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Inspection Procedure 1: TCM cannot communication with scan tool.
 
 

 
 
SYMPTOMS
TCM cannot be turned ON.
 
 
PROBABLE CAUSES
  • Damaged wiring harness and connectors
  • Malfunction of TCM
 
 
DIAGNOSIS
STEP 1. Check the following connector:
  • A-69X CVT control relay connector
  • C-131 TCM connector
Check each terminal for imperfect contact.
Is the check result normal?
Go to Step 2.
Repair the defective connector.
 
STEP 2. Check for open circuit in the wiring harness between the relay box connector and the TCM connector.
  • Between A-69X CVT control relay connector (terminal No.3) and C-131 TCM connector (terminal No.12)
  • Between A-69X CVT control relay connector (terminal No.3) and C-131 TCM connector (terminal No.25)
Is the check result normal?
Go to Step 3.
Repair the wiring harness.
 
STEP 3. Check for open circuit in the wiring harness between the TCM connector and the ground.
  • Between C-131 TCM (terminal No.13) and ground
  • Between C-131 TCM (terminal No.26) and ground
Is the check result normal?
Go to Step 4.
Repair the wiring harness.
 
STEP 4. Retest the system.
Recheck the trouble symptom.
Does the malfunction take place again?
Replace TCM.
Intermittent malfunction