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

KOS-ECU is communicating with M.U.T.-III via CAN. Therefore, communication error of KOS-ECU is suspected.

PROBABLE CAUSES

Malfunction of the power supply and the earth of KOS-ECU
Malfunction of CAN bus line

DIAGNOSIS PROCEDURE

1.M.U.T.-III CAN bus diagnostics.
2.Check the power supply circuit and the earth circuit to KOS-ECU.
Refer to Inspection Procedure 3 "Abnormality in KOS-ECU power supply and earth circuits"

.
3.Retest the system.