Component Inspection
- Ignition "OFF"
- Ignition "ON" & Engine "OFF".
- Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
- Using a scantool, Clear DTC.
- Select "Diagnostic Trouble Codes (DTCs)" mode again.
- Are any DTCs present?
YES
- Substitute with a known-good PCM (ECM) and check for proper operation. If problem is corrected, replace PCM (ECM) and then go to VERIFICATION OF VEHICLE REPAIR procedure.
If NG, replace HECU and then go to VERIFICATION OF VEHICLE REPAIR procedure.
NO
- Fault is intermittent caused by faulty HECU, faulty PCM (ECM) or was repaired and HECU memory was not cleared.
Go to VERIFICATION OF VEHICLE REPAIR procedure.
- Substitute with a known-good PCM (ECM) and check for proper operation. If problem is corrected, replace PCM (ECM) and then go to VERIFICATION OF VEHICLE REPAIR procedure.