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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-1018 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. f. Clogged air cleaner. g. Clogged exhaust system. Then confirm that the malfunction symptom is eliminated. NO : Repair or replace it. Then confirm that the malfunction symptom is eliminated. INSPECTION PROCEDURE 19: Surge. . COMMENT • Defective ignition system, abnormal air/fuel ratio, the electronic control throttle valve system failed, . TROUBLESHOOTING HINTS (The most • Malfunction of the ignition system. • Malfunction of air/fuel ratio control system. • Malfunction of the electronic control throttle valve system. • Malfunction of the EGR system. |