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Inspection Procedure 1: TCM cannot communicate with scan tool (M.U.T.-III).
 
 
 
 
SYMPTOMS
TCM cannot be turned ON.
 
 
PROBABLE CAUSES
  • Damaged wiring harness and connectors
  • Malfunction of TCM
 
 
DIAGNOSTIC PROCEDURE
STEP 1. Check for short circuit in power supply line between the fusible link and the A/T control relay connector.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
 
STEP 2. Check for short circuit in VIG1, VIG2 line between the A/T control relay connector and the TCM connector.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check for open circuit in GND1, GND2 line between the TCM connector and ground.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Retest the system.
Recheck the trouble symptom.
Does the malfunction take place again?
Replace TCM.
Intermittent malfunction.