor and the intake air temperature sensor.
  2. Compare the resistance value to specifications using the temperature and resistance comparison tables for DTCs P0118 and P0113.
  3. If the resistance is not the same, replace the faulty sensor.
Has the renovation been completed?
-
System OK
-
4
  1. Check for a stuck throttle shaft or limit lever, which may be causing the throttle position sensor signal to be high. Repair or replace if necessary.
  2. Check the signal strength from the throttle sensor when the throttle is closed.
Is the measured signal level within the set value?
0.4-0.8V
Go to operation 5
Go to operation 26
5
  1. Check the response and accuracy of the manifold absolute pressure sensor.
  2. Replace the manifold absolute pressure sensor if necessary.
Has the renovation been completed?
-
System OK
Go to operation 6
6
Check fuel pump operation.
Does the fuel pump run for the set time when the ignition key is turned on?
2 sec.
Jump to Operation 7
Go to section "Checking the relay circuit of the electric fuel pump"
7
Check the pressure in the fuel supply system.
Is the fuel pressure within specifications?
410 kPa
Jump to operation 8
Go to operation 27
8
Check for water in fuel.
Fuel contaminated?
-
Go to operation 9
Jump to operation 10
9
Replace contaminated fuel.
Has the renovation been completed?
-
System OK
-
10
  1. Check the fuel injector driver circuit.
  2. Disconnect the wiring harness connectors from all fuel injectors.
  3. Connect an injector test lamp between the harness terminals of each fuel injector connector.
  4. Pay attention to the control lamp when turning the crankshaft.
Is the control lamp flashing at all connectors?
-
Jump to operation 13
Go to operation 11
11
Check fuel injector driver harness, connectors and connector terminals for good contact.
Fault found?
-
Go to operation 12
Jump to operation 28
12
Repair wiring harness, connector or connector terminal as needed.
Has the renovation been completed?
-
System OK
 -
13
Measure the resistance at each fuel injector.
Whether the resistance of the fuel injector is within the set value (68°F [20°C] - resistance increases slightly at higher temperatures)?
11.6-12.4 ohm
Jump to operation 15
Go to operation 14
14
Replace fuel injector with resistance out of specification.
Has the renovation been completed?
-
System OK
-
15
Run injector diagnostics.
Fault found?
-
Jump to operation 16
Go to operation 17
16
Replace clogged or leaking fuel injectors as needed.
Has the renovation been completed?
-
System OK
-
17
  1. Check for proper ignition output voltage at each cylinder using a spark tester.
  2. Check spark plugs for cracks, wear, improper gap, burnt electrodes, or significant deposits.
  3. Check ignition wires for short circuits.
  4. Check all ignition ground wires for loose connections.
  5. Check the accuracy of the ECM.
Fault found?
-
Go to operation 18
Jump to operation 19
18
Repair or replace faulty ignition components.
Has the renovation been completed?
-
System OK
-
19
Does the engine misfire or cut off fuel under load or at idle?
 -
Go to section "Checking the ignition system"
Jump to operation 20
20
Does the engine start but then immediately stall?
-
Jump to Operation 21
Jump to operation 23
21
  1. Remove crankshaft position sensor (CKP).
  2. Check for faulty connections and repair if necessary.
Fault found?
-
Go to operation 22
Jump to operation 25
22
Repair faulty connections if necessary.
Has the renovation been completed?
-
System OK
-
23
  1. Check valve timing.
  2. Check cylinder compression.
  3. Check the valve lifters, rockers, valve springs and camshaft lobes for excessive wear.
  4. Check intake manifold and exhaust manifold passages for burrs.
Fault found?
-
Jump to Operation 24
Jump to operation 25
24
Repair or replace components as needed.
Has the renovation been completed?
-
System OK
-
25
Check the operation of the idle control system. Repair or replace components as needed.
Has the renovation been completed?
-
System OK
-
26
Test the throttle position sensor circuit for proper operation. Repair or replace components as needed.
Has the renovation been completed?
-
System OK
-
27
Repair the fuel system if necessary.
Has the renovation been completed?
-
System OK
-
28
Replace the ECM.
Has the renovation been completed?
-
System OK
-


Pops or shots in the silencer



Definition: Change in engine power at constant throttle or cruise control. There is a set and a decrease in speed by the car without changing the position of the gas pedal.


Important: The driver needs to properly understand the operation of the air conditioning compressor, as described in the owner's manual.


The speedometer reading and the speed reading on the scan tool must be the same.

Check for service bulletin updates before diagnosing.

Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
Connect the scan tool to the diagnostic terminal.
oxygen sensor (O2S) responds quickly to various throttle positions?
-
Go to operation 4
Go to operation 3
3
  1. Check the O2S sensor for silicone or other fuel contaminants, or use an appropriate adhesive/sealant.
  2. Replace dirty O2S sensor.
Has the renovation been completed?
-
System OK
-
4
  1. Test the vehicle while driving at the speed at which the malfunction occurs.
  2. Check the Long Term Fuel Trim reading with a scan tool.
Is the Long Term Fuel Trim reading within the set value?
-20-20%
Jump to Operation 7
Go to operation 5
5
Is the long-term fuel trim reading below the set value?
-20%
Go to section Diagnostic Information for DTC P2178"
Go to operation 6
6
Is the long-term fuel trim reading higher than the set value?
20%
Go to section Diagnostic Information for DTC P2177"
-
7
Check the pressure in the fuel supply system under the existing condition.
Is the fuel pressure within specifications?
410 kPa
Jump to operation 8
Go to operation 17
8
Check built-in fuel filter.
Is the filter dirty or clogged?
-
Go to operation 18
Go to operation 9
9
Run injector diagnostics.
Did the injector diagnostics reveal the problem?
-
Jump to operation 19
Jump to operation 10
10
  1. Check for proper ignition output voltage with a spark tester.
  2. Check spark plugs for cracks, wear, improper gap, burnt electrodes, or significant deposits.
Fault found?
-
Go to operation 11
Go to operation 12
11
Repair or replace ignition system components as needed.
Has the renovation been completed?
-
System OK
-
12
  1. Check the ECM grounding for cleanliness, tightness, and proper placement.
  2. Check vacuum hoses for kinks or leaks.
Fault found?
-
Jump to operation 13
Go to operation 14
13
Repair the electrical components of the vacuum lines as necessary.
Has the renovation been completed?
-
System OK
-
14
Check generator output voltage.
Is the alternator voltage within the specified value?
12-16V
Jump to operation 16
Jump to operation 15
15
Repair generator.
Has the renovation been completed?
-
System OK
-
16
  1. Check for erratic operation of the EGR valve.
  2. Repair or replace components as necessary.
Has the renovation been completed?
-
System OK
-
17
Repair the fuel system if necessary.
Has the renovation been completed?
-
System OK
-
18
Replace fuel filter.
Has the renovation been completed?
-
System OK
-
19
Replace clogged or leaking fuel injectors.
Has the renovation been completed?
-
System OK
-


Lack of power and throttle response, soft pedal effect



Definition: The engine develops less power than expected. The vehicle accelerates little or no acceleration when the accelerator pedal is depressed partially.


Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
  1. Make sure the customer's complaint is validated.
  2. Compare the characteristics of the customer's vehicle with those of the same vehicle.
Does the problem exist?
-
Go to operation 3
System OK
3
  1. Inspect the air filter for excessive dirt.
  2. Replace air filter if necessary.
  3. Check transmission shift pattern and downshifting.
Is the gearbox working correctly?
-
Go to operation 4
Go to operation 5
4
Check the pressure in the fuel supply system.
Is the fuel pressure within specifications?
410 kPa
Jump to Operation 7
Go to operation 6
5
Repair gearbox if necessary.
Has the renovation been completed?
-
System OK
-
6
Repair the fuel system if necessary.
Has the renovation been completed?
-
System OK
-
7
Check for clogged fuel filter or fuel contamination.
Fault found?
-
Jump to operation 8
Go to operation 9
8
Repair or replace components as necessary.
Has the renovation been completed?
-
System OK
-
9
  1. Check the ignition output voltage on each cylinder using a spark tester.
  2. Check ignition adjustment.
Is the ignition system working correctly?
-
Jump to operation 10
Go to operation 11
10
  1. At normal engine operating temperature, connect a vacuum gauge to the intake manifold vacuum connection.
  2. Let the engine run at 1000 rpm.
  3. Write down the vacuum values.
  4. Raise the engine speed to 2500 rpm.
  5. Record the vacuum reading at 2500 rpm.
Is the vacuum reduced by more than the set value?
10 kPa (3 inch Hg)
Go to operation 12
Jump to operation 15
11
Repair or replace ignition system components as needed.
Has the renovation been completed?
-
System OK
-
12
Check the exhaust system for clogged, broken or kinked pipes.
Fault found?
-
Jump to operation 13
Go to operation 14
13
Repair or replace components as needed.
Has the renovation been completed?
-
System OK
-
14
  1. Check cylinder compression and valve timing.
  2. Check camshaft for excessive wear.
Fault found?
-
Jump to operation 15
Jump to operation 16
15
Repair or replace engine components as needed.
Has the renovation been completed?
-
System OK
-
16
  1. Check the ECM ground connections to ensure they are clean, tight, and in the correct location.
  2. Check if the exhaust gas recirculation valve opens all the time or partially?
  3. Check the operation of the torque converter clutch.
  4. Check the functioning of the air conditioning system.
  5. Check generator output power.
  6. Repair the generator if the output power is out of range.
Are all checks and repairs completed?
12-16V
System OK
-


Detonation / detonation during sparking



Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
  1. Fill the fuel tank with approved, high quality octane gasoline as directed.
  2. Re-evaluate the performance of the car.
Does the detonation problem persist?
Octane number 87-89
Go to operation 3
System OK
3
  1. Check for low engine coolant level.
  2. Check if the air flow to the radiator is obstructed or the coolant flow is restricted.
  3. Check the thermostat.
  4. Check the quality of the coolant solution.
Fault found?
-
Go to operation 4
Go to operation 5
4
If necessary, repair or replace cooling system components.
Has the renovation been completed?
-
System OK
-
5
  1. Using a scan tool, check the engine coolant temperature.
  2. Replace coolant temperature sensor (ECT), if the resistance is not within the limits specified in section "Diagnostic Information" to DTC P0118.
Fault found?
-
Go to operation 6
Jump to Operation 7
6
Replace the engine coolant temperature sensor or repair the circuit as needed.
Has the renovation been completed?
-
System OK
-
7
  1. Check ignition output voltage with a spark tester.
  2. Check heating zone and spark plug gap.
  3. Check the operation of the ignition control units.
Is the ignition system working correctly?
-
Go to operation 9
Jump to operation 8
8
If necessary, repair or replace ignition system components.
Has the renovation been completed?
-
System OK
-
9
  1. Connect the scan tool to the diagnostic terminal.
  2. Test the vehicle while driving at the speed at which the malfunction occurs.
  3. Check the Long Term Fuel Trim readings on the scan tool data stream.
Is the long-term fuel trim reading higher than the set value?
20%
Go to section Diagnostic Information for DTC P2177"
Jump to operation 10
10
Check the pressure in the fuel supply system.
Fault found?
410 kPa
Go to operation 11
Go to operation 12
11
If necessary, repair or replace fuel system components.
Has the renovation been completed?
-
System OK
-
12
  1. Check if carbon deposits have formed inside the engine.
  2. Remove carbon deposits with a high quality engine cleaner. Follow the instructions given for this product.
  3. Check the main components - camshaft, cylinder head, pistons, etc. - wear.
  4. Replace badly worn parts.
Is the procedure completed?
-
Jump to operation 13
-
13
  1. Check the operation of the exhaust gas recirculation valve.
  2. Check the operation of the air intake system.
  3. Check the operation of the torque converter clutch and transmission shift points.
  4. Check service bulletins for updates to persistent storage (PROM).
  5. Check cylinder compression.
  6. Repair or replace any defective components.
Are all checks and repairs completed?
-
System OK
-


Delays, dips, jerks



Definition: Lack of immediate response when pressing the accelerator pedal. This can happen at any vehicle speed. This is usually most pronounced when trying to start off. Sufficiently strong delays, dips or jerks can cause the engine to stop.


Important: Before diagnosing this condition, check for service bulletin updates for the PROM.


Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
  1. Check the pressure in the fuel supply system. If the pressure is out of specification, service the fuel system as needed.
  2. Check for stuck or restricted throttle position sensor. The throttle position sensor signal should increase evenly as the throttle is moved to the fully open position.
Fault found?
410 kPa
Go to operation 3
Go to operation 4
3
Repair or replace components as necessary.
Has the renovation been completed?
-
System OK
-
4
  1. Check the response and accuracy of the manifold absolute pressure sensor.
  2. Check fuel for water.
  3. Check the operation of the evaporative emission system (SUPS).
Fault found?
-
Go to operation 5
Go to operation 6
5
Repair or replace components as needed.
Has the renovation been completed?
-
System OK
-
6
  1. Disconnect the harness connectors for all fuel injectors.
  2. Connect an injector test lamp between each fuel injector harness terminals.
  3. Pay attention to the control lamp when turning the crankshaft.
Is the control lamp flashing at all connectors?
-
Jump to operation 8
Jump to Operation 7
7
  1. Repair or replace a faulty fuel injector actuator harness, connector, or connector terminal.
  2. If the connections and wiring harness are OK, replace the ECM.
Has the renovation been completed?
-
System OK
-
8
Measure the resistance at each fuel injector.
Fuel injector resistance within the set value (resistance will increase slightly at higher temperature)?
11.6-12.4 ohm
Jump to operation 10
Go to operation 9
9
Replace fuel injector with resistance out of specification.
Has the renovation been completed?
-
System OK
-
10
Run injector diagnostics.
Fault found?
-
Go to operation 11
Go to operation 12
11
Replace clogged or leaking fuel injectors.
Has the renovation been completed?
-
System OK
-
12
Check the pressure in the fuel supply system after a cold start or during moderate or full throttle opening.
Is the fuel pressure within specifications?
410 kPa
Go to operation 14
Jump to operation 13
13
Repair obstruction in fuel system or replace faulty fuel pump.
Has the renovation been completed?
-
System OK
-
14
  1. Check the condition of the spark plugs.
  2. Check the ignition output voltage on each cylinder using a spark tester.
Fault found?
-
Jump to operation 15
Jump to operation 16
15
Repair or replace ignition system components as needed.
Has the renovation been completed?
-
System OK
-
16
  1. Check generator output voltage.
  2. Repair or replace the generator if the output power is less than the specified value
  3. Check the operation of the exhaust gas recirculation valve.
Have all checks and necessary repairs been completed?
12-16 V
System OK
-


Interruptions in the engine; Delays, failures



Definition: A constant pulsing or jerking that increases as the load on the engine increases. Exhaust gases constantly hiss at idle or low speeds.

Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
Check the ignition output voltage on each cylinder using a spark tester.
Is there spark on all cylinders?
-
Go to operation 3
Go to section "Checking the ignition system"
3
Check spark plugs for excessive wear, insulation breakdown, incorrect gap, or heavy deposits.
Fault found?
-
Go to operation 4
Go to operation 5
4
Repair or replace components as needed.
Has the renovation been completed?
-
System OK
-
5
  1. Perform a cylinder compression test.
  2. If compression is low, repair engine if necessary.
  3. Check for valve timing, bent valve lifters, worn rockers, broken or loose valve springs, and worn camshaft lobes.
  4. Check intake manifold and exhaust manifold passages for burrs.
Fault found?
-
Go to operation 6
Jump to Operation 7
6
Repair or replace components as needed.
Has the renovation been completed?
-
System OK
-
7
  1. Check the fuel system for clogging of the built-in fuel filter.
  2. Check the fuel system for low fuel pressure. If the fuel pressure is below the specified value, service the fuel system if necessary.
  3. Check fuel contamination.
Fault found?
410 kPa
Jump to operation 8
Go to operation 9
8
Repair or replace components as needed.
Has the renovation been completed?
-
System OK
-
9
  1. Disconnect the wiring harness connectors from all fuel injectors.
  2. Connect an injector test lamp to the harness terminals of each fuel injector connector.
  3. Pay attention to the control lamp when turning the crankshaft on each fuel injector.
Does the warning light flash on all fuel injectors?
-
Go to operation 11
Jump to operation 10
10
  1. Repair or replace a faulty injector drive circuit harness, connector, or connector terminal.
  2. If the connections and wiring harness are OK, replace the ECM.
Has the renovation been completed?
-
System OK
-
11
Measure the resistance at each fuel injector.
Nozzle resistance within the set value (resistance will increase slightly at higher temperature)?
11.6-12.4 ohm
Jump to operation 13
Go to operation 12
12
Replace fuel injectors with resistance out of specification.
Has the renovation been completed?
-
System OK
-
13
Run injector diagnostics.
Fault found?
-
Go to operation 14
Jump to operation 15
14
Replace clogged or leaking fuel injectors.
Has the renovation been completed?
-
System OK
-
15
  1. Check for electromagnetic interference.
  2. Check engine RPM with a scan tool.
Does the RPM reading on the scan tool change much with a small change in actual engine RPM?
-
Jump to operation 16
-
16
  1. Check ignition wiring.
  2. Check all earth connections of the ignition system.
  3. Fix gasket or repair ground connections as needed.
Have all checks and necessary repairs been completed?
-
System OK
-


High fuel consumption



Definition: Fuel economy measured in sea trials is significantly lower than expected. Also, fuel economy is well below that measured in previous sea trials.

Important: Driving skills affect fuel economy. Ask the following questions to the client regarding driving skills:


1. Air conditioning system (e.g. heating mode) always enabled?

2. Are the tires inflated to the correct pressure?

3. Is the vehicle used to carry heavy loads?

4. Does the driver perform too strong and frequent accelerations? Advise the driver to read the section on fuel economy in the owner's manual.

Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
  1. Inspect the air filter for excessive dirt.
  2. Check fuel system for leaks.
Have all the required checks been completed?
-
Go to operation 3
-
3
  1. Check spark plugs for excessive wear, insulation breakdown, incorrect gap, or heavy deposits.
  2. Replace all defective spark plugs.
Have all the necessary checks and repairs been completed?
-
Go to operation 4
-
4
  1. Check coolant level.
  2. Check if the thermostat is open all the time and check the heating range.
  3. Replace thermostat if necessary.
Have all the necessary checks and repairs been completed?
-
Go to operation 5
-
5
  1. Check transmission shift pattern. Make sure all gears are working.
  2. Check speedometer calibration.
  3. Check for sticking brakes.
  4. Check cylinder compression.
  5. Repair, replace, or adjust components as needed.
Have all checks and necessary repairs been completed?
-
System OK
-


Erratic operation or stalling at idle



Definition: The engine runs rough at idle. If this condition is severe, the car may shake. The idle speed also changes (engine "floats"). Either condition may be sufficient to stop the engine. The engine is running at the wrong idle speed.

Important: Check for service bulletin updates before diagnosing.


Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
  1. Connect the scan tool to the diagnostic terminal.
  2. Check oxygen sensor readings (O2S) at different throttle positions.
Does the O2S switch quickly from rich to lean at various throttle positions?
-
Go to operation 5
Go to operation 3
3
Check O2S sensor for fuel contamination or improper use of RTV sealant (sealant that cures at room temperature).
Is the O2S sensor dirty?
-
Go to operation 4
Go to operation 5
4
If necessary, replace a contaminated O2S sensor.
Has the renovation been completed?
-
System OK
-
5
  1. Check for a stuck throttle shaft or limit lever, which may be causing an incorrect throttle position sensor signal level.
  2. Check the signal strength from the throttle sensor when the throttle is closed.
Is the throttle position sensor signal level within the specified value?
0.4-0.8V
Go to operation 6
Go to section Diagnostic Information for DTC P0123"
6
  1. Using a scan tool, check the reading of the coolant temperature sensor.
  2. Compare readings of the coolant temperature sensor with the ambient temperature on a cold engine.
Does the coolant temperature sensor reading differ from ambient temperature by more than specified?
5°F (3°C)
Jump to Operation 7
Go to operation 9
7
Check for high resistance in the coolant temperature sensor circuit or in the sensor itself.
Fault found?
-
Jump to operation 8
Go to operation 9
8
Replace the engine coolant temperature sensor or repair the circuit as needed.
Has the renovation been completed?
-
System OK
-
9
Check the response and accuracy of the manifold absolute pressure sensor.
Fault found?
-
Jump to operation 10
Go to operation 11
10
Replace the manifold absolute pressure sensor or troubleshoot the sensor circuit as needed.
Has the renovation been completed?
-
System OK
-
11
  1. Test the vehicle while driving at the speed at which the malfunction occurs.
  2. Check the Long Term Fuel Trim reading with a scan tool.
Is the Long Term Fuel Trim reading within the set value?
-20-20%
Go to operation 14
Go to operation 12
12
Is the long-term fuel trim reading below the set value?
-20%
Go to section Diagnostic Information for DTC P2178"
Jump to operation 13
13
Is the long-term fuel trim reading higher than the set value?
20%
Go to section Diagnostic Information for DTC P2177"
-
14
  1. Disconnect the wiring harness connectors from all fuel injectors.
  2. Connect an injector test lamp between the harness terminals of each fuel injector connector.
  3. Pay attention to the control lamp when turning the crankshaft.
Does the warning light flash on all fuel injectors?
-
Jump to operation 16
Jump to operation 15
15
  1. Replace the faulty fuel injector actuator harness, connector, or connector terminal.
  2. If the wiring harness, connectors and terminals are OK, replace the ECM.
Has the renovation been completed?
-
System OK
-
16
Measure the resistance of each fuel injector.
Resistance within the set value (resistance will increase slightly at higher temperature)?
11.6-12.4 ohm
Go to operation 18
Go to operation 17
17
Replace fuel injectors with resistance out of specification.
Has the renovation been completed?
-
System OK
-
18
Run injector diagnostics.
Fault found?
-
Jump to operation 19
Jump to operation 20
19
Replace clogged or leaking fuel injectors as needed.
Has the renovation been completed?
-
System OK
-
20
  1. With the engine off, disconnect the fuel pressure regulator vacuum hose.
  2. Carefully inspect the fuel pressure regulator vacuum tube and fuel pressure regulator vacuum hose for fuel.
Fault found?
-
Jump to Operation 21
Go to operation 22
21
Replace fuel pressure regulator if necessary.
Has the renovation been completed?
-
System OK
-
22
  1. Check the ignition output voltage on each cylinder using a spark tester.
  2. Check spark plugs for excessive wear, insulation breakdown, incorrect gap, or heavy deposits.
  3. Check the ignition wires for breaks, rigidity and correct connection.
Fault found?
-
Jump to operation 23
Jump to Operation 24
23
Repair or replace ignition system components as needed.
Has the renovation been completed?
-
System OK
-
24
  1. Check for leaks in vacuum lines.
  2. Check operation of forced crankcase ventilation.
  3. Check the operation of the idle air control valve.
  4. Check all ECM ground connections.
Fault found?
-
Jump to operation 25
Go to operation 26
25
Repair or replace components as necessary.
Has the renovation been completed?
-
System OK
-
26
  1. Check the operation of the exhaust gas recirculation valve.
  2. Check the battery wires and mounting brackets on the case for tight connections.
  3. Check generator output voltage. Repair or replace the alternator if the output voltage is out of specification?
Fault found?
12-16 V
Go to operation 27
Jump to operation 28
27
Repair or replace components as necessary.
Has the renovation been completed?
-
System OK
-
28
  1. Check the condition of the engine mounts.
  2. Check valve timing.
  3. Perform a cylinder compression test.
  4. Check for bent valve lifters, worn rockers, broken or loose valve springs, and a worn camshaft.
  5. Make repairs if necessary.
Have all checks and necessary repairs been completed?
-
System OK
-


Increased toxicity or unpleasant smell of exhaust gases



Definition: The vehicle does not pass an emission test. The car smells strongly of rotten eggs. Excessive odor does not necessarily mean excessive toxicity.

Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
  1. Start the engine and let it warm up to operating temperature.
  2. Perform an exhaust emission test.
Has the car been tested for toxicity?
-
System OK
Go to operation 3
3
  1. Connect the scan tool to the diagnostic terminal.
  2. Carry out a test drive.
  3. Check the long-term fuel trim memory.
Is the long-term fuel trim memory within the set value?
-20-20%
Go to operation 6
Go to operation 4
4
Is the long-term fuel trim memory below the set value?
-20%
Go to section Diagnostic Information for DTC P2178"
Go to operation 5
5
Is the long-term fuel trim reading higher than the set value?
20%
Go to section Diagnostic Information for DTC P2177"
-
6
  1. Check that the fuel tank cap is installed correctly.
  2. Check the pressure in the fuel supply system.
  3. Run injector diagnostics.
Fault found?
-
Jump to Operation 7
Jump to operation 8
7
  1. Repair or replace fuel system components as needed.
  2. Perform an exhaust emission test.
Has the car been tested for toxicity?
-
System OK
-
8
  1. Check the operation of the ignition system.
  2. Check spark plugs for excessive wear, insulation breakdown, incorrect gap, or heavy deposits.
Fault found?
-
Go to operation 9
Jump to operation 10
9
  1. Repair or replace ignition system components as needed.
  2. Perform an exhaust emission test.
Has the car been tested for toxicity?
-
System OK
-
10
  1. Check for leaks in vacuum lines.
  2. Check catalytic converter for contamination.
  3. Check for deposits on the throttle body and in the throttle valve and inside the engine. Remove the upper engine cleaner.
  4. Check if the EGR valve opens.
  5. Check operation of forced crankcase ventilation.
Have all checks and necessary repairs been completed?
-
System OK
-


Self-ignition by compression



Definition: The engine continues to run after the ignition is turned off.

Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
Does the engine run smoothly after the ignition is turned off?
-
Go to operation 3
Go to operation 4
3
  1. Check the ignition switch and its adjustment.
  2. Replace ignition switch if necessary.
Has the renovation been completed?
-
System OK
-
4
  1. Check the EVAP system.
  2. Check fuel injector leaks.
  3. Check the operation of the idle air control valve.
  4. Check for leaks in vacuum lines.
  5. Check basic idle settings.
Are all checks and repairs completed?
-
System OK
-


Backfire



Definition: Fuel ignites in the intake manifold or exhaust system, producing pops.

Important: Check for service bulletin updates before diagnosing.


Step Operation Values Yes No
1
Have important preliminary checks been carried out?
-
Go to operation 2
Go to section "Important Preliminary Checks"
2
  1. Check the spark plugs for the occurrence of sparks in them from mutual influence.
  2. Check the ignition output voltage on each cylinder using a spark tester.
  3. Check spark plugs for excessive wear, incorrect gap, burnt electrodes, or significant deposits.
Fault found?
-
Go to operation 3
Go to operation 4
3
Repair or replace ignition system components as needed.
Has the renovation been completed?
-
System OK
-
4
  1. Check fuel system operation.
  2. Diagnose fuel injectors.
Fault found?
-
Go to operation 5
Go to operation 6
5
Repair or replace fuel system components as needed.
Has the renovation been completed?
-
System OK
-
6
  1. Check the EGR gasket for leaks or a loose fit.
  2. Check the operation of the exhaust gas recirculation valve.
  3. Check intake manifold and exhaust manifold for burrs.
Fault found?
-
Jump to Operation 7
Jump to operation 8
7
Repair or replace components as needed.
Has the renovation been completed?
-
System OK
-
8
  1. Check engine compression.
  2. Check intake manifold and exhaust manifold for leaks.
  3. Check for stuck or leaking valves.
  4. Repair or replace components as needed.
Are all checks and repairs completed?
-
System OK
-

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Previous articles
Captiva 1: Control and power systems
Next articles

Diagnostic Trouble Codes (DTCs) (end)
Diagnostic Trouble Codes DTC (beginning)
Definitions of types of diagnostic trouble codes
Fuel system diagnostics
Diagnostics of the engine management system
Location of components of engine management systems
Blocks of electrical connectors
The electrical circuit of the controller of the engine management system
Table of special tools
Dependence of resistance of sensors on temperature
Relieving pressure in the fuel supply system
Fuel pressure check
Removal and installation of the fuel tank
Fuel pump assembly
Fuel level sensor
Fuel filter
Fuel rail and injectors
Coolant temperature sensor (ECT)
Electronic throttle body
Control oxygen sensor (with electric heater)


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Captiva 1 (2006-2018) 
  • Manual
  • Before leaving
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  • Driving a car
  • Car care
  • Maintenance
  • Engine 2.0 l (diesel)
  • Engine device
  • Troubleshooting
  • Engine repair
  • Cooling system
  • Engine electrical equipment
  • Control and power systems
  • Exhaust system
  • Engine FAM II 2.4D
  • Engine device
  • Troubleshooting
  • Engine repair
  • Cooling system
  • Engine electrical equipment
  • Control and power systems
  • Exhaust system
  • Engine HFV6 3.2L
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  • Engine repair
  • Cooling system
  • Engine electrical equipment
  • Control and power systems
  • Exhaust system
  • Transmission
  • Front drive axle
  • Rear drive axle
  • Automatic gearbox - device
  • Automatic gearbox - service
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  • Manual gearbox - device
  • Manual gearbox - service and repair
  • Clutch
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  • Interior (internal elements)
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  • Doors and windows
  • Electrical equipment
  • Equipment and devices
  • Lighting and lamps
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  • Electrical circuits

 

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