DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:U0122, U0123, U0126, U0293, U1104

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
U0293 Lost Communication with HV ECU
U1104 Lost Communication with Driving Support ECU

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
U0122 While dynamic radar cruise control is operating and power switch is on (IG), communication stop between skid control ECU and driving support ECU assembly continues for 3 second or more

  • Brake booster with master cylinder (skid control ECU)

  • Power management control ECU

  • Driving support ECU assembly

  • CAN communication system
U0123 While dynamic radar cruise control is operating and power switch is on (IG), communication stop between yaw rate sensor and driving support ECU assembly continues for 1 second or more

  • Yaw rate sensor

  • Power management control ECU

  • Driving support ECU assembly

  • CAN communication system
U0126 While dynamic radar cruise control is operating and power switch is on (IG), communication stop between steering angle sensor and driving support ECU assembly continues for 1 second or more

  • Steering angle sensor

  • Power management control ECU

  • Driving support ECU assembly

  • CAN communication system
U0293 While dynamic radar cruise control is operating and power switch is on (IG), communication stop between power management control ECU and driving support ECU assembly or skid control ECU continues for 1 second or more

  • Power management control ECU

  • Driving support ECU assembly

  • Brake booster with master cylinder (skid control ECU)

  • CAN communication system
U1104 While dynamic radar cruise control is either preparing for operation or operating and power switch is on (IG), communication stop between driving support ECU assembly and millimeter wave radar sensor assembly, power management control ECU, or brake booster with master cylinder (skid control ECU) continues for 1 second or more

  • Driving support ECU assembly

  • Millimeter wave radar sensor assembly

  • Power management control ECU

  • Brake booster with master cylinder (skid control ECU)

  • Wire harness or connector (Driving support ECU assembly - millimeter wave radar sensor assembly)

  • CAN communication system

WIRING DIAGRAM

Refer to System Diagram Click here.

Refer to U0235 Click here.

INSPECTION PROCEDURE

Note

When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the front sensor beam axis must be performed Click here.

PROCEDURE


  1. CHECK FOR DTCs


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    5. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    6. Check for DTCs.

      Result
      Result Proceed to
      DTC U1104 is output (for Radar Cruise) A
      DTC U1104 is output (for Hybrid Control) B
      DTCs other than U1104 are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS to check if the CAN communication system is functioning normally Click here.

      Result
      Result Proceed to
      CAN communication is normal A
      CAN communication is malfunctioning B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BODY GROUND)


    1. A0042MKE07
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

      Disconnect the driving support ECU assembly connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      L54-25 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY - BODY GROUND)

    OK

  4. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support control ECU assembly Click here.


    NEXT

  5. CHECK FOR DTCs (DTC U1104)


    1. Connect the GTS to DLC3.

    2. Turn the power switch on (IG).

    3. Clear the DTCs Click here.

    4. Perform the following to make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the malfunction cannot be detected.


      1. Drive the vehicle at a speed for which radar cruise control operation is possible.

      2. Turn the cruise control system on using the cruise control switch (ON-OFF button).

      3. Push the cruise control switch to -/SET to begin control of vehicle speed using the cruise control system.

    5. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.

    6. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC U1104 is output B

    B

    REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY Click here

    A

    END