If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
If DTC U1073 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set. In this case, the set DTC is not highly reliable.
Whenever ECU is replaced, ensure that the CAN bus lines are normal.
DTC SET CONDITIONS
This DTC is set when ASC-ECU has ceased the CAN communication (bus off).
COMMENTS ON TROUBLE SYMPTOM
Malfunction of wiring harness, connector (s), or ASC-ECU may be present.
PROBABLE CAUSES
Wiring harness or connector failure of CAN bus line
ASC-ECU malfunction
Other ECU malfunction
DIAGNOSIS
1. Check scan tool (M.U.T.-IIISE) CAN bus diagnosis
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