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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-483 DIAGNOSIS STEP 1. Check connector C-58 at ECM <M/T> or connector Q: Is the connector in good condition? YES : Go to Step 2. Connector Inspection ( ). Then confirm that the malfunction symptom is eliminated. STEP 2. Check the output voltage at ECM harness side measure at the harness side. (2) Start the engine and run at idle. T> and ground. • If atmospheric air temperature is 15 ° C (59 ° F) or less, the voltage should be 1 volt or less. • If atmospheric air temperature is 18 ° C (65.4 ° F) or more, the voltage should be battery positive voltage. (5) Turn the A/C switch "OFF". Q: Is the voltage normal? YES : Replace the ECM or PCM. Then confirm that the malfunction symptom is eliminated. NO : Refer to GROUP 55, Introduction To Heater, Air Conditioning And Ventilation Diagnosis ( AK000366AC 47 46 45 41 42 43 44 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 <M/T> C-58 HARNESS AK000367AC <A/T> C-55 HARNESS 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 |