Code No. U1073: Bus-off <Vehicle with FCM-LS>


caution
  • If diagnosis code U1073 is set in the engine-ECU, surely perform CAN bus line diagnosis.
  • Replace ECU after certainly confirming that the communication circuits are normal.

FUNCTION



TROUBLE JUDGEMENT


Check Conditions
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION



PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis

  • Use M.U.T.-III to perform CAN bus line diagnosis.

Q. Is the check result normal?
Intermittent malfunction in CAN bus line between engine-ECU and ASC-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Troubleshoot the CAN (Refer to GROUP 54C - Troubleshooting - CAN Bus Diagnosis Table ).