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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-765 STEP 10. Check the fuel pressure. − Fuel Pressure Test Q: Is the fuel pressure normal? YES : Go to Step 11. symptom is eliminated. STEP 11. Using scan tool MB991958, check data list. CAUTION To prevent damage to scan tool MB991958, always turn the Reference Table a. Item 45: Idle Air Control Motor Position. (4) Turn the ignition switch to the "LOCK" (OFF) position. 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 : Adjusting the basic idle speed. Refer to On-vehicle Service − Basic Idle Speed Adjustment STEP 12. Check the ignition timing. − Ignition Timing Check Q: Is the ignition timing normal? YES : Check the following items, and repair or replace the defective items. a. Check the ignition coil, spark plugs, spark plug cables. b. Check if the injectors are clogged. c. Check compression pressure. d. Check if the foreign materials (water, kerosene, etc.) got into fuel. Then confirm that the malfunction symptom is eliminated. NO : Check that the crankshaft position sensor and timing cover are in the correct position. Then confirm that the AK303629AB MB991911 MB991827 MB991824 16-PIN |