Code No. U1073: Bus-Off


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

DIAGNOSIS CODE SET CONDITIONS


The code is set when AWC-ECU ceases (bus-off).

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting). After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the diagnosis code is set again.

Q. Is diagnosis code No.U1073 set?
Replace the AWC-ECU. (Refer to ). Then go to Step 3.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction).

STEP 3. Check whether the diagnosis code is set again.

Q. Is diagnosis code No.U1073 set?
Return to Step 1.
This diagnosis is complete.