Code No. U0141: 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, always diagnose the CAN bus lines.
  • Before replacing the ECU, ensure that the communication circuit is normal.


OPERATION


4WD-ECU receives the data (such as drive mode display signal, failure information signal) from ETACS-ECU via the CAN bus lines. If it cannot receive such data, illuminates the 4WD indicator.

DIAGNOSIS CODE SET CONDITIONS


If the following conditions are met when the system is in operation (always), 4WD-ECU flashes the 4WD/LOCK indicators alternately, and sets the diagnosis code No. U0141.


PROBABLE CAUSES


Current trouble
Past trouble

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 line. (Refer to GROUP 54C - Troubleshooting .) Then go to Step 2.

STEP 2. M.U.T.-III data list


Check the following service data. (Refer to .)

  • Item 09: CAN system (ETACS)

Q. Is the check result normal?

Go to Step 6.
Go to Step 3.

STEP 3. M.U.T.-III Diagnosis code of other systems


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

  • Meter
    U0141: ETACS CAN time-out diagnosis code
  • A/C
    U0141: ETACS CAN time-out diagnosis code

  • Engine
    U0141: ETACS CAN time-out diagnosis code

Q. Is the diagnosis code set?

Go to Step 4.
Go to Step 5.

STEP 4. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code No. U0141 set?

Replace ETACS-ECU. Then go to Step 6.
A poor connection, open circuit or other intermittent malfunction in the CAN bus lines between ETACS-ECU and 4WD-ECU is suspected. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code No. U0141 set?

Replace 4WD-ECU. (Refer to .) Then go to Step 6.
A poor connection, open circuit or other intermittent malfunction in the CAN bus lines between ETACS-ECU and 4WD-ECU is suspected. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is reset.


Q. Is the diagnosis code No. U0141 set?

Diagnose again from Step 1.
This diagnosis is complete.