Inspection Procedure 1: TCM Cannot Communication With M.U.T.-III

Inspection Procedure 1: TCM cannot communication with 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 the following connector:
^ A-18X CVT control relay connector
^ C-41 TCM connector
Check each terminal for imperfect contact.

Q: Is the check result normal?
YES: Go to Step 2.
NO: 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-18X CVT control relay connector (terminal No.3) and C41 TCM connector (terminal No.12)
^ Between A-18X CVT control relay connector (terminal No.3) and C41 TCM connector (terminal No.25)

Q: Is the check result normal?
YES: Go to Step 3.
NO: Repair the wiring harness.

STEP 3. Check for open circuit in the wiring harness between the TCM connector and the ground.
^ Between C-41 TCM (terminal No.13) and ground
^ Between C-41 TCM (terminal No.26) and ground

Q: Is the check result normal?
YES: Go to Step 4.
NO: Repair the wiring harness.

STEP 4. Retest the system.
Recheck the trouble symptom.

Q: Does the malfunction take place again?
YES: Replace TCM.
NO: Intermittent malfunction