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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-117 DIAGNOSIS Required Special Tool: • MB991316: Test Harness STEP 1. Check the left bank heated oxygen sensor (rear). B-13 and connect test harness special tool, MB991316, to (2) Measure the resistance between heated oxygen sensor connector terminal No. 1 (red clip) and terminal No. 3 (blue Standard value: 11 − 18 Ω [at 20°C (68°F)] Q: Is the measured resistance between 11 and 18 ohms [at 20 °C (68°F)]? YES : Go to Step 2. Then go to Step 3. STEP 2. Check the trouble symptoms. Diagnostic Function − OBD-II Drive Cycle − Pattern 2 (2) Check the diagnostic trouble code (DTC). YES : Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis with KOS> P.42B-15 or GROUP 42C, Diagnosis − ID Codes Registration Judgment Table <Vehicles with P.42C-10 . Then go to Step 3. NO : It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use − How to Cope with Intermittent Malfunctions P.00-15 . STEP 3. Test the OBD-II drive cycle. Diagnostic Function − OBD-II Drive Cycle − Pattern 2 (2) Check the diagnostic trouble code (DTC). YES : Retry the troubleshooting. AK700175 Heated MB991316 Red Blue AB |