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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-891 STEP 5. 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 : Go to Step 7. STEP 6. Check the fuel pressure. − Fuel Pressure Test Q: Is the fuel pressure normal? YES : Check the following items, and repair or replace the defective items. •Broken intake manifold gasket. •Broken air intake hose. •Broken vacuum hose. •Positive crankcase ventilation valve does not operate. b.Injector clogged. Then confirm that the malfunction symptom is eliminated. NO : Repair or replace it. Then confirm that the malfunction symptom is eliminated. STEP 7. Check the fuel pressure. − Fuel Pressure Test Q: Is the fuel pressure normal? YES : Check the following items, and repair or replace the defective items. cables. b.Check the EGR system. Then confirm that the malfunction symptom is eliminated. NO : Repair or replace it. Then confirm that the malfunction symptom is eliminated. AK302970 AB MB991911 MB991824 MB991827 |