Code No.U0101 T/M CAN timeout


caution
  • If diagnosis code No. U0101 is set, be sure to diagnose the CAN bus line.
  • Before replacing ECU, ensure that the communication circuit is normal.

DIAGNOSTIC FUNCTION


When the signal from the CVT-ECU cannot be received, KOS&OSS-ECU sets diagnosis code No.U0101.

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 ).

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


Check whether the CVT-ECU sets 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 diagnosis code No. U0101 is set in the combination meter.

Q. Is the diagnosis code set?

Go to Step 4.

Go to Step 5.

STEP 4. Check whether the diagnosis code is set again.


Check again if the diagnosis code is set in the KOS&OSS-ECU.
(1)Erase the diagnosis code.
(2)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is set again.

Q. Is the diagnosis code set?

Replace the CVT-ECU. After replacing the ECU, carry out the CAN bus diagnostics.

A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the CVT-ECU and the KOS&OSS-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 set again.


Check again if the diagnosis code is set in the KOS&OSS-ECU.
(1)Erase the diagnosis code.
(2)Turn the engine switch from "LOCK" (OFF) position to "ON" position.
(3)On completion, check that the diagnosis code is not set again.

Q. Is the diagnosis code set?

Replace the KOS&OSS-ECU and register the ID codes (Refer to ).

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