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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-128 DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A • MB991923: Power Plant ECU Check Harness STEP 1. Using scan tool MB991958, check data list item 13: CAUTION To prevent damage to scan tool MB991958, always turn the (3) Set scan tool MB991958 to the data reading mode for item 13, Intake Air Temperature Sensor. • The intake air temperature and temperature shown with the scan tool should approximately match. (4) Turn the ignition switch to the "LOCK" (OFF) position. YES : It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use − How to Cope with Intermittent Malfunctions . NO : Go to Step 2. STEP 2. Check harness connector B-10 at the intake air Q: Is the harness connector in good condition? YES : Go to Step 3. . Then go to Step 11. AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 AK303015 2 1 3 4 AB B-10 (GR) CONNECTOR: B-10 HARNESS |