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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-253 OBD-II DRIVE CYCLE PATTERN − OBD-II Drive Cycle − Procedure 6 − Other Monitor . . TROUBLESHOOTING HINTS (The most likely • Right bank heated oxygen sensor (rear) failed. • Open or shorted circuit in right bank heated oxy- gen sensor (rear) output line or harness damage. • Open circuit in right bank heated oxygen sensor (rear) 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 • MB991316: Test Harness • MB991923: Power Plant ECU Check Harness STEP 1. Using scan tool MB991958, check data list item 69: CAUTION To prevent damage to scan tool MB991958, always turn the (3) Set scan tool MB991958 to the data reading mode for item 69, Heated Oxygen Sensor Bank 1, Sensor 2 (right rear). • Warming up the engine. When the engine is revved, the output voltage should repeat 0 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. AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |