Fuel Injector

FUEL INJECTOR

Component Function Check


1. INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?
YES- GO TO 2.
NO- Proceed to .

2. CHECK FUEL INJECTOR FUNCTION

With CONSULT
1.Start engine.
2.Perform "POWER BALANCE" in "ACTIVE TEST" mode of "ENGINE" using CONSULT.
3.Check that each circuit produces a momentary engine speed drop.
Without CONSULT
1.Let engine idle.





2.Listen to each fuel injector operating sound.
Clicking noise should be heard.
Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to .


Diagnosis Procedure


1. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect fuel injector harness connector.
3.Turn ignition switch ON.
4.Check the voltage between fuel injector harness connector and ground.





Is the inspection result normal?
YES- GO TO 9.
NO- GO TO 2.

2. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between fuel injector harness connector and ECM harness connector.





4.Also check harness for short to ground.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace error-detected parts.

3. CHECK FUEL INJECTOR DRIVER POWER SUPPLY

1.Reconnect ECM harness connector.
2.Turn ignition switch ON.
3.Check the voltage between ECM harness connector and ground.





Is the inspection result normal?
YES- Check intermittent incident. Intermittent Incident
NO- GO TO 4.

4. CHECK FUEL INJECTOR DRIVER POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Disconnect fuel injector relay harness connector.
4.Check the continuity between ECM harness connector and fuel injector relay harness connector.





5.Also check harness for short to ground.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts

5. CHECK FUEL INJECTOR RELAY POWER SUPPLY (CONTACT SIDE)

Check the voltage between fuel injector relay harness connector and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- Perform the trouble diagnosis for power supply circuit.

6. CHECK FUEL INJECTOR RELAY POWER SUPPLY (EXCITATION COIL SIDE)

1.Reconnect all harness connectors disconnected.
2.Turn ignition switch ON.
3.Check the voltage between fuel injector relay harness connector and ground.





Is the inspection result normal?
YES- GO TO 8.
NO- GO TO 7

7. CHECK FUEL INJECTOR RELAY POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE)

1.Turn ignition switch OFF.
2.Disconnect fuel injector relay harness connector.
3.Disconnect IPDM E/R harness connector.
4.Check the continuity between IPDM E/R harness connector and fuel injector harness connector.





5.Also check harness for short to ground.
Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.

8. CHECK FUEL INJECTOR RELAY GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect fuel injector relay harness connector.
3.Check the continuity between fuel injector relay harness connector and ground.





4.Also check harness for short to power.
Is the inspection result normal?
YES- GO TO 10.
NO- Repair or replace error-detected parts.

9. CHECK FUEL INJECTOR GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between fuel injector harness connector and ECM harness connector.





4.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- GO TO 11.
NO- Repair or replace error-detected parts.

10. CHECK FUEL INJECTOR RELAY

Check the fuel injector relay. .
Is the inspection result normal?
YES- Check intermittent incident. Intermittent Incident
NO- Replace fuel injector relay. Standardized Relay.

11. CHECK FUEL INJECTOR

Check the fuel injector. .
Is the inspection result normal?
YES- Check intermittent incident. Intermittent Incident
NO- Replace malfunctioning fuel injector. Exploded View.


Component Inspection (Fuel Injector)


1. CHECK FUEL INJECTOR

1.Turn ignition switch OFF.
2.Disconnect fuel injector harness connector.
3.Check resistance between fuel injector terminals as per the following.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace malfunctioning fuel injector.Exploded View


Component Inspection (Fuel Injector Relay)


1. CHECK FUEL INJECTOR RELAY

1.Turn ignition switch OFF.
2.Remove fuel injector relay.





3.Check the continuity between fuel heater relay terminals as per the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace fuel injector relay.