System Operation

Fuel Injection System:

The Electronic Fuel Injection system in this vehicle supplies the combustion chambers with air/fuel mixture of optimized ratio under widely varying driving conditions.

It uses the multi-point fuel injection system which injects fuel into each intake port of the cylinder head.


This system has 3 major sub-systems: air intake system, fuel delivery system and electronic control system. Air delivery system includes air cleaner, air flow meter, throttle body, air valve, idle speed control (ISC) solenoid valve and intake manifold. Fuel delivery system includes fuel pump, delivery pipe, pressure regulator, etc..

Electronic control system includes ECM, various sensors and controlled devices.


This section explains not only the system related to the electronic fuel injection but also such functions of ECM as listed below.


- EGR control system.

- Idle speed control valve system.

- ESA (Electronic Spark Advance) system.

- Fuel pump control system

- Fuel injection control system

- Evaporative emission control system

NUMBERED COMPONENTS IN ILLUSTRATION
1. Oxygen sensor with heater
2. Exhaust manifold
3. PCV valve
4. Intake manifold
5. Three way catalyst
6. Charcoal canister
7. Canister purge VSV
8. ATS
9. Fuel pressure regulator
10. Fuel injector
11. TPS
12. Throttle body
13. Idle speed adjusting screw
14. Air valve
15. WTS
16. ISC solenoid valve
17. EGR valve
18. Filter
19. REGTS (California spec. model only)
20. EGR modulator
21. EGR VSV (Blue)
22. Pressure sensor
23. Throttle opener VSV (Brown)
24. Throttle opener
25. Throttle valve
26. A/C amplifier (if equipped)
27. Clutch switch (M/T) Shift switch (A/T)
28. Starter magnetic switch
29. Main relay
30. Fuel pump relay
31. Main switch
32. Battery
33. "CHECK ENGINE" light
34. Cancel switch Federal spec.
35. Mileage sensor model only
36. ECM
37. Monitor coupler
38. Ignition coil
39. Igniter
40. Blank
41. VSS
42. CAS
43. Lock-up relay (A/T only)
44. Fuel filter
45. Fuel pump
46. 2-way check valve
47. Fuel/vapor separator
48. Power steering pressure switch (if equipped)