Emission Control System Specifications Crank angle sensor resistance: until 1987 (sensors "TDC" And "cylinder") - 0.65-0.85 kOhm since 1988 - 350 - 550 Ohm Throttle position sensor resistance - 3.2-7.2 kOhm Air flow control valve resistance - 8-15 ohms Air...
General information about the emission control system In order to prevent emissions of harmful substances into the atmosphere and good economy, emission control systems for harmful components are being introduced. They consist of: self-diagnostic systems; electronic engine...
Self-diagnosis system — description and fault codes Note: The self-diagnosis system is installed only on vehicles with PGM - FI fuel injection as an extension of the control system. If the dashboard has indicators PGM - FI (models from 1985 to 1987) or CHECK ENGINE...
Oxygen sensor — control and replacement Control Models up to 1988 1. The oxygen sensor is installed in the exhaust manifold. Disconnect the sensor connector. 2. Start the engine and set the mode to 3000 rpm. Wait 2 minutes. 3. Raise the RPM to 4000 and...
Absolute pressure sensor — control and replacement Control Models up to 1986 1. Check the condition of the vacuum hose between the throttle body and the sensor. Replace if necessary. 2. Check the correct connection of the electrical connector of the sensor, the...
Crankshaft angle sensor — control and replacement Models up to 1988 1. On these models, the angle encoder consists of two individual encoders: "TDC" And "cylinder". Sensor "cylinder" defines the position of the first cylinder as the base for counting the injection...
Throttle position sensor — control and replacement Control Models up to 1988 1. The throttle position sensor is located on the throttle body. Disconnect the sensor electrical connector. 2. Measure the resistance between the black-brown and yellow-red contacts. Compare...
Air flow control valve (models since 1988) — control and replacement Control 1. Turn off the ignition. 2. Remove the fuse "HAZARD" from the fuse panel for 10 seconds to reset the EMU memory. 3. Start the engine and check that the indicator "CHECK ENGINE" blinking. Stop the engine. 4....
Air temperature sensor (models with injection) — control and replacement Control 1. On a cold engine, disconnect the sensor electrical connector. which is located on the intake manifold. Measure the resistance between the two terminals of the sensor and compare it with the specification...
Crankcase ventilation system 1. The crankcase ventilation system includes a positive pressure valve that reduces the emission of hydrocarbon gases rushing into the crankcase. Pic. 9.1. Typical crankcase ventilation pattern 2. The main element of...
Evaporative Emission System General description 1. The fuel vapor recovery system collects fuel vapors and, during engine operation, mixes them with the finished fuel-air mixture. 2. The vapor accumulator is a container filled with activated...
Intake air temperature control system (models with carburetor) General description 1. The intake air temperature control system provides warm air during engine warm-up and maintains the intake temperature at about 40 degrees Celsius. This improves the conditions for creating an...
Ignition advance control system General description 1. The ignition advance control system is designed to optimize the combustion process. Pic. 12.1a Ignition advance control system (models with carburetor) Pic. 12.1a Ignition advance control system...
Throttle control system General description 1. Throttle control system can reduce exhaust emissions, make it easier to start, improve smoothness during shifting and deceleration. Pic. 13.1 Throttle control circuit 2. When the engine is idling,...
Atmospheric pressure compensator General description 1. The compensator is a device that controls the amount of air supplied to the small and large diffusers of the primary chamber of the carburetor and the large diffuser of the secondary chamber. Pic....
Catalytic converter General description 1. Converter - a device installed in the exhaust system to reduce emissions of harmful substances. Neutralizers can be of two types: A) to reduce carbon monoxide emissions (CO), hydrocarbons (CH); b)...
Exhaust gas recirculation (EG) system 1. EGR system reduces nitric oxide (NO), passing part of the exhaust gases to the engine inlet. 2. On engine models with carburetors, the EGR system consists of a bypass valve, two control valves and a thermal valve....
Air mixing system General description 1. The system is designed to improve the working conditions of the exhaust gas control system. Pic. 17.1 Typical secondary air mixing scheme Control 2. Entrust the control to the service station...
Air-fuel mixture control system when shifting gears 1. The system prevents excessive enrichment of the mixture during gear changes or vehicle deceleration. Pic. 18.1 Typical diagram of a mixture control system when shifting gears 2. Entrust the control of the correct...
Feedback system 1. The feedback system ensures optimal preparation of the fuel-air mixture under different engine operating conditions. Pic. 19.1 Diagram of the feedback system 2. Entrust the control of the correct functioning of the...