Decreased vehicle exhaust emissions Chevrolet Lumina 1

Exhaust emission control systems
To prevent pollution of the atmosphere by products of incomplete combustion and evaporation, to ensure the acceleration of the car and save fuel, several...

Location of elements of the toxicity reduction system
2.1a. The location of the elements of the toxicity reduction system on the 3.1 l engine: 1 - air filter housing, 2 - throttle position sensor (TPS), 3 -...

Computer command control system (CCS) and fault codes
Computer command control system (CCC) consists of an electronic unit (ECM on 3.1L engine; PCM on 3.8L engine) and information sensors that monitor various...

ECM PROM (3.1L) and PCM MEM-CAL (3.8L)
Removing the ECM/PCM 1. ECM electronic control unit (PCM control unit) located in the car under the dashboard (Right side). 2. Disconnect the wires from the...

Coolant temperature sensor
General description 1. The coolant temperature sensor is a thermistor (resistor that changes resistance value with temperature). Changing the resistance values...

Air mass sensor (MAP) (3.1L engine)
General description 6. MAP sensor (see illustration) monitors changes in manifold pressure that are associated with changes in load and engine speed, and...

Oxygen sensor — check and replace
General description and verification 9. Oxygen sensor located in the exhaust manifold (see illustration), carries out current monitoring of the oxygen content...

Throttle Position Sensor (TPS)
General description Throttle position sensor (TPS) located on the throttle shaft shank on the throttle body. By continuously monitoring the output voltage from...

Gear lever neutral position sensor
General description 30. The park/neutral position sensor located on the transmission provides information to the ECM/PCM when the shift lever is in neutral...

Air conditioning control
Air conditioning compressor clutch control Note. Refer to illustrations 6.2a and 6.2b c to determine relay installation locations section 6 chapter 12 . 44....

Vehicle Speed Sensor (VSS)
General description 49. Vehicle speed sensor (VSS) located in the casing directly above the gearbox on the right side (see illustrations). It sends a pulsed...

MAF air flow sensor (on 3.8L engine)
General description 53. Air flow sensor (MAF) located in the throttle body next to the intake manifold. This sensor is used to measure the amount of air...

Camshaft position sensor (on 3.8L engine)
Note. For more information regarding the camshaft position sensor electrical circuit, refer to chapter 5 in illustration 9.21b . General description 62. The...

Crankshaft position sensor (for 3.8L engine)
General description 74. The crankshaft position sensor is mounted on an aluminum bracket and is attached to the front left of the timing chain cover. Partially...

Intake air temperature (IAT) sensor (for 3.8L engine)
General description 95. The intake air temperature sensor is located inside the air intake directly behind the air filter housing. This sensor works like a...

Knock sensor — general description
The knock sensor is located in the cylinder block behind the oil filter. The sensor performs the main function in the electronic ignition control system (ESC)....

Electronic ignition timing (EST)
3.1L engine General description 1. ECM electronic control unit (or PCM transmission control unit) controls the ignition timing set by the distributor (ignition...

Electronic ignition control (ESC) or with knock sensor (KS)
Electronic ignition timing system (ESC) (for engines 1990-1992 release) or system with knock sensor (KS) (for engines produced since 1993). Note. In 1993, the...

Exhaust gas recirculation system (EGR 3.1L and 3.8L since 1993)
Note. On engines of 3.8 liters of release 1990-1992. the EGR system was not installed. Engines with a displacement of 3.1 liters (EGR vacuum valve) General...

Gasoline Evaporation Control System (EECS)
General description 1. This system is designed to capture and accumulate fuel vapors evaporating from the gas tank, throttle body and intake manifold. 2....

Positive crankcase ventilation (PCV)
1. Forced crankcase ventilation system (PCV) serves to reduce the content of hydrocarbons in exhaust gases by removing vapors from the engine crankcase. This...

Thermostatic air filter (THERMAC) (3.1L engine)
General description 1. To ensure high driving performance of the car in various climatic conditions, it is equipped with an intake air heating system. With a...

Transmission torque converter clutch
General description 1. In the torque converter clutch (TSS) automatic transmission uses a single valve controlled by a solenoid (on engines 3.1 l) or two...

Catalyst — check and replacement
General description 1. The catalyst is an exhaust system control device installed on it in order to reduce the concentration of harmful substances in the...