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 continues for 1 second or more

  • Skid control ECU

  • CAN communication system

  • Driving support ECU
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 continues for 1 second or more

  • Yaw rate sensor

  • CAN communication system

  • Driving support ECU
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 continues for 1 second or more

  • Steering angle sensor

  • CAN communication system

  • Driving support ECU
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 or skid control ECU continues for 1 second or more

  • Power management control ECU

  • CAN communication system

  • Driving support ECU

  • 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 and millimeter wave radar sensor assembly, power management control ECU, or skid control ECU continues for 1 second or more

  • Driving support ECU

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Power management control ECU

  • Skid control ECU

WIRING DIAGRAM

Refer to System Diagram Click here.

Refer to U0235 Click here.

INSPECTION PROCEDURE

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 - MILLIMETER WAVE RADAR SENSOR ASSEMBLY)


    1. A01NDUDE07
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Millimeter Wave Radar Sensor Assembly)
      *2

      Front view of wire harness connector

      (to Driving Support ECU)

      Disconnect the driving support ECU and millimeter wave radar sensor assembly connectors.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C1-38 (LRRD) - B1-4 (LRDD) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C1-38 (LRRD) or B1-4 (LRDD) - Body ground Always 10 kΩ or higher

    3. Reconnect the driving support ECU and millimeter wave radar sensor assembly connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

    OK

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


    1. A01NCOKE14
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Driving Support ECU)

      Disconnect the driving support ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C1-25 (GND) - Body ground Always Below 1 Ω

    3. Reconnect the driving support ECU connector.


    NG

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

    OK

  5. REPLACE DRIVING SUPPORT ECU


    1. Replace the driving support control ECU Click here.


    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC U1104)


    1. Connect the intelligent tester to the 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 40 km/h (25 mph) or more.

      2. Turn the cruise control main switch 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