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1.

Ignition "OFF".

2.

Ignition "ON" & Engine "OFF".

3.

Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode.

4.

Using a scantool, Clear DTC.

5.

Select "Diagnostic Trouble Codes(DTCs)" mode again.

6.

Are any DTCs present ?

▶ 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.

▶ Fault is intermittent caused by faulty HECU.

Go to "Verification of Vehicle Repair" procedure.