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Code No. U1073: Bus-off
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • If the EPS-ECU stores diagnostic trouble code No. U1073, diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be stored.
  • Before replacing ECU, ensure that the communication circuit is normal.
 
 
TROUBLE JUDGMENT
This code is stored when the EPS-ECU has ceased the CAN communication (bus off). Then, if a penalty mode is entered after approximately five minutes, regular data transmission will be cancelled.
 
 
COMMENT ON TROUBLE SYMPTOM
The wiring harness, connector, or EPS-ECU may be faulty.
 
 
PROBABLE CAUSES
  • Defective wire(s) or connector(s) in the CAN bus lines
  • Malfunction of the EPS-ECU