DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:U0100, U0122, U0123, U0126, U1104

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0122 Lost Communication with Vehicle Dynamics Control Module
U0123 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
U1104 Lost Communication with Driving Support ECU

DESCRIPTION

The ECM communicates several signals with each sensor and ECU via CAN communication.

If there are any malfunctions in the communication circuit, one or more CAN communication system DTCs are stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0100 Lost Communication with ECM / PCM "A"

(Condition 1)


  • While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a communication cut-off signal from the driving support ECU assembly for more than a certain amount of time, the ECM stores this DTC.

(Condition 2)


  • While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a communication cut-off signal from the skid control ECU (brake actuator assembly) for a certain amount of time, the ECM stores this DTC.

(Condition 1)


  • Communication circuit

  • ECM

  • Driving support ECU assembly

(Condition 2)


  • Communication circuit

  • ECM

  • Skid control ECU (brake actuator assembly)
U0122 Lost Communication with Vehicle Dynamics Control Module While dynamic radar cruise control is either preparing for operation or operating, communication data from the skid control ECU (brake actuator assembly) is invalid for a certain amount of time, the ECM stores this DTC.

  • Communication circuit

  • Skid control ECU (brake actuator assembly)

  • ECM
U0123 Lost Communication with Yaw Rate Sensor Module While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a yaw rate sensor malfunction signal for a certain amount of time.

  • Communication circuit

  • Airbag senor assembly (yaw rate sensor)

  • Driving support ECU assembly

  • ECM
U0126 Lost Communication with Steering Angle Sensor Module While the dynamic radar cruise control is either preparing for operation or operating, the ECM continuously receives a steering sensor communication error signal for a certain amount of time, the driving support ECU assembly sends a signal to the ECM and the ECM stores this DTC.

  • Communication circuit

  • Steering angle sensor

  • Driving support ECU assembly

  • ECM
U1104 Lost Communication with Driving Support ECU While dynamic radar cruise control is either preparing for operation or operating and engine switch is on (IG), communication between driving support ECU assembly and front millimeter wave radar sensor assembly, ECM or skid control ECU (brake actuator assembly) stops for 1 second or more.

  • Driving support ECU assembly

  • Communication circuit

  • Millimeter wave radar sensor assembly

  • ECM

  • Skid control ECU (brake actuator assembly)

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

      Click here

      Result
      Result Proceed to
      CAN communication is normal A
      CAN communication is malfunctioning B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM Click here