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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L> 13A-45 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 96 °C (176°F to 205°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 power supply voltage at volume (3) Measure the voltage between terminal No. 4 and ground by backprobing. • Voltage should be battery positive voltage. (4) Turn the ignition switch to the "LOCK" (OFF) position. present? AK300810 AB MB991911 16-PIN MB991827 MB991824 AK300078 3 4 5 1 2 6 7 CONNECTOR: B-14 AB B-14 (B) HARNESS AKX01514 AH 1 2 3 4 5 6 7 B-14 HARNESS |