Inspection Procedure 1: TCM Cannot Communication With M.U.T.-III
SYMPTOM PROCEDURESInspection 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-38 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 C-38 TCM connector (terminal No.12)
^ Between A-18X CVT control relay connector (terminal No.3) and C-38 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-38 TCM (terminal No.13) and ground
^ Between C-38 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