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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-157 DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (M.U.T.-III Sub Assembly) • MB991824: V.C.I. • MB992110: Power Plant ECU Check Harness STEP 1. Using scan tool MB991958, check data list item 8: CAUTION To prevent damage to scan tool MB991958, always turn the 8, Manifold Absolute Pressure Sensor. • When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg). in.Hg). • When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg). (4) Start the engine. • When the engine is idling, 31 − 45 kPa (9.1 − 13.3 in.Hg). pressure varies. (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 Cope with Intermittent Malfunctions . NO : Go to Step 2. STEP 2. Measure the sensor supply voltage at manifold backprobing. • Voltage should be between 4.9 and 5.1 volts. (4) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 8. AC608435 Data link connector MB991827 MB991824 MB991910 AB 3 2 1 AK203036 B-18 harness AM |