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DTC U0100: Engine time-out error
DTC U0101: CVT time-out error
DTC U0114: AWD time-out error
DTC U0126: Steering wheel sensor time-out error
DTC U0141: ETACS time-out error
DTC U15A5: FCM/LDW/AHB CAN timeout
 
 
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 Line Diagnostic Flow ).
  • If diagnostic trouble codes U0100, U0101, U0114, U0126, U0141 and U15A5 are 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.
  • Before replacing the ECU, ensure that the communication circuit is normal.
  • When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to ).
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to , and ).
 
 
CIRCUIT OPERATION
ASC-ECU communicates with the engine control module, TCM, AWD-ECU, the steering wheel sensor, and ETACS-ECU via the CAN bus lines.
 
 
 
DTC SET CONDITIONS
This diagnostic trouble code is set if ASC-ECU cannot receive the signal sent from other ECU for a certain period.
 
 
 
PROBABLE CAUSES
DTC U0100
  • Wiring harness or connector failure of CAN bus line
  • Engine control module malfunction
  • ASC-ECU malfunction
  • Connector disconnected or improperly connected
  • Stretched or broken wires
DTC U0101
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of TCM
  • ASC-ECU malfunction
  • Connector disconnected or improperly connected
  • Stretched or broken wires
DTC U0114
  • Wiring harness or connector failure of CAN bus line
  • AWD-ECU malfunction
  • ASC-ECU malfunction
  • Connector disconnected or improperly connected
  • Stretched or broken wires
DTC U0126
  • Wiring harness or connector failure of CAN bus line
  • Steering wheel sensor malfunction
  • ASC-ECU malfunction
  • Connector disconnected or improperly connected
  • Stretched or broken wires
DTC U0141
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of ETACS-ECU
  • ASC-ECU malfunction
  • Connector disconnected or improperly connected
  • Stretched or broken wires
DTC U15A5
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of FCM/LDW/AHB-ECU
  • ASC-ECU malfunction
  • Connector disconnected or improperly connected
  • Stretched or broken wires
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
Use scan tool MB991958 to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 3.
 
STEP 2. Check whether the DTC is set again.
Is DTC U0100, U0101, U0114, U0126, U0141 or U15A5 set?
Go to Step 3.
The procedure is complete.
 
STEP 3. Connector check: ASC-ECU connector
Is the check result normal?
Go to Step 4.
Repair the defective connector. Then go to Step 4.
 
STEP 4. M.U.T.-III other system DTC
Use scan tool to check that other diagnostic trouble code is set in the ECU corresponding to the relevant diagnosis.
Is other DTC set?
Troubleshoot for the relevant diagnostic trouble code.
Go to Step 5.
 
STEP 5. ETACS-ECU coding data check
Refer to GROUP 00 - Precautions before Service/Coding List .
Is the check result normal?
Go to Step 6.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ), and then go to Step 6.
 
STEP 6. Check whether the DTC is set again.
Erase the DTCs.
Is DTC U0100, U0101, U0114, U0126, U0141 or U15A5 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
The procedure is complete.