Inspection Procedure 1: Cannot communicate with KOS-ECU using the scan tool.
caution
When replacing the ECU, always check that the communication circuit is normal.
TECHNICAL DESCRIPTION (COMMENT)
KOS-ECU is communicating with scan tool via CAN. Therefore, communication error of KOS-ECU is suspected.
TROUBLESHOOTING HINTS
Malfunction of the power supply and the ground of KOS-ECU
Malfunction of CAN bus line
DIAGNOSIS
1.
Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
2.
Check the power supply circuit and the ground circuit to KOS-ECU.
Refer to Inspection Procedure 3 "Abnormality in KOS-ECU power supply and ground circuits"
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3.
Retest the system.
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