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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-50 STEP 1. Using scan tool MB991958, check data list item 12: CAUTION To prevent damage to scan tool MB991958, always turn the 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 YES : Go to Step 3. . Then go to Step 9. AK303804AB MB991910 DATA LINK MB991824 MB991827 AK303805 2 1 3 4 AB CONNECTOR: B-10 B-10 (GR) HARNESS CONNECTOR: AK303806 2 1 3 4 AB CONNECTOR: B-17X B-17X RELAY BOX HARNESS CONNECTOR: |