PRE-COLLISION SYSTEM, Diagnostic DTC:U0100, U0125, U0126, U0129, U0155

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0125 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
U0129 Lost Communication with Brake System Control Module
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module

DESCRIPTION

The driving support ECU assembly uses the millimeter wave radar sensor assembly to detect objects in front of the vehicle. Based on signals from the millimeter wave radar sensor assembly, the driving support ECU assembly sends pre-collision system control operation signals. These DTCs are stored when a communication malfunction occurs between ECUs that perform pre-collision system control.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0100 Lost Communication with ECM / PCM "A" When the vehicle is being driven at a speed of 5 km/h (4 mph) or more, a communication error between the ECM and the driving support ECU assembly is detected for approximately 5 seconds.

  • CAN communication system

  • ECM

  • Driving support ECU assembly
U0125 Lost Communication with Yaw Rate Sensor Module When the engine switch is on (IG), a communication error between the yaw rate sensor and the driving support ECU 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 When the engine switch is on (IG), a communication error between the steering sensor and the driving support ECU assembly is detected for approximately 4 seconds or more.

  • CAN communication system

  • Steering sensor

  • Driving support ECU assembly
U0129 Lost Communication with Brake System Control Module When the engine switch is on (IG), a communication error between the skid control ECU (brake actuator assembly) and the driving support ECU assembly is detected for approximately 3 seconds or more.

  • CAN communication system

  • Skid control ECU (brake actuator assembly)

  • Driving support ECU assembly
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module When the engine switch is on (IG), a communication error between the combination meter assembly and the driving support ECU assembly is detected for approximately 3 seconds or more.

  • CAN communication system

  • Combination meter assembly

  • Driving support ECU assembly

PROCEDURE


  1. CHECK FOR DTCs (PRE-COLLISION SYSTEM)


    1. Clear the DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > 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 for DTCs.

      Click here


      Body Electrical > Pre-Collision 2 > Trouble Codes
      Result
      Result Proceed to
      DTC U0100, U0125, U0126, U0129 and U0155 are not output A
      DTC U0100, U0125, U0126, U0129 or U0155 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM Click here