Inspection Procedure 1: Communication with the M.U.T.-III is not Possible (CVT-ECU cannot be turned ON).














SYMPTOMS



PROBABLE CAUSES



  • Damaged wiring harness and connectors
  • Malfunction of CVT-ECU

SYMPTOMS



PROBABLE CAUSES



  • Damaged wiring harness and connectors
  • Malfunction of CVT-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the following connector:

  • A-17X CVT control relay connector
  • C-35 CVT-ECU connector
Check each terminal for imperfect contact.

Q. 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 CVT control relay connector and the CVT-ECU connector.

  • Between A-17X CVT control relay connector (terminal No. 3) and C-35 CVT-ECU connector (terminal No. 12)
  • Between A-17X CVT control relay connector (terminal No. 3) and C-35 CVT-ECU connector (terminal No. 25)

Q. 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 CVT-ECU connector and the body earth.

  • Between C-35 CVT-ECU (terminal No. 13) and body earth
  • Between C-35 CVT-ECU (terminal No. 26) and body earth

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

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

Q. Does the malfunction take place again?
Replace CVT-ECU.
Intermittent malfunction