Fuel Injector: Testing and Inspection

INSPECTION

Check operation

1. Warm up engine and let idle.




2. Listen for sound of each injector running by using sound scope or screwdriver.

WARNING: Fuel is explosive. When working on fuel system, make sure to supply adequate ventilation to the work area. Do not smoke, and keep sparks and open flames away.


CAUTION: Make sure the fuel injectors are firmly seated on the fuel rail to prevent movement and possible damage.

3. If no sound is heard, measure injector resistance.
4. If injector is OK, check wiring to injector and voltages of ECM terminals 3, 4, 31 and 32.
5. If removal of injector system is needed, refer to On-vehicle service.

Fuel leakage test

1. Remove injectors together with fuel rail.




2. Secure injectors to fuel rail with wire.

3. Connect data link connector terminals FUEL PUMP and B+ with jumper wire.
4. Turn ignition switch ON.
5. Tilt injectors about 60 degrees and verify that no fuel leaks from the injector nozzles.
6. If fuel leaks, replace injector. Refer to On-vehicle service.
7. Turn ignition switch OFF and remove jumper wire.

Volume test

1. Remove injectors together with fuel rail.
2. Secure injectors to distributor pipe with wire.
3. Reconnect injector connectors.
4. Connect jumper wire to injector to ECM wires (BRN) and ground.
5. Turn ignition ON.

6. Inspect injector volume with graduated container.

Injector volume: 130 sq.cm (130 cc, 7.95 cu-in)/min




7. If not as specified, replace injectors. Refer to On-vehicle service

NOTE:
When reassembling fuel rail and injectors:
- Use new injector O-rings
- Apply a small amount of clean engine oil to each O-ring before installing

Injector resistance

1. Disconnect injector harness.

2. Measure resistance of each injector.

Resistance: 14.5 Ohm at 68°F (20°C)




3. If not within specification, replace injector. Refer to On-vehicle service