Component Circuit 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 to 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.