Inspection Procedure 1: M.U.T.-III cannot communicate with WCM.


caution Before replacing the ECU, ensure that the communication circuit is normal.

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the power supply and the earth of WCM
  • Malfunction of CAN bus line

DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics



Q. Is the check result normal?





STEP 2. Check the power supply circuit and the earth circuit to WCM.



Q. Is the check result normal?





STEP 3. Retest the system



Q. Is the check result normal?