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.