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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-737 STEP 4. Inspection of throttle body (throttle valve area) for YES : Refer to On-vehicle Service − Throttle Body (Throttle Valve Area) Cleaning . NO : Go to Step 5. STEP 5. Check the fuel pressure. . Q: Is the fuel pressure normal? YES : Go to Step 6. symptom is eliminated. STEP 6. Check the ignition timing. Check . Q: Is the ignition timing normal? YES : Go to Step 7. Then confirm that the malfunction symptom is STEP 7. Check the spark plugs. Spark Plug Check And Cleaning . Q: Are there any abnormalities? YES : Replace the spark plug. Then confirm that the malfunction symptom is eliminated. NO : Go to Step 8. STEP 8. Check the ignition coil. . Q: Are there any abnormalities? YES : Replace the ignition coil. Then confirm that the malfunction symptom is eliminated. NO : Go to Step 9. STEP 9. Check the compression pressure. . Q: Is the compression pressure normal? YES : Go to Step 10. is eliminated. |