Fuel 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-port fuel injection system which injects fuel into the 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 intake system includes air cleaner, throttle body, MAP sensor, IAC valve and intake manifold. Fuel delivery system includes fuel pump, delivery pipe fuel pressure regulator, etc.. Electronic control system includes ECM, various sensors and controlled devices. This database explains the system related to the electronic fuel injection as well as such functions of ECM as listed below.
- EGR system
- Evaporative emission control system
- Oxygen sensor heater control system
- Throttle valve opening signal and engine coolant temp. signal output for A/T
- Ignition control system
- Radiator fan control system
- A/C ON/OFF control system





1. Air cleaner
2. EVAP canister purge valve
3. Intake air temperature sensor
4. Throttle position sensor
5. Idle speed adjusting screw
6. Idle air control valve
7. Manifold absolute pressure sensor
8. EGR solenoid vacuum valve
9. EGR valve
10. EGR pressure transducer
11. Transmission control module (A/T)
12. A/C amplifier (if equipped)
13. EVAP canister
14. Tank pressure control valve
15. Fuel pressure regulator
16. Fuel filter
17. PCV valve
18. Fuel injector
19. Heated oxygen sensor
20. Fuel pump
21. Warm-up three way catalytic convertor
22. Engine coolant temperature sensor
23. Three way catalytic convertor
24. Camshaft position sensor
25. Ignitor
26. Electric load (blower fan, small light, rear defogger)
27. Ignition coil
28. Diagnosis switch terminal
29. Test switch terminal
30. Diagnosis connector 1
31. Malfunction indicator lamp ("CHECK ENGINE" light)
32. Speedometer
33. Vehicle speed sensor
34. Radiator fan
35. Clutch pedal position switch (M/T) or transmission range switch (A/T)
36. Ignition switch
37. Starter magnetic switch
38. Main fuse
39. Battery
40. Engine control module





The fuel delivery system consists of the fuel tank, fuel pump, fuel filter, fuel pressure regulator, delivery pipe and fuel injectors. The fuel in the fuel tank is pumped up by the fuel pump, filtered by the fuel filter and fed under pressure to each injector through the delivery pipe. As the fuel pressure applied to the injector (the fuel pressure in the fuel feed line) is always kept a certain amount higher than the pressure in the intake manifold by the fuel pressure regulator, the fuel is injected into the intake port of the cylinder head when the injector opens according to the injection signal from ECM. The fuel relieved by the fuel pressure regulator returns through the fuel return line to the fuel tank. For the structure and operation of the fuel tank and filter, "ENGINE FUEL".