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 HECU and check for proper operation.
If problem is corrected, replace HECU and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO:
- Fault is intermittent caused by faulty HECU.
Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Substitute with a known-good HECU and check for proper operation.