Code No.U1073 Bus Off


caution
  • If diagnosis code U1073 is set in the multi display station, always diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the communication circuit is normal.

TROUBLE JUDGMENT



COMMENTS ON TROUBLE SYMPTOM



POSSIBLE CAUSES



  • Damaged harness wires and connectors
  • Malfunction of multi display station

DIAGNOSIS PROCEDURE


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



Q. Is the check result satisfactory?





STEP 2. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the ignition switch to "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the check result satisfactory?





STEP 3. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the ignition switch to "ON" position.
(3)Check if the diagnosis code is set.

Q. Is the check result satisfactory?