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 output when a communication malfunction occurs between the sensors and ECUs.

DTC Code 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 from brake booster with master cylinder (skid control ECU) to driving support ECU continues for 1 second or more

  • Brake booster with master cylinder (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 from yaw rate sensor to 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 from steering angle sensor to 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 from power management control ECU to driving support ECU or brake booster with master cylinder (skid control ECU) continues for 1 second or more

  • Power management control ECU

  • CAN communication system

  • Driving support ECU

  • 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 from driving support ECU to 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

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Power management control ECU

  • Brake booster with master cylinder (skid control ECU)

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 intelligent tester on.

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

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC U1104 is output A
      DTCs other than U1104 are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK CAN COMMUNICATION SYSTEM


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

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

      OK
      Communication system is normal.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

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


    1. A01J93RE26
      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
      L60-25 (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

  4. REPLACE DRIVING SUPPORT ECU


    1. Replace the driving support control ECU Click here.


    NEXT

  5. CHECK WHETHER DTC OUTPUT RECURS


    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