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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-60 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 12: CAUTION To prevent damage to scan tool MB991958, always turn the (3) Set scan tool MB991958 to the data reading mode for item 12, Mass Airflow Sensor. (4) Warm up the engine to normal operating temperature: 80 °C to 95 °C (176°F to 203°F). • The standard value during idling should be between 2.0 and 6.0 g/sec. • When the engine is revved, the mass airflow rate should increase according to the increase in engine speed. (5) 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 mass airflow 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 |