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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-271 Judgment Criteria • Input voltage supplied to the PCM interface circuit is higher than 4.5 volts when 5 volts is applied to . OBD-II DRIVE CYCLE PATTERN − OBD-II Drive Cycle − Procedure 6 − Other Monitor . . TROUBLESHOOTING HINTS (The most likely • Left bank heated oxygen sensor (front) deterio- rated. • Short circuit in left bank heated oxygen sensor (front) output line or harness damage. • Open circuit in left bank heated oxygen sensor (front) ground line or harness damage. • Connector damage. • PCM failed. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991911: Main Harness B • MB991316: Test Harness STEP 1. Using scan tool MB991958, check data list item 11: CAUTION To prevent damage to scan tool MB991958, always turn the (3) Set scan tool MB991958 to the data reading mode for item 11, Heated Oxygen Sensor Bank 2, Sensor 1 (left front). • Warming up the engine. When the engine is revved, the output voltage should be 0.6 to 1.0 volt. • Warming up the engine. When the engine is idling, the output voltage should repeat 0.4 volt and 0.6 to 1.0 volt (4) 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. AK302970 AB MB991911 MB991824 MB991827 |