Code No.U0431: ETACS CAN Message



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.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in GROUP 54A, Immobilizer System - How to Register Key ID .)

OPERATION


4WD-ECU communicates with the ETACS-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITION


This diagnosis code is set when the abnormality below is detected:


PROBABLE CAUSES




DIAGNOSIS PROCEDURE


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


Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?

Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).

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


Check if diagnosis code No.U1195 is set (Refer to ).

Q. Is the diagnosis code set?

Perform the relevant troubleshooting.
Go to Step 3.

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


Check the ETACS diagnosis code (Refer to GROUP 54A - Troubleshooting ).

Q. Is the diagnosis code set?

Perform the relevant troubleshooting.
Go to Step 4.

STEP 4. M.U.T.-III data list.


Check the ETACS data list below (Refer to GROUP 54A - ETACS ).

  • Item No.252: Ambient temperature sensor
  • Item No.254: IG voltage

Q. Is the check result normal?

Go to Step 5.
Replace the ETACS-ECU. Then go to Step 5.

STEP 5. Check whether the diagnosis code is reset.


Q. Is diagnosis code No.U0431 set?

Replace the 4WD-ECU (Refer to ). Then go to Step 6.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is reset.


Q. Is diagnosis code No.U0431 set?

Return to Step 1.
This diagnosis is complete.