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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-288 OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Procedure 4 − Heated Oxygen Sensor Monitor . TROUBLESHOOTING HINTS (The most • Right bank heated oxygen sensor (rear) failed. • 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 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). (4) Warm up the engine. • After increasing the output voltage 0.15 volt or more by the engine revving, finish it. Then confirm that the output (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 − How to Cope with Intermittent Malfunctions . NO : Replace the heated oxygen sensor (rear). Then go to AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |