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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-895 STEP 4. Using scan tool MB991958, check data list. Reference Table a. Item 39: Right Bank Heated Oxygen Sensor (front). • Voltage should fluctuate between 0 − 0.4 volts and 0.6 − 1.0 volts while idling after the engine has been warmed. (3) Turn the ignition switch to the "LOCK" (OFF) position. YES : Replace the heated oxygen sensor (front). Then confirm that the malfunction symptom is eliminated. If NO : Go to Step 5. STEP 5. Check the fuel pressure. − Fuel Pressure Test Q: Is the fuel pressure normal? YES : Go to Step 6. symptom is eliminated. STEP 6. Check the following items. defective items. a. Check the injectors for fuel leakage. c. Check compression pressure. d. Check the positive crank case ventilation system. f. Check the EGR system. (2) Then check the malfunction symptom. YES : The check is completed. malfunction symptom is eliminated. AK302970 AB MB991911 MB991824 MB991827 |