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 TCL/ASC-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 TCL/ASC-ECU cannot receive the signal sent from ETACS ECU for a certain period.

PROBABLE CAUSES

Wiring harness or connector failure of CAN bus line
TCL/ASC-ECU malfunction
ETACS-ECU malfunction

DIAGNOSIS PROCEDURE

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

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 3.

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 TCL/ASC-ECU) (Refer to ).

	The procedure is complete.