Circuit Test

FUEL INJECTOR
The injectors inject fuel according to a signal coming from the PCM. The amount of fuel injected by the injectors is determined by the time which the solenoid valve is energized. The amount of time the solenoid value is energized is determined by the pulse width of the signal from the PGM.

Circuit Diagram:

INJECTOR CHECKING

Using Hi-scan Pro:

NOTE:
1. The injector drive time is when the supply voltage is (greater than) 11 V and the cranking speed is less than 250 rpm.
2. When the engine coolant temperature is lower than 0 °C (32 °F), the PCM fires all four cylinders simultaneously
3. When the vehicle is new (within initial operation of about 500 km [300 miles]), the injector drive time may be about 10% longer

Harness Inspection:

TROUBLESHOOTING HINTS
1. If the engine is hard to start when hot, check for fuel pressure and injector leaks.
2. If the injectors do not operate when the engine is cranked, then check the followings:
- Defective power supply circuit to the PCM, faulty ground circuit
- Defective control relay
- Defective crankshaft position (CKP) sensor or camshaft position (CMP) sensor
3. If there is any cylinder whose idle state remains unchanged when the fuel injectors are cut one after another during idling, check for the following items about that a cylinder.
- Injector and harness
- Ignition plug and high tension cable
- Compression pressure
4. If the injection system is OK but the injector drive time is out of specification, check for the following items.
- Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
- Loose EGR valve seating.