Code No. U0101
T/M CAN timeout
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- If there is any problem in the
CAN bus lines, an incorrect diagnosis 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.
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OPERATION
FCM/LDW/AHB-ECU communicates with the CVT-ECU, A/T-ECU via
the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality below is detected:
- The signal sent from the CVT-ECU, A/T-ECU cannot be received for
a certain period.
PROBABLE CAUSES
- Malfunction of the CAN bus line
- Malfunction of the CVT-ECU, A/T-ECU power supply circuit
- Malfunction of the CVT-ECU, A/T-ECU
- Malfunction of the FCM/LDW/AHB-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting 
).
STEP 2. M.U.T.-III other system diagnosis code.
Check if the diagnosis code No. U0101 is set to other ECU.
Q.
Is the diagnosis code set?
Go to Step 3.
Go to Step 4.
STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the FCM/LDW/AHB-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the CVT-ECU (Refer to GROUP 23A - CVT-ECU) or the A/T-ECU
(Refer to GROUP 23C - A/T-ECU).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).
STEP 4. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the FCM/LDW/AHB-ECU.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace the FCM/LDW/AHB-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).