PRE-COLLISION SYSTEM, Diagnostic DTC:U0125, U0126, U0129, U0142, 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
U0142 Lost Communication with Body Control Module "B"
U0293 Lost Communication with Hybrid Control Module
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 When the power switch is on (IG), a communication error between the airbag sensor assembly (yaw rate sensor) and the driving support ECU assembly is detected for approximately 0.736 seconds.

  • CAN communication system

  • Airbag sensor assembly (yaw rate sensor)

  • Driving support ECU assembly
U0126 Lost Communication with Steering Angle Sensor Module When the power switch is on (IG), a communication error between the spiral cable with sensor sub-assembly (steering angle sensor) and the driving support ECU assembly is detected for approximately 0.736 seconds.

  • CAN communication system

  • Spiral cable with sensor sub-assembly (steering angle sensor)

  • Driving support ECU assembly
U0129 Lost Communication with Brake System Control Module When the power switch is on (IG), a communication error between the skid control ECU (brake booster with master cylinder assembly) and the driving support ECU assembly is detected for approximately 2.24 seconds.

  • CAN communication system

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

  • Driving support ECU assembly
U0142 Lost Communication with Body Control Module "B" When the power switch is on (IG), a communication error between the main body ECU (multiplex network body ECU) and driving support ECU assembly is detected for approximately 11.2 seconds.

  • CAN communication system

  • Main body ECU (multiplex network body ECU)

  • Driving support ECU assembly
U0293 Lost Communication with Hybrid Control Module When the power switch is on (IG), a communication error between power management control ECU and driving support ECU assembly or skid control ECU (brake booster with master cylinder assembly) is detected for approximately 0.76 seconds.

  • CAN communication system

  • Power management control ECU

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

  • Driving support ECU assembly
U1104 Lost Communication with Driving Support ECU When the power switch is on (IG), a communication error between power management control ECU and driving support ECU assembly or skid control ECU (brake booster with master cylinder assembly) is detected for approximately 0.76 seconds.

  • CAN communication system

  • Power management control ECU

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

  • Driving support ECU assembly

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC (PRE-COLLISION 2)


    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.

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

      Tech Tips

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

    6. Check for DTCs.

      Result
      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

    USE SIMULATION METHOD TO CHECK Click here