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2002 Mitsubishi Eclipse GT Symptom Related Diagnostic Procedures

2002 Mitsubishi Eclipse GT V6-3.0L SOHC

Unstable Idle (Rough Idle, Hunting).


- In cases such as the above, the cause is probably the air/fuel mixture or idle air control motor. Other systems affecting idle quality include the ignition system and compression.

TROUBLESHOOTING HINTS (The most likely causes for this case:)

- Malfunction of the ignition system. - Malfunction of air/fuel ratio control system. - Malfunction of the IAC system. - Malfunction of the evaporative emission purge solenoid system. - Poor compression pressure. - Vacuum leak. - Malfunction of the EGR solenoid system.


Required Special Tool: - MB991502: Scan Tool (MUT-II)

STEP 1. Check if the battery terminal is disconnected.

Q: Has the battery terminal been disconnected lately?

YES: Start the engine and let it run at idle for approximate 10 minutes after engine warm up. Then, if a malfunction occurs, go to Step 2. 

NO: Go to Step 2.

STEP 2. Using scan tool MB991502, read the diagnostic trouble code (DTC). Download File PDF

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