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DTC U1073 Bus-off
 
 
caution
  • 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 ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
OPERATION
Signals from the ECUs communicate with the EPS-ECU.
 
 
 
FUNCTION
The signals from the ECUs communicate with the EPS-ECU for motor control.
 
 
 
TROUBLE JUDGMENT
Check Conditions
  • IG1 voltage: 10 V or more
Judgment Criterion
  • The signals from the ECUs cannot communicate (bus off), and the microcomputer determines that there is a problem in the system.
Fail Safe, Back Up Function
  • The EPS-ECU displays the electric power steering warning symbol, and sets DTC No. U1073.
 
 
 
TROUBLESHOOTING HINTS
  • Malfunction of CAN bus line
  • Malfunction of the EPS-ECU