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 either preparing for operation or operating and power switch is on (IG), communication stop between skid control ECU and driving support ECU assembly continues for 6 second or more

  • Brake booster with master cylinder (skid control ECU)

  • CAN communication system

  • Driving support ECU assembly
U0123 While dynamic radar cruise control is either preparing for operation or 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

  • CAN communication system

  • Driving support ECU assembly
U0126 While dynamic radar cruise control is either preparing for operation or operating and power switch is on (IG), communication stop between steering angle sensor and driving support ECU assembly continues for 4 second or more

  • Steering angle sensor

  • CAN communication system

  • Driving support ECU assembly
U0293 While dynamic radar cruise control is either preparing for operation or 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 4 second or more

  • Power management control ECU

  • CAN communication system

  • Driving support ECU assembly

  • Brake booster with master cylinder (skid control ECU)
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

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Power management control ECU

  • Brake booster with master cylinder (skid control ECU)

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 radar sensor beam axis must be performed Click here.

PROCEDURE


  1. READ OUTPUT DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Radar Cruise / DTC.

    5. Enter the following menus: Powertrain / Hybrid Control / DTC.

    6. Read the 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 intelligent tester 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 POWER SOURCE)


    1. A003VNUE57
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Driving Support ECU Assembly)

      Disconnect the driving support ECU assembly connector.

    2. Turn the power switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H5-30 (B) - Body ground Power switch on (IG) 11 to 14 V

    4. Reconnect the driving support ECU assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A003VNUE55
      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
      H5-25 (GND) - Body ground Always Below 1 Ω

    3. Reconnect the driving support ECU assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE DRIVING SUPPORT ECU ASSEMBLY


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


    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC U1104)


    1. Connect the intelligent tester 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 of 50 km/h (30 mph) and 170 km/h (105 mph).

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

      3. Push the -/SET switch to activate the cruise control.

    5. Enter the following menus: Powertrain / Radar Cruise / DTC.

    6. Read the 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