S-AWC (Super All Wheel Control)

DTC U0101: TC-SST Time-out Error

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 TC-SST-ECU via the CAN bus lines.

DTC SET CONDITIONS

The code is set when the signal sent from the TC-SST-ECU cannot be received for a certain period.

PROBABLE CAUSES

- The CAN bus line is defective.
- Malfunction of TC-SST-ECU
- ETACS coding data error
- Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics

Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart.)
STEP 2. Scan tool diagnostic trouble code

Check the TC-SST diagnostic trouble code. Twin Clutch-Sportronic Shift Transmission (TC-SST).)

Q. Is the DTC set?

YES Perform the relevant troubleshooting.
NO Go to Step 3.
STEP 3. ETACS-ECU coding data check

Check the transaxle coding data stored in ETACS-ECU for any abnormality. Programming and Relearning.)

Q. Is the check result normal?

YES Go to Step 4.
NO Replace the ETACS-ECU. Electronic Time and Alarm Control System (ETACS) Then go to Step 5.
STEP 4. Check whether the DTC is reset.

Q. Is DTC No. U0101 set?

YES Replace the AWC-ECU.(Refer to Active Center Differential (ACD).) Then go to Step 5.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)
STEP 5. Check whether the DTC is reset.

Q. Is DTC No. U0101 set?

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