S-AWC (Super All Wheel Control)

Code No.U0401: Engine Data Malfunction

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble 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.

OPERATION

AWC-ECU communicates with the ECM via the CAN bus lines.

DIAGNOSTIC TROUBLE CODE SET CONDITIONS

The code is set when abnormality is detected in the signal received from the ECM.

PROBABLE CAUSES

- Malfunction of the CAN bus line

- Engine malfunction

- Malfunction of ECM

- Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

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

Use scan tool to perform the CAN bus diagnosis.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart).
STEP 2. M.U.T.-III diagnostic trouble code.

Check the engine diagnostic trouble code. Multiport Fuel Injection (MFI)).

Q. Is the diagnostic trouble code set?

YES Perform the relevant troubleshooting.
NO Go to Step 3.
STEP 3. M.U.T.-III data list.

Check the following data list. (Refer to Data List Reference Table).

- Item No.12: Engine speed

- Item No.13: Engine torque (Driver request value)

Q. Is the check result normal?

YES Intermittent malfunction. How to Cope With Intermittent Malfunctions).
NO Go to Step 4.
STEP 4. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.U0401 set?

YES Replace the AWC-ECU. (Refer to AWC-ECU Removal and Installation). Then go to Step 5.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions).
STEP 5. Check whether the diagnostic trouble code is reset.

Q. Is diagnostic trouble code No.U0401 set?

YES Return to Step 1.
NO This diagnosis is complete.