Electronic fuel injection system diagram for 1990–1994 models
1. Air filter housing; 2. Resonator pipe; 3. Air flow sensor (with temperature sensor); 4. Vacuum chamber *1; 5. Fuel shut-off valve; 6. Carbon filter purge valve; 7. *; 8. Solenoid valve *2 (pressure regulator control valve); 9. *; 10. Carbon filter; 11. Pressure regulator; 12. Fuel filter; 13. Check valve; 14. Check and shut-off valve; 15. Separator; 16. Fuel tank; 17. Fuel pump; 18. Fuel filter; 19. *; 20. Oxygen sensor; 21. Crankcase ventilation valve; 22. *; 23. Injector; 24. *; 25. Engine coolant temperature sensor; 26. Closing valve; 27. Air valve; 28. Air supply control valve; 29. *; 30. Throttle position sensor; 31. *; 32. Shock absorber; 33. Resonator chamber; 34. *; 35. *
* To the electronic engine control unit
Electronic fuel injection system diagram for models produced after 1995
1. Fuel vapor collection container; 2. Blow-off valve (upper); 3. Blow-off valve (lower); 4. Blow-off valve (upper); 5. Camshaft position sensor; 6. Solenoid valve; 7. Throttle position sensor; 8. Throttle closing sensor; 9. Air flow sensor; 10. Incoming air temperature sensor; 11. Air filter; 12. Recirculation valve opening sensor; 13. Recirculation sensor; 14. Solenoid valve; 15. Recirculation valve (ventilation); 16. Recirculation valve (vacuum); 17. Air supply control valve; 18. Solenoid valve; 19. Air valve; 20. Shut-off valve; 21. Vacuum chamber; 22. Injector; 23. Crankshaft position sensor; 24. Coolant temperature sensor; 25. Oxygen sensor (front); 26. Catalytic converter; 27. Oxygen sensor (rear); 28. Fuel pump; 29. Fuel filter; 30. Fuel leak prevention valve; 31. Drain hose; 32. Check valve; 33. Pressure regulator; 34. Carbon filter; 35. Check valve; 36. Fuel pump; 37. Ventilation valve; 38. Fuel tank pressure regulating valve; 39. Fuel filter; 40. Check valve
The electronic fuel injection system consists of three subsystems: the fuel supply system, the air supply system and the electronic control system.
Power supply system
The fuel pump pumps fuel into the fuel rail, from where it enters the cylinders through the injectors. The amount of fuel injected by the injectors is controlled by an electronic control unit.
Air supply system
The system consists of an air filter, throttle body, connecting pipe and inlet air temperature sensor.
Electronic control system
The electronic control system controls the fuel injection system and other systems using an electronic control unit, which receives signals from various sensors that monitor incoming air temperature, throttle angle, coolant temperature, crankshaft speed, vehicle speed, and CO content in the exhaust gases.
Examination
1. Check the reliability of the wire connections and the grounding reliability.
2. Check the battery charge.
3. Check the air filter.
4. Check the fuses.
5. Check the air intake hose and intake manifold for leaks. Check that the air intake pipe and throttle body are not clogged. Clean it if necessary.
6. Check the injectors by listening to their operation with a stethoscope.
7. Check the injectors using a test light.
8. Check the resistance of the injectors.
9. For a more detailed check of the system, you need to contact specialists.