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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-37 STEP 1. Using scan tool MB991958, check data list item 12: CAUTION To prevent damage to scan tool MB991958, always turn the 12, Volume 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 10 Hz or more. • When the engine is revved, the frequency 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 NO : Go to Step 2. STEP 2. Measure the reset signal voltage at volume airflow (3) Measure the voltage between terminal No. 7 and ground by backprobing. • Voltage should be between 6.0 and 9.0 volts. (4) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 5. AK303629AB MB991911 MB991827 MB991824 16-PIN AK103913 3 4 5 1 2 6 7 CONNECTOR: A-01 A-01(B) AB HARNESS AKX01515 AI A-01 HARNESS 1 2 3 4 5 6 7 |