Code No.U1101 T/M CAN timeout/Not equipped


caution
  • If diagnosis code No.U1101 is set in the ETACS-ECU, diagnose the CAN main bus line.
  • Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

TROUBLE JUDGEMENT


If signal from the CVT-ECU cannot be received for 500 milliseconds or more, the ETACS-ECU sets diagnosis code No. U1101.

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 ). On completion, go to Step 6.

STEP 2. Check the M.U.T.-III Diagnosis code for other systems


Check that the CVT-ECU set a diagnosis code.

Q. Is the diagnosis code set?

Diagnose the CVT-ECU. Refer to GROUP 23A, Troubleshooting .

Go to Step 3.

STEP 3. Check the M.U.T.-III Diagnosis code for other systems


Check if the diagnosis code No. U0101 is set to combination meter.

Q. Is the diagnosis code set?

Go to Step 4.

Go to Step 5.

STEP 4. 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)On completion, check that the diagnosis code is reset.

Q. Is the diagnosis code set?

Replace the CVT-ECU. After replacing the ECU, carry out the CAN bus diagnostics. Then go to Step 6.

A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the CVT-ECU and the ETACS-ECU (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

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)On completion, check that the diagnosis code is not reset.

Q. Is the diagnosis code set?

Replace the ETACS-ECU. After replacing the ECU, carry out the CAN bus diagnostics. Then go to Step 6.

A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the CVT-ECU and the ETACS-ECU (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 6. Check whether the diagnosis code is reset.


Recheck 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)On completion, check that the diagnosis code is reset.

Q. Is the diagnosis code set?

Return to Step 1.

The procedure is complete.