Code No.U1113 EV Remote CAN timeout



caution If the diagnosis code No. U1113 is stored in the A/C control unit, be sure to carry out the CAN bus line diagnosis.
caution Before replacing ECU, ensure that the communication circuit is normal.

TROUBLE JUDGEMENT


The heater controller assembly (A/C-ECU) will store diagnosis code U1113 when it can receive no signals from the EV remote-ECU.

JUDGEMENT CRITERIA


The system will determines that the heater controller assembly (A/C-ECU) is defective when the heater controller assembly (A/C-ECU) remains under the conditions below for five seconds and then cannot communicate with the EV remote-ECU for at least 600 ms.

  • No abnormality is present to the network.
  • The power supply mode of the electric motor switch is ON.
  • No abnormality is present to the power supply fuse, or the odometer value is at 80.5 km or more.

PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Malfunction of EV remote-ECU
  • Malfunction of heater controller assembly (A/C-ECU)

DIAGNOSIS PROCEDURE


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


Use the 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, Troubleshooting ). On completion, go to Step 6.

STEP 2. M.U.T.-III other system diagnosis code


Check whether the EV remote-ECU-related diagnosis code is stored.

Q. Is the diagnosis code stored?

Diagnose the EV remote-ECU. Troubleshooting the EV remote-ECU (Refer to GROUP 54A Troubleshooting).
Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code


Check if a diagnosis code, which relates to CAN communication-linked systems below, is stored.

  • ETACS-ECU
    U1113: EV remote CAN timeout

Q. Is the diagnosis code stored?

Go to Step 4.
Go to Step 5.

STEP 4. Check whether the diagnosis code is stored again.


Recheck if the diagnosis code is stored.
(1)Erase the diagnosis code.
(2)Turn the power supply mode of the electric motor switch to ON.
(3)Check if the diagnosis code is stored.

Q. Is the diagnosis code stored?

Replace the EV remote-ECU, and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the EV remote-ECU and the heater controller assembly (A/C-ECU) (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is stored again.


Recheck if the diagnosis code is stored.
(1)Erase the diagnosis code.
(2)Turn the power supply mode of the electric motor switch to ON.
(3)Check if the diagnosis code is stored.

Q. Is the diagnosis code stored?

Replace the heater controller assembly (A/C-ECU), and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the EV remote-ECU, and the heater controller assembly (A/C-ECU) (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is stored again.


Recheck if the diagnosis code is stored.
(1)Erase the diagnosis code.
(2)Turn the power supply mode of the electric motor switch to ON.
(3)Check if the diagnosis code is stored.

Q. Is the diagnosis code stored?

Return to Step 1.
The procedure is complete.