Systems Descriptions and Components

The engine and emission control system has 4 major sub-systems: air intake system, fuel delivery system, electronic control system and emission control system.

Air intake system includes air cleaner, mass air flow sensor, throttle body, idle air control valve and intake manifold.

Fuel delivery system includes fuel pump, delivery pipe, fuel pressure regulator, fuel injectors, etc.

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

Emission control system includes EGR, EVAP and PCV systems.




1. Air cleaner
2. Intake air temp. sensor
3. Mass air flow sensor
4. EVAP canister purge valve
5. Throttle position sensor
6. Idle air control valve
7. Camshaft position sensor
8. EGR valve (if equipped)
9. Manifold differential pressure sensor
10. Fuel injector
11. PCV valve
12. Ignition coil assembly
13. Engine coolant sensor
14. Heated oxygen sensor (bank 1 sensor 1)
15. Heated oxygen sensor (bank 2 sensor 1)
16. Heated oxygen sensor (bank 1 sensor 2)
17. Heated oxygen sensor (bank 2 sensor 2)
18. Warm-up three way catalytic converter
19. Three way catalytic converter
20. Crank position sensor
21. Fuel pump
22. Fuel level sensor
24. Fuel filter
25. Fuel pressure regulator
26. Tank pressure control vacuum solenoid valve
27. Tank pressure control valve
28. EVAP canister
29. EVAP canister air valve
30. ECM/PCM (Engine control module/Powertrain control module)
31. Malfunction indicator lamp ("SERVICE ENGINE SOON" light)
32. Electric loads
- Rear defogger (if equipped)
- Lighting (M/T)
33. Power steering pressure switch (if equipped)
34. Heater blower fan switch
35. Cruise control module
36. Vehicle speed sensor
37. Combination meter
38. A/C condenser fan relay (if equipped)
39. A/C controller (if equipped)
40. Data link connector/Immobilizer control module (if equipped)
41. ABS control module (if equipped)
42. Main relay
43. Ignition switch
44. Park/Neutral position switch in TR switch (A/T)
45. Battery
46. Starter magnetic switch
47. "O/D OFF" lamp (A/T)
48. "POWER" lamp (A/T)
49. Lighting switch (A/T)
50. Stop lamp switch (A/T)
51. O/D cut switch (A/T)
52. POWER/NORMAL change switch (A/T)
53. 4WD low switch (A/T)
54. Transmission range switch (A/T)
55. Solenoid valve A (A/T)
56. Solenoid valve B (A/T)
57. TCC solenoid valve (A/T)
58. A/T input speed sensor (A/T)
59. A/T vehicle (output) speed sensor (A/T)