Code No.U1073 Bus off


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

TROUBLE JUDGMENT



COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Damaged harness wires and connectors
  • Malfunction of combination meter

DIAGNOSIS PROCEDURE


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



Q. Is the check result normal?





STEP 2. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the ignition switch to "ON" position.
(3)On completion, check that the diagnosis code is not reset.

Q. Is the diagnosis code set?





STEP 3. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the ignition switch to "ON" position.
(3)On completion, check that the diagnosis code is not reset.

Q. Is the diagnosis code set?