DTC U0101: T/M CAN Timeout
caution
If there is any problem in the CAN bus lines, an incorrect DTC may be stored. 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 TCM via the CAN bus lines.
DTC SET CONDITION
This DTC is stored when the abnormality below is detected:
The signal sent from the TCM cannot be received for a certain period.
PROBABLE CAUSES
Malfunction of the CAN bus line
Malfunction of power supply circuit system (TCM)
Malfunction of TCM
Malfunction of AWC-ECU
ETACS coding failure
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics.
Use scan tool (M.U.T.-III) to perform the CAN bus diagnosis.
Is the check result normal?
Go to Step 2
.
Repair the CAN bus lines (Refer to GROUP 54C - Diagnosis, Can Bus Diagnostics Table
).
STEP 2. Scan tool (M.U.T.-III) other system DTC.
Check the transaxle other DTC (Refer to
).
Is the DTC stored?
Perform the relevant troubleshooting.
Go to Step 3
.
STEP 3. ETACS-ECU coding data check.
Check the transaxle coding data stored in ETACS-ECU for any abnormality (Refer to GROUP 00 - Coding List
).
Is the check result normal?
Go to Step 4
.
Replace the ETACS-ECU. Then go to Step 5
.
STEP 4. Check whether the DTC is stored again.
Is DTC No.U0101 stored?
Replace the AWC-ECU (Refer to
). Then go to Step 5
.
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction
).
STEP 5. Check whether the DTC is stored again.
Is DTC No.U0101 stored?
Return to Step 1
.
This diagnosis is complete.