|
|
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-433 STEP 11. Using scan tool MB991502, check data list. CAUTION To prevent damage to scan tool MB991502, always turn the Reference Table( ). a. Item 45: Idle Air Control Motor Position. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the actuator operating properly? 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 b. Injector clogged. Then confirm that the malfunction symptom is eliminated. NO : Adjusting the basic idle speed. Refer to, 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 INSPECTION PROCEDURE 13: The Engine Stalls when Accelerating (Pass Out). COMMENT • In case such as the above, the cause is probably TROUBLESHOOTING HINTS (The most likely • Vacuum leak. • Malfunction of the ignition system. AC003081 AB 16 PIN MB991502 |