Decreased vehicle exhaust emissions Chevrolet Lumina 1

Emission control systems
To prevent atmospheric pollution from incomplete combustion and evaporation products, to ensure vehicle performance and fuel economy, several toxicity...

Location of toxicity reduction system components
2.1a. Location of emission control system components on a 3.1L engine: 1 - air filter housing, 2-throttle position sensor (TPS), 3-distributor, 4-warm air...

Computer Command Control System (CCS) and fault codes
The computer command control system (CCS) consists of an electronic control unit (ECM on the 3.1L engine; PCM on the 3.8L engine) and information sensors that...

ROM of the electronic control unit ECM (3.1 l) and MEM-CAL of the PCM unit (3.8 l)
Removal the ECM/PCM unit 1. Electronic control unit ECM (control unit RCM) located in the car's interior under the dashboard (right side). 2. Disconnect the...

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

Air Flow Sensor (MAP) (3.1L Engine)
General description 6. MAP sensor (see illustration) carries out current monitoring of pressure changes in the manifold, which are associated with changes in...

Oxygen sensor — testing and replacement
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 The throttle position sensor (TPS) is located on the throttle shaft end of the throttle body. By continuously monitoring the output voltage...

Gear Shift Lever Neutral Position Sensor
General description 30. The Park/Neutral Position Switch, located on the transmission, provides information to the ECM/PCM when the transmission shift lever is...

Air conditioning control
Air conditioning compressor clutch control Note: To determine the relay installation locations, refer to Figures 6.2a and 6.2b section 6 Chapter 12 . 44....

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

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

Camshaft position sensor (on 3.8L engine)
Note: For additional information regarding the camshaft position sensor 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 side of the timing chain cover. It...

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 a key function in the Electronic Spark Control (ESC) system. It...

Electronic Spark Timing Control (EST)
Engine with a working volume of 3.1 liters General description 1. Electronic control unit ECM (or transmission control unit PCM) controls the ignition timing...

Electronic ignition control system (ESC) or with knock sensor (KS)
Electronic Spark Advance Control (ESC) (for engines produced in 1990-1992) or a system with a knock sensor (KS) (for engines produced since 1993.). Note: In...

Exhaust gas recirculation system (EGR 3.1 l and 3.8 l since 1993)
Note: The EGR system was not installed on 3.8L engines produced in 1990-1992. Engines with a displacement of 3.1 liters (eGR vacuum valve) General description...

Evaporative Emission 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. The...

Positive Crankcase Ventilation (PCV) System
1. The Positive Crankcase Ventilation (PCV) system serves to reduce the hydrocarbon content 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 vehicle in various climatic conditions, it is equipped with an intake air heating system. With...

Transmission torque converter clutch
General description 1. The torque converter clutch (TCC) of an automatic transmission uses a single valve controlled by a solenoid (on 3.1 l engines) or two...

Catalyst — Checking and Replacing
General description 1. A catalytic converter is a device for controlling the exhaust system, installed on it in order to reduce the concentration of harmful...

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