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

DIAGNOSTIC PROCEDURE


STEP 1. Check the following connector:



  • C-136 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 relay box and the CVT-ECU connector.



  • Between relay box and C-136 CVT-ECU connector (terminal No. 12)
  • Between relay box and C-136 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-136 CVT-ECU (terminal No. 13) and body earth
  • Between C-136 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