Fuel Injector: Testing and Inspection

FUEL INJECTOR





Component Function Check
1.INSPECTION START
Turn ignition switch to START.
Are any cylinders ignited?
YES - GO TO 2.
NO - Proceed to SEE Diagnosis Procedure.
2.CHECK FUEL INJECTOR FUNCTION
WITH CONSULT-III
1. Start engine.
2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-III.
3. Check that each circuit produces a momentary engine speed drop.
WITHOUT CONSULT-III
1. Start engine.





2. Listen to each fuel injector operating sound.

Clicking sound should be heard.

Is the inspection result normal?
YES - INSPECTION END
NO - Proceed to SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK FUEL INJECTOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector and ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Perform the trouble diagnosis for power supply circuit. Power Supply And Ground Circuit.
2.CHECK FUEL INJECTOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector and 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 3.
NO - Repair or replace error-detected parts.
3.CHECK ECM GROUND CIRCUIT
Check the continuity between ECM harness connector and ground.





Is inspection result normal?
YES - GO TO 4.
NO - Repair or replace error-detected parts.
4.CHECK FUEL INJECTOR
SEE Component Inspection.
Is the inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - Replace malfunctioning fuel injector.




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





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