STEP 1. Check for short circuit in power supply line between the fusible link and the A/T control relay connector.
STEP 2. Check for short circuit in VIG1, VIG2 line between the A/T control relay connector and the TCM connector.
STEP 3. Check for open circuit in GND1, GND2 line between the TCM connector and ground.
STEP 4. Retest the system.
Recheck the trouble symptom.Does the malfunction take place again?
Replace TCM. Intermittent malfunction.