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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-1064 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. a. Vacuum leak. • 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. a. Check the ignition coil and spark plugs. Then confirm that the malfunction symptom is eliminated. NO : Repair or replace it. Then confirm that the malfunction symptom is eliminated. INSPECTION PROCEDURE 16: Acceleration shock. . COMMENT • There may be an ignition leak accompanying the increase in the spark plug demand voltage during . TROUBLESHOOTING HINTS (The most • Malfunction of the ignition system. • Malfunction of the electronic control throttle valve system. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A |