Code 4152

CIRCUIT DIAGRAM

















TROUBLESHOOTING PROCEDURES





USING SCAN TOOL





USING VOLTMETER





HARNESS INSPECTION PROCEDURES










INJECTOR INSPECTION

Operation Check
Using a scan tool, check as described below.
- Activate the fuel injectors in sequence.
- Check the operation time of the injectors.

Operation Sound Check





1. Using a stethoscope, check the injectors for a clicking sound at idle. Check that the sound is produced at shorter intervals as the engine speed increases.

NOTE: Ensure that the sound from an adjacent injector is not being transmitted along the delivery pipe to an inoperative injector.





2. If a stethoscope is not available, check the injector operation with your finger.
If no vibrations are felt, check the wiring connector, injector, or injection signal from Engine Control Module (ECM).

RESISTANCE MEASUREMENT
1. Disconnect the connector at the injector.





2. Measure the resistance between terminals.

Standard value: 13 - 16 Ohms (at 20°C (68°F)

3. Connect the connector to the injector.

TROUBLE SHOOTING HINTS
1. If the engine is hard to start when hot, check for fuel pressure and injector leaks.
2. If the injector does not operate when the engine is cranked, then check the followings:
- Faulty power supply circuit to the Engine Control Module (ECM), faulty ground circuit
- Faulty Multiport Fuel Injection (MFI) control relay
- Faulty crankshaft position sensor, camshaft position sensor
3. If there is any cylinder whose idle state remains unchanged when the fuel injection of injectors is cut one after another during idling, check for the following items about such 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 poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)