Code No. U1101
T/M CAN timeout
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- If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table
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- If diagnosis code U1101 is stored in ASC-ECU, always diagnose the CAN bus line.
If there is any fault in the CAN bus lines, an incorrect diagnosis code may be stored. In this
case, the stored diagnosis code is not highly reliable.
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out
the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).
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OPERATION
The ASC-ECU communicates with the CVT-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
The ASC-ECU receives the CVT control-related signals from the CVT-ECU via the CAN bus
lines. When these signals cannot be received, the ECU stores this diagnosis code.
PROBABLE CAUSES
- Malfunction of ETACS-ECU
- The ASC-ECU, which was used on another vehicle, is installed on this vehicle.
- The ETACS-ECU, which was used on another vehicle, is installed on this vehicle.
- The CAN bus line is defective.
- The CVT-ECU is defective.
- Malfunction of the hydraulic unit assembly (integrated with ASC-ECU)
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STEP 1. M.U.T.-III CAN bus diagnosis
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines
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Q.
Is diagnosis code No. U1101 stored?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check if the diagnosis code is stored in the CVT-ECU (Refer to GROUP 23A - Diagnosis
Code Chart ).
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Q.
Is the diagnosis code stored?
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Follow the relevant diagnosis code procedure. Then go to Step 8.
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Go to Step 4.
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STEP 4. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check whether an transmission "time-out" related diagnosis code is stored in other ECUs.
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Q.
Is the diagnosis code stored?
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Replace the CVT-ECU (Refer to GROUP 23A - CVT-ECU ).
Then go to Step 8.
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Go to Step 5.
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STEP 5. ETACS-ECU coding data check
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Use M.U.T.-III, check if any abnormality is present to the coding data which are stored
in the ETACS-ECU (Refer to GROUP 00 - Coding Reference Table <Vehicles
for GCC>, <Vehicles for THAILAND>).
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Q.
Is the check result normal?
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Go to Step 6.
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Replace ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).
Then go to Step 8.
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STEP 6. Check part number of ASC-ECU
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Check the part number of ASC-ECU.
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Q.
Is the check result normal?
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Go to Step 7.
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then
go to Step 8.
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STEP 7. Check whether the diagnosis code is stored again.
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Check again if the diagnosis code is stored.
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(1)Erase the stored diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U1101 stored?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then
go to Step 8.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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STEP 8. Check whether the diagnosis code is stored again.
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Check again if the diagnosis code is stored.
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(1)Erase the stored diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U1101 stored?
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Return to Step 3.
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This diagnosis is complete.
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