Code No.U1073 Bus-off


caution
  • If diagnosis code No.U1073 is set in the ETACS-ECU, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

TROUBLE JUDGEMENT



PROBABLE CAUSES



  • Malfunction of the ETACS-ECU
  • Malfunction of wiring harness or connector

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 electric motor switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is reset.

Q. Is the diagnosis code set?





STEP 3. Check whether the diagnosis code is reset.



(1)Erase the diagnosis code.
(2)Turn the electric motor switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is reset.

Q. Is the diagnosis code set?