6537353

1.

Ignition "OFF".

2.

Ignition "ON"

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 ?

YES

a.

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

a.

Fault is intermittent caused by faulty HECU or was repaired and HECU memory was not cleared.

Go to "Verification of Vehicle Repair" procedure.