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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-363 INSPECTION PROCEDURE 8: Unstable Idle (Rough Idle, Hunting). COMMENT • In cases such as the above, the cause is TROUBLESHOOTING HINTS (The most likely • Malfunction of the ignition system. • Malfunction of air/fuel ratio control system. • Malfunction of the IAC system. • Malfunction of the evaporative emission purge • Poor compression pressure. • Vacuum leak. • Malfunction of the EGR solenoid system. DIAGNOSIS Required Special Tool: 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 NO : Go to Step 2. STEP 2. Using scan tool MB991502, read the diagnostic CAUTION To prevent damage to scan tool MB991502, always turn the Q: Is the DTC is output? YES : Refer to, Diagnostic Trouble Code Chart ( NO : Go to Step 3. STEP 3. Check the engine idling state. Q: Is it hunting remarkably? YES : Go to Step 4. AKX01177 16 PIN MB991502 AB |