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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-251 TROUBLESHOOTING HINTS (The most likely • Right bank heated oxygen sensor (front) deterio- rated. • ECM failed. <M/T> • PCM failed. <A/T> DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991911: Main Harness B • MB998464:Test Harness STEP 1. Using scan tool MB991958, check data list item 39: CAUTION To prevent damage to scan tool MB991958, always turn the 39, Heated Oxygen Sensor Bank 1, Sensor 1 (right front). (4) Warm up the engine, 2,500 r/min. • Output voltage repeats 0.4 volt or less and 0.6 − 1.0 volt 10 times or more within 10 seconds. (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 Troubleshooting/ NO : Replace the right bank heated oxygen sensor (front). Then go to Step 2. AK300810 AB MB991911 16-PIN MB991827 MB991824 |