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Code No. U1101 T/M CAN timeout/Not equipped
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table ).
  • If diagnostic trouble code U1101 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be set. In this case, the set diagnostic trouble 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 ).
 
 
OPERATION
The ASC-ECU communicates with the CVT-ECU via the CAN bus lines.
 
 
DIAGNOSTIC TROUBLE 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 sets this diagnostic trouble 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)
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus lines.
Use scan tool (M.U.T.-III) to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus line (Refer to GROUP 54C, Troubleshooting ). On completion, go to Step 2.
 
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
Is diagnostic trouble code No. U1101 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Use scan tool (M.U.T.-III) to confirm a diagnostic trouble code of other systems.
Check if the diagnostic trouble code is set in the CVT-ECU (Refer to GROUP 23A, Diagnostic Trouble Code Chart ).
Is the diagnostic trouble code set?
Follow the relevant diagnostic trouble code procedure. Then go to Step 8.
Go to Step 4.
 
STEP 4. Use scan tool (M.U.T.-III) to confirm a diagnostic trouble code of other systems.
Check whether an transmission "time-out" related diagnostic trouble code is set in other ECUs.
Is the diagnostic trouble code set?
Replace the CVT-ECU (Refer to GROUP 23A, CVT-ECU ). Then go to Step 8.
Go to Step 5.
 
STEP 5. ETACS-ECU coding data check
Using scan tool (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 ).
Is the check result normal?
Go to Step 6.
Replace ETACS-ECU (Refer to GROUP 54A, ETACS-ECU ). Then go to Step 8.
 
STEP 6. Check part number of ASC-ECU
Check the part number of ASC-ECU.
Is the check result normal?
Go to Step 7.
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 8.
 
STEP 7. Check whether the diagnostic trouble code is set again.
Check again if the diagnostic trouble code is set.
(1) Erase the set diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF)
(3) Ignition switch: "ON"
Is diagnostic trouble code No. U1101 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 8.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 8. Check whether the diagnostic trouble code is set again.
Check again if the diagnostic trouble code is set.
(1) Erase the set diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF)
(3) Ignition switch: "ON"
Is diagnostic trouble code No. U1101 set?
Return to Step 3.
This diagnosis is complete.