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1.

IG "OFF".

2.

IG "ON".

3.

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

4.

Using a GDS, Clear DTC.

5.

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

6.

Are any DTCs present ?

▶ Substitute with a known-good ECM and check for proper operation. If problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.

▶ If NG, replace HECU and then go to "Verification of Vehicle Repair" procedure.

▶ Fault is intermittent caused by faulty HECU, faulty ECM or was repaired and HECU memory was not cleared. Go to "Verification of Vehicle Repair" procedure.