Inspection Procedure 1: Cannot communicate with KOS-ECU using the M.U.T.-III


caution When replacing the ECU, always check that the communication circuit is normal.

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the power supply and the earth of KOS-ECU
  • 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 KOS-ECU



Q. Is the check result normal?





STEP 3. Retest the system



Q. Is the check result normal?