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-collision 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-collision control.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0125 Lost Communication with Yaw Rate Sensor Module While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the yaw rate sensor and the driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system

  • Yaw rate sensor

  • Driving support ECU assembly
U0126 Lost Communication with Steering Angle Sensor Module While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the steering sensor and the driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system

  • Steering sensor

  • Driving support ECU assembly
U0129 Lost Communication with Brake System Control Module While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the skid control ECU assembly and the driving support ECU assembly is detected for approximately 2.5 seconds or more.

  • CAN communication system

  • Skid control ECU assembly

  • Driving support ECU assembly
U0293 Lost Communication with Hybrid Vehicle Control System While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the hybrid vehicle control ECU assembly and the driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system

  • Hybrid vehicle control ECU assembly

  • Driving support ECU assembly
U1104 Lost Communication with Driving Support ECU While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 0.8 seconds or more.

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

PROCEDURE


  1. CHECK FOR DTCs (RADAR CRUISE)


    1. Clear the DTCs.

      Click here


      Powertrain > Radar Cruise > Clear DTCs

    2. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

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


      1. Turn the power switch on (IG).

      2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF button).

      3. Drive the vehicle at 36 km/h (22 mph) or more for 3 seconds or more.

    3. Check for 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 or U1104 is not output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM Click here