PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U0100, U0122, U0123, U0126, U0140, U0151, U0235, U1104, U1118, U1121, U1124, U1125

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
U0140 Lost Communication with Main Body ECU
U0151 Lost Communication with Airbag ECU
U0235 Lost Communication with Cruise Control Front Distance Range Sensor
U1104 Lost Communication with Driving Support ECU
U1118 Lost Communication with Rear Radar Sensor
U1121 Lost Communication with Driver Monitor ECU
U1124 Lost Communication with Right Headrest Control ECU
U1125 Lost Communication with Left Headrest Control ECU

DESCRIPTION

The driving support ECU uses the front millimeter wave radar sensor, driver monitor camera and object recognition camera sensor to detect obstacles in front of and behind the vehicle, and detect the direction that the driver's head is facing. Based on this information, the driving support ECU sends pre-crash control operation signals.

This DTC is output when a communication malfunction occurs between the sensors and ECUs that detect collisions, or between ECUs that perform the pre-crash control.

DTC Code DTC Detection Condition Trouble Area
U0100 While vehicle speed is 5 km/h (3 mph) or more, communication stop between ECM and driving support ECU continues for 1 second or more

  • ECM

  • CAN communication system

  • Driving support ECU
U0122 While engine switch is on (IG), communication stop between skid control ECU and driving support ECU or seat belt control ECU continues for 1 second or more

  • Skid control ECU

  • CAN communication system

  • Seat belt control ECU

  • Driving support ECU
U0123 While engine switch is on (IG), communication stop between yaw rate sensor and driving support ECU continues for 1 second or more

  • Yaw rate sensor

  • CAN communication system

  • Driving support ECU
U0126 While engine switch is on (IG), communication stop between steering angle sensor and driving support ECU continues for 1 second or more

  • Steering angle sensor

  • CAN communication system

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

  • Main body ECU

  • CAN communication system

  • Seat belt control ECU

  • Driving support 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
U0235 While engine switch is on (IG), communication stop between front millimeter wave radar sensor and driving support ECU continues for 1 second or more

  • Front millimeter wave radar sensor

  • CAN communication system

  • Driving support ECU
U1104 While engine switch is on (IG), communication stop between driving support ECU and front millimeter wave radar sensor, object recognition ECU, ECM, rear millimeter wave radar sensor or seat belt control ECU continues for 1 second or more

  • Driving support ECU

  • CAN communication system

  • Front millimeter wave radar sensor

  • Object recognition ECU

  • Rear millimeter wave radar sensor

  • Seat belt control ECU
U1118 While engine switch is on (IG), communication stop between rear millimeter wave radar sensor and driving support ECU continues for 1 second or more

  • Rear millimeter wave radar sensor

  • CAN communication system

  • Driving support ECU
U1121 While engine switch is on (IG), communication stop between driver monitor ECU and driving support ECU continues for 1 second or more

  • Driver monitor ECU

  • CAN communication system

  • Driving support ECU
U1124 While engine switch is on (IG), communication stop between front active headrest ECU RH and driving support ECU continues for 1 second or more

  • Front active headrest ECU RH

  • CAN communication system

  • Driving support ECU
U1125 While engine switch is on (IG), communication stop between front active headrest ECU LH and driving support ECU continues for 1 second or more

  • Front active headrest ECU LH

  • CAN communication system

  • Driving support ECU

INSPECTION PROCEDURE

Refer to CAN communication system (U0100, Click here.

Refer to CAN communication system (U0122, U0140, U0151, Click here.

Refer to CAN communication system (U0123, Click here.

Refer to CAN communication system (U0126, Click here.

Refer to CAN communication system (U0235, Click here.

Refer to CAN communication system (U1104, Click here.

Refer to CAN communication system (U1118, Click here.

Refer to CAN communication system (U1121, Click here.

Refer to CAN communication system (U1124, Click here.

Refer to CAN communication system (U1125, Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

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

      Result
      Result Proceed to
      CAN communication system DTC is not output A
      CAN communication system DTC is output (for LHD) B
      CAN communication system DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM (for LHD) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (for RHD) Click here

    A

    USE SIMULATION METHOD TO CHECK Click here