Automatic Transmission

DTC U0141: ETACS-ECU Time Out

DESCRIPTIONS OF MONITOR METHODS

- Open circuit or short circuit occurs in the CAN communication line (CAN_H, CAN_L).

- Reception from ETACS-ECU becomes impossible for 0.5 seconds or more.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)

- Damaged harness or connector

- Malfunction of the CAN communication

- Malfunction of the ETACS-ECU

- Malfunction of the TCM

DIAGNOSIS

STEP 1. Check the CAN communication system malfunction.

- Check that the CAN system-related DTC code other than U0141 is set.

- Check if the CAN-related DTC is set with ETACS-ECU.

- Check if the failure related to the ETACS occurs.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair or replace the failure section.
STEP 2. Check the CAN communication lines.

[C-38 TCM connector (vehicle side, disconnected)]

Between C-38 terminal No. 10, 11 and the CAN communication lines of ETACS-ECU: Continuity exists.

When the continuity check result is OK, check that the wiring harness is not shorted to the body and other wiring harness. Also, check for a short circuit between the twisted pair cables.

Q. Is the check result normal?

YES Go to Step 3.
NO Repair or replace the failure section.
STEP 3. Check the ETACS-ECU, the TCM connector pin terminal, and the connection status.

Q. Is the check result normal?

YES Repair or replace the failure section.
NO Replace the TCM.