Code No. U1109: ETACS CAN time-out/not installed



caution If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.


OPERATION



  • ETACS-ECU communicates with EV-ECU via CAN.

DIAGNOSIS CODE SET CONDITIONS



  • When the CAN data cannot be received from ETACS-ECU, the diagnosis code No. U1109 will be set.

PROBABLE CAUSES



  • Damaged wiring harness or connector(s)
  • Malfunction of the ETACS-ECU CAN data system
  • Malfunction of the EV-ECU

DIAGNOSIS PROCEDURE


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


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

Q. Is the check result normal?

Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .) Then go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines


Check again if the diagnosis code No. U1109 is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Go to Step 3.
This diagnosis is complete.

STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.


Check if diagnosis code is set to the ETACS-ECU.

Q. Is the diagnosis code set?

Carry out troubleshooting for the ETACS-ECU. (Refer to GROUP 54A - ETACS - Diagnosis Code Chart .)
Go to Step 4.

STEP 4. M.U.T.-III Diagnosis code of other systems


Check if the diagnosis code No. U1109 is set to the combination meter.

Q. Is the diagnosis code set?

Go to Step 5.
Go to Step 6.

STEP 5. Diagnosis code recheck


Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the ETACS-ECU.
A poor connection, open circuit of the wiring harness or other intermittent malfunction is present in the CAN bus line between the ETACS-ECU and EV-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Handle Intermittent Malfunction )

STEP 6. Diagnosis code recheck


Check again if the diagnosis code is set to the EV-ECU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the EV-ECU. (Refer to .)
A poor connection, open circuit of the wiring harness or other intermittent malfunction is present in the CAN bus line between the ETACS-ECU and EV-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Handle Intermittent Malfunction )