Code No.U0101
T/M CAN timeout
| caution |
- If diagnosis
code U0101 is set in the combination meter, always diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the communication circuit is normal.
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TROUBLE JUDGMENT
The combination meter receives transmission control system-related signal from the CVT-ECU
via CAN bus lines. If the display unit can not receive the necessary signals, diagnosis code
U0101 will be set.
JUDGEMENT CRITERIA
With the ignition switch is at ON position, the diagnosis code No. U1190 is not stored
and the diagnosis code No. U1195 is not stored, if the communication with CVT-ECU cannot be
established for 2500 ms or more, the combination meter determines that a problem has occurred.
COMMENTS ON TROUBLE SYMPTOM
Current trouble
- Connector(s) or wiring harness in the CAN bus lines between the CVT-ECU and the
combination meter, the power supply system to the CVT-ECU, the CVT-ECU itself, or the combination
meter may be defective.
Past trouble
- Carry out diagnosis with particular emphasis on connector(s) or wiring harness in
the CAN bus lines between the CVT-ECU and the combination meter, and the power supply system
to the CVT-ECU. For diagnosis procedures, refer to "How to cope with past trouble" (Refer to
GROUP 00 - How to Use Troubleshooting/Inspection Service Points
).
| note |
For a past trouble, you may not find it by the M.U.T.-III CAN bus diagnostics even if
there is any failure in CAN bus lines. In this case, refer to GROUP 00, How to Use Troubleshooting/Inspection
Service Points , and check the CAN bus lines. You can narrow
down the possible cause of the trouble by referring to the diagnosis code, which is set regarding
the CAN communication-linked ECUs (Refer to GROUP 54C - CAN Bus Line Diagnostic Flow ).
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PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of CVT-ECU
- Malfunction of combination meter
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 lines. (Refer to GROUP 54C - Troubleshooting ).
Repair the CAN bus line and go to Step 6.
STEP 2. M.U.T.-III other system diagnosis code
Check whether the CVT system diagnosis codes are set or not.
Q.
Is the diagnosis code set?
Diagnose the CVT system (GROUP 23A - Troubleshooting ).
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN communication-linked systems below, is
set.
ETACS-ECU
- Code No.U1101: CVT-ECU time-out diagnosis code
Q.
Is the diagnosis code set?
Go to Step 4.
Go to Step 5.
STEP 4. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)On completion, check that the diagnosis code is not reset.
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Q.
Is the diagnosis code set?
Replace CVT-ECU and 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 combination meter (Refer to GROUP 00 - How
to use troubleshooting/Inspection Service Points ).
STEP 5. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)On completion, check that the diagnosis code is not reset.
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Q.
Is the diagnosis code set?
Replace combination meter and 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 combination meter (Refer to GROUP 00 - How
to use troubleshooting/Inspection Service Points ).
STEP 6. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)On completion, check that the diagnosis code is not reset.
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Q.
Is the diagnosis code set?
Go to Step 1.
The procedure is complete.