ROAD SIGN ASSIST SYSTEM, Diagnostic DTC:U0100,U0101,U0123,U0129,U0142 and U0155

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0101 Lost Communication with TCM
U0123 Lost Communication with Yaw Rate Sensor Module
U0129 Lost Communication with Brake System Control Module
U0142 Lost Communication with Body Control Module "B"
U0155 Lost Communication with Combination Meter

DESCRIPTION

These DTCs are stored when a communication error occurs between the sensors and ECUs.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0100

Lost Communication with ECM / PCM "A"

While the vehicle is being driven at 1 km/h (1 mph) or more, a communication error between the ECM and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • ECM

  • Forward recognition camera

U0101

Lost Communication with TCM

While the vehicle is being driven at 1 km/h (1 mph) or more, a communication error between the ECM (TCM) and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • ECM (TCM)

  • Forward recognition camera

U0123

Lost Communication with Yaw Rate Sensor Module

While the vehicle is being driven at 1 km/h (1 mph) or more, a communication error between the yaw rate sensor and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • Yaw rate and acceleration sensor (airbag sensor assembly)

  • Forward recognition camera

U0129

Lost Communication with Brake System Control Module

While the ignition switch is ON, a communication error between the skid control ECU and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • Skid control ECU (Brake actuator assembly)

  • Forward recognition camera

U0142

Lost Communication with Body Control Module "B"

While the ignition switch is ON, a communication error between the main body ECU (multiplex network body ECU) and the forward recognition camera is detected for approximately 5 seconds or more.

  • CAN communication system

  • Main body ECU (Multiplex network body ECU)

  • Forward recognition camera

U0155

Lost Communication with Combination Meter

While the ignition switch is ON, a communication error between the combination meter assembly and the forward recognition camera is detected for approximately 50 seconds or more.

  • CAN communication system

  • Combination meter assembly

  • Forward recognition camera

PROCEDURE

  1. READ VALUE USING GTS (CAN BUS CHECK)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: System Select / Can Bus Check.

      CAN Bus Check

    Result

    Result

    Proceed to

    All of the ECUs and sensors that are currently connected to the CAN communication system are displayed

    A

    None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed

    B
    B

    GO TO CAN COMMUNICATION SYSTEM

    for LHD with Central Gateway ECU:Click here

    for RHD with Central Gateway ECU:Click here

    A

  2. CLEAR DTCs (ROAD SIGN ASSIST SYSTEM)

    1. Clear the DTCs.

      Click here

      Body Electrical > Road Sign Assist > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  3. CHECK CAN COMMUNICATION SYSTEM

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Enter the following menus: System Select / Can Bus Check / Enter.

      OK

      The CAN communication system is normal.

    Result

    Proceed to

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick here

    NG

    GO TO DTC CHART (CAN COMMUNICATION SYSTEM)

    for LHD with Central Gateway ECU:Click hereClick here

    for RHD with Central Gateway ECU:Click hereClick here