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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-429 DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A STEP 1. Check for exhaust leak. YES : Repair it. Then go to Step 15. STEP 2. Check for intake system vacuum leak. YES : Repair it. Then go to Step 15. STEP 3. 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). • When idling, between 2.0 and 6.0 g/sec. • When 2,500 r/min, between 8.0 and 16.0 g/sec. (5) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 4. − Mass Airflow Circuit , DTC P0102 − Mass Airflow Circuit Low Input , DTC P0103 − Mass Airflow Circuit High Input . AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |