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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-1029 INSPECTION PROCEDURE 22: Too high CO and HC concentration when idling . COMMENT • Abnormal air/fuel ratio is suspected. . TROUBLESHOOTING HINTS (The most likely • Malfunction of air/fuel ratio control system. • Deteriorated catalyst. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A STEP 1. Using scan tool MB991958, read the diagnostic CAUTION To prevent damage to scan tool MB991958, always turn the (3) Read the DTC. YES : Refer to Diagnostic Trouble Code Chart NO : Go to Step 2. STEP 2. Check the ignition timing. Refer to GROUP 11A, On-vehicle Service − Ignition Timing Check Q: Is the ignition timing normal? YES : Go to Step 3. belt cover are in the correct position. Then confirm AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |