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Q:Is the compression pressure normal? YES: Check the following items, and repair or replace the defective items. a Check if fuel is contaminated. b Check if the injectors are clogged. Then confirm that the malfunction symptom is eliminated. NO: Repair it. Then confirm that the malfunction symptom is eliminated. INSPECTION PROCEDURE 7: Unstable Idle (rough idle, hunting). M11310100284USA0000010000 COMMENT ⦆ In cases such as the above, the cause is probably TROUBLESHOOTING HINTS (The most likely ⦆ Malfunction of the fuel pump system. ⦆ Malfunction of the ignition system. ⦆ Malfunction of the injector system. ⦆ Poor compression ⦆ Malfunction of the purge control system ⦆ Malfunction of the EGR system ⦆ Improper operation of the PCV valve. ⦆ Malfunction of the charging system. ⦆ Vacuum leak. ⦆ Contaminated fuel. ⦆ Malfunction of the ECM.
DIAGNOSIS Required Special Tools: ⦆ MB991958: Scan Tool (M.U.T.-III Sub Assembly) ⦆ MB991824: V.C.I. ⦆ MB991827: USB Cable ⦆ MB991910: Main Harness A ⦆ MB992110: Power Plant ECU Check Harness STEP 1. Check if the EGR valve sounds during initialization. Q:Is the initialization sound heard in the EGR valve? YES: Go to Step 2. NO: Refer to GROUP 17, Emission Control - EGR Valve (Stepper Motor) Check P.17c-14. MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS> 13Ab-775 SYMPTOM PROCEDURES |