3.
Does warning lamp remain On?
YES
a.
Substitute with a known-good TCU and check for proper operation. If problem is corrected, replace TCU and then go to "Verification of Vehicle Repair" procedure. If NG, replace HECU and then go to "Verification of Vehicle Repair" procedure.
NO
a.
Fault is intermittent caused by faulty TCU and/or faulty HECU or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
