Code No.U1109: ETACS CAN time-out


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 (Refer to GROUP 54C, Trouble code diagnosis ).
  • If diagnosis code U1109 is set in ABS-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case, the set diagnosis code is not highly reliable.
  • Before replacing the ECU, ensure that the communication circuit is normal.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if ABS-ECU cannot receive the signal sent from ETACS ECU for a certain period.

COMMENTS ON TROUBLE SYMPTOM
Malfunction of wiring harness, connector (s), or ABS-ECU may be present.

PROBABLE CAUSES

  • Wiring harness or connector failure of CAN bus line
  • ABS-ECU malfunction
  • ETACS-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis table ). On completion, go to Step 4.

STEP 2. Check whether the diagnosis code is reset.

Q. Is Code No. U1109 set?
Go to Step 3.
The procedure is complete.

STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check that other diagnosis code is set in the ECU corresponding to the relevant diagnosis.

Q. Is other diagnosis code set?
Troubleshoot for the relevant diagnosis code.
Go to Step 4.

STEP 4. M.U.T.-III diagnosis code
Use M.U.T.-III to check if the same diagnosis code (time-out) is set in the Engine-ECU or the Engine-A-M/T-ECU or the combination meter or the A/C-ECU.

Q. Is any diagnosis code set?
Replace the ETACS-ECU, and then go to Step 5.
Go to Step 5.

STEP 5. Check whether the diagnosis code is reset.

Q. Is Code No. U1109 set?
Replace the hydraulic unit (integrated with ABS-ECU) (Refer to ).
The procedure is complete.