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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-121 STEP 1. Check harness connector A-33X at the MFI relay, YES : Go to Step 2. Connector Inspection P.00E-2 . Then go to Step 6. STEP 2. Check the left bank heated oxygen sensor (front). connector B-14 and connect test harness special tool, (2) Measure the resistance between left bank heated oxygen sensor (front) connector terminal No. 1 (red clip) and Standard value: 4.5 − 8.0 Ω [at 20°C (68°F)] Q: Is the measured resistance between 4.5 and 8.0 ohms [at 20 °C (68°F)]? YES : Go to Step 3. Then go to Step 6. STEP 3. Check for harness damage between MFI relay P.00E-2 . Then go to Step 6 . heated oxygen sensor (front) connector B-14. (2) Measure the resistance between the MFI relay connector A-33X (terminal No. 2) and the left bank heated oxygen • Should be less than 2 ohms. Q: Is the harness wire in good condition? YES : Go to Step 4. AK700179 MD998464 Red Blue AB Heated AKA00834 3 1 2 4 1 2 3 4 B-14 harness A-33X harness AB |