Diagnosis Procedure

FUEL INJECTOR


Diagnosis Procedure

1.INSPECTION START
Turn ignition switch to START.
Are any cylinders ignited?
Yes or No
Yes - GO TO 2.
No - GO TO 3.
2.CHECK OVERALL 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.

Operating sound should exist.

OK or NG
OK INSPECTION END
NG - GO TO 3.
3.CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connectors.





3. Turn ignition switch ON.





4. Check voltage between fuel injector terminal 1 and ground with
CONSULT-III or tester.

Voltage: Battery voltage

OK or NG
OK - GO TO 5.
NG - GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M72, F102
- Fuse block (J/B) connector M4
- 15 A fuse
- Harness for open or short between fuel injector and fuse
Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 21, 22, 23, 40, 41, 42, 44, 63 and fuel injector terminal
2. Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 6.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK FUEL INJECTOR
Refer to Component Inspection.
OK or NG
OK - GO TO 7.
NG - Replace malfuncioning fuel injector.
7.CHECK INTERMITTENT INCIDENT
Refer to Diagnosis Procedure.
INSPECTION END