PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U0122, U0123, U0126, U0140, U0151, U1100

DTC Code DTC Name
U0122 Lost Communication with Vehicle Dynamics Control Module
U0123 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication with Steering Angle Sensor Module
U0140 Lost Communication with Main Body ECU
U0151 Lost Communication with Airbag ECU
U1100 Lost Communication with Seat Belt Control ECU

DESCRIPTION

The driving support ECU uses the millimeter wave radar sensor to detect obstacles in front of the vehicle.

Based on this information, the driving support ECU sends pre-crash control operation signals.

These DTCs are stored when a communication malfunction occurs between the sensors and ECUs that detect collisions, or between ECUs that perform the pre-crash control.

DTC No. DTC Detection Condition Trouble Area
U0122 When the engine switch is on (IG), a communication error between the skid control ECU and the driving support ECU is detected for approx. 1 second.

  • Skid control ECU

  • CAN communication system

  • Seat belt control ECU

  • Driving support ECU
U0123 When the engine switch is on (IG), a communication error between the yaw rate sensor and the driving support ECU is detected for approx. 1 second.

  • Yaw rate sensor

  • CAN communication system

  • Driving support ECU
U0126 When the engine switch is on (IG), a communication error between the steering sensor and the driving support ECU is detected for approx. 1 second.

  • Steering angle sensor

  • CAN communication system

  • Driving support ECU
U0140 While engine switch is on (IG), communication stop between main body ECU and seat belt control ECU continues for 1 second or more.

  • Main body ECU

  • CAN communication system

  • Seat belt control ECU
U0151 While engine switch is on (IG), communication stop between center airbag sensor and seat belt control ECU continues for 1 second or more.

  • Center airbag sensor

  • CAN communication system

  • Seat belt control ECU
U1100 When the engine switch is on (IG), a communication error between the seat belt control ECU and the driving support ECU is detected for approx. 1 second.

  • Seat belt control ECU

  • CAN communication system

  • Driving support ECU

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Select "CAN Bus Check" from the "System Selection Menu" screen on the intelligent tester.

    2. Select "Communication Malfunction DTC" from the "CAN Bus Check" screen, and then select "Enter".

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here