Code No.U0245 AND CAN timeout



caution
  • If the diagnosis code No. U0245 is set to the ETACS-ECU, always diagnose the CAN bus line.
  • Before replacing the ECU or CAN box unit (MMCS), ensure that the power supply circuit, the earth circuit and the communication circuit 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 Immobilizer System - How to Register Key ID .)

DIAGNOSTIC FUNCTION


When the signals from CAN box unit (MMCS) cannot be received, the ETACS-ECU sets the diagnosis code No. U0245.

JUDGEMENT CRITERIA


After the following statuses continue to be true for 5 seconds, if the communication with the CAN box unit (MMCS) be established for 2,500 ms or more, the ETACS-ECU determines that a problem has occurred.


PROBABLE CAUSES




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 line (Refer to GROUP 54C - Troubleshooting ).

STEP 2. Confirm the option coding.


Confirm whether the option coding corresponds to an actual vehicle equipment. For how to confirm, refer to .

Q. Is the check result normal?

Go to Step 3

Configure the option coding again.

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


Check if diagnosis code is set to the CAN box unit (MMCS).

Q. Is the diagnosis code set?

Perform the diagnosis code troubleshooting to the CAN box unit (MMCS).

Go to Step 4

STEP 4. M.U.T.-III other system diagnosis code


Check if the diagnosis code No. U0245 is set to the KOS-ECU.

Q. Is the diagnosis code set?

Go to Step 5

Go to Step 6

STEP 5. Check whether the diagnosis code is reset.


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

Q. Is the diagnosis code set?

Replace the CAN box unit (MMCS).

The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the CAN box unit (MMCS) and the ETACS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is reset.


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

Q. Is the diagnosis code set?

Replace the ETACS-ECU.

The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the CAN box unit (MMCS) and the ETACS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).