Component Inspection

Inspection Condition	Inspection Procedure	Reference
Ignition "ON".	Ignition "OFF". Ignition "ON". Connect KDS to "Data Link Connector (DLC)". Using a KDS, check DTC Using a KDS, clear stored DTC. Operate the vehicle within "DTC Detecting Condition" in "DTC Information". Select "Diagnostic Trouble Codes (DTC)" mode again. Is the same DTC stored in the system?	-

Good

Fault might be intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and control module memory is not cleared yet. Thoroughly check terminal of 12V battery, all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
Repair or replace as necessary and go to "VERIFICATION OF REPAIR " procedure.

No Good

Carefully re-do this troubleshooting procedure steps.
If no problems were found with the circuits or connectors, replace the HECU and go to "VERIFICATION OF REPAIR " procedure.