DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:U0100, U0122, U0125, U0126, U0129, U1104

DTC Code DTC Name
U0100 Lost Communication with ECM / PCM "A"
U0122 Lost Communication With Vehicle Dynamics Control Module
U0125 Lost Communication with Yaw Rate Sensor Module
U0126 Lost Communication With Steering Angle Sensor Module
U0129 Lost Communication with Brake System Control Module
U1104 Lost Communication with Driving Support ECU

DESCRIPTION

The ECM and driving support ECU assembly communicate signals with each sensor and ECU via CAN communication.

If there are any malfunctions in the communication circuit, one or more CAN communication system DTCs are output.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0100 Lost Communication with ECM / PCM "A"

    Condition 1:

  • While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the ECM and the driving support ECU assembly is detected for approximately 1 second or more.


    Condition 2:

  • While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, the ECM continuously receives a communication cut-off signal from the skid control ECU for approximately 1 second or more.

    Condition 1:

  • CAN communication system

  • ECM

  • Driving support ECU assembly


    Condition 2:

  • CAN communication system

  • ECM

  • Skid control ECU (brake actuator assembly)*1

  • Skid control ECU (master cylinder solenoid)*2
U0122 Lost Communication with Vehicle Dynamics Control Module When the ignition switch to ON and the dynamic radar cruise control system is operating, a communication error between the skid control ECU and the ECM is detected for approximately 2.6 seconds or more.

  • CAN communication system

  • Skid control ECU (brake actuator assembly)*1

  • Skid control ECU (master cylinder solenoid)*2

  • ECM
U0125 Lost Communication with Yaw Rate Sensor Module While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the yaw rate sensor and the driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system

  • Yaw rate sensor (airbag sensor assembly)

  • Driving support ECU assembly
U0126 Lost Communication With Steering Angle Sensor Module While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the steering sensor and the driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system

  • Steering sensor

  • Driving support ECU assembly
U0129 Lost Communication with Brake System Control Module While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the skid control ECU and the driving support ECU assembly is detected for approximately 1 second or more.

  • CAN communication system

  • Skid control ECU (brake actuator assembly)*1

  • Skid control ECU (master cylinder solenoid)*2

  • Driving support ECU assembly
U1104 Lost Communication with Driving Support ECU

    Condition 1:

  • While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the driving support ECU assembly and ECM is detected for 1 second or more.


    Condition 2:

  • While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the millimeter wave radar sensor assembly and driving support ECU assembly is detected for 0.2 seconds or more.

    Condition 1:

  • CAN communication system

  • ECM

  • Driving support ECU assembly


    Condition 2:

  • CAN communication system

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly

*1: for Vacuum brake booster

*2: for Hydraulic brake booster

CAUTION / NOTICE / HINT

Tech Tips

Refer to troubleshooting in CAN Communication System.

Click here

PROCEDURE


  1. CHECK FOR DTCs


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Clear the DTCs.

      Click here

    4. Make sure that the DTC detection conditions are met.

      Tech Tips

      If the detection conditions are not met, the system cannot detect the malfunction.

    5. Check the DTCs.

      Click here

      Result
      Result Proceed to
      DTC U0100, U0122, U0125, U0126, U0129 and U1104 are not output A
      DTC U0100, U0122, U0125, U0126, U0129 or U1104 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM Click here