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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-308 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 Refer to Diagnostic Function − OBD-II Drive Cycle − Procedure 6 . TROUBLESHOOTING HINTS (The most • Left bank heated oxygen sensor (front) deterio- rated. • Open or shorted circuit in left bank heated oxy- gen sensor (front) output line, or harness dam- • 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 • MB991910: Main Harness A • MD998464: Test Harness • MB991923: Power Plant ECU Check 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 − How to Cope with Intermittent Malfunctions . NO : Go to Step 2. AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |