DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:U0125, U0126, U0129, U0293, U1104

DTC Code DTC Name
U0125 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
U0129 Lost Communication with Brake System Control Module
U0293 Lost Communication with Hybrid Vehicle Control System
U1104 Lost Communication with Driving Support ECU

DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle. Based on this information, the driving support ECU assembly sends pre-Crash safety control operation signals. These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect crashes, or between ECUs that perform the pre-Crash safety control.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0125 Lost Communication with Yaw Rate Sensor Module At a vehicle speed of 36 km/h or more, the driving support ECU assembly does not receive data from the airbag ECU assembly for 0.772 seconds or more.

  • CAN communication system

  • Airbag ECU assembly

  • Driving support ECU assembly
U0126 Lost Communication with Steering Angle Sensor Module At a vehicle speed of 36 km/h or more, the driving support ECU assembly does not receive data from the spiral cable with sensor sub-assembly for 3.76 seconds or more.

  • CAN communication system

  • Spiral cable with sensor sub-assembly

  • Driving support ECU assembly
U0129 Lost Communication with Brake System Control Module At a vehicle speed of 36 km/h or more, the driving support ECU assembly does not receive data from the skid control ECU (brake booster with master cylinder assembly) for 5.24 seconds or more.

  • CAN communication system

  • Skid control ECU (brake booster with master cylinder assembly)

  • Driving support ECU assembly
U0293 Lost Communication with Hybrid Vehicle Control System At a vehicle speed of 36 km/h or more, the driving support ECU assembly does not receive data from the EV control ECU for 3.808 seconds or more.

  • CAN communication system

  • EV control ECU

  • Driving support ECU assembly
U1104 Lost Communication with Driving Support ECU At a vehicle speed of 36 km/h or more, the brake booster assembly (w/ master cylinder) (skid control ECU) or the EV control ECU do not receive data from the driving support ECU for 1.192 seconds or more.

  • CAN communication system

  • EV control ECU

  • Driving support ECU assembly

  • Skid control ECU (brake booster with master cylinder assembly)

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise > Clear DTCs

    2. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    3. Check the DTCs.

      Click here


      Powertrain > Radar Cruise > Trouble Codes
      Result
      Result Proceed to
      DTC U0125, U0126, U0129, U0293 and U1104 are not output A
      DTC U0125, U0126, U0129, U0293 and U1104 is output (for LHD) B
      DTC U0125, U0126, U0129, U0293 and U1104 is output (for RHD) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here