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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-216 • At least 20 seconds have passed since fuel shut off control was canceled. • Monitoring time: 8 seconds. Judgement Criteria • Making the air/fuel ratio 15 percent richer for 8 seconds does not result in raising the heated oxy- . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Procedure 6 − Other Monitor . TROUBLESHOOTING HINTS (The most • Right bank heated oxygen sensor (front) failed. • Short circuit in right bank heated oxygen sensor (front) output line. • 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 STEP 1. Using scan tool MB991958, check data list item 39: CAUTION To prevent damage to scan tool MB991958, always turn the (3) Set scan tool MB991958 to the data reading mode for item 39, Heated Oxygen Sensor Bank 1, Sensor 1 (right front). • Warm up the engine. When the engine is revved, the output voltage should measure 0.6 to 1.0 volt. • Warm up the engine. When the engine is idling, the out- put 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 |