DYNAMIC RADAR CRUISE CONTROL SYSTEM, Diagnostic DTC:U0100, U0122, U0125, U0126, U0129, U0235, 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
U0235 Lost Communication with Cruise Control Front Distance Range Sensor
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 0.92 seconds 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 (brake actuator assembly) for approximately 0.15 seconds or more.

    Condition 1:

  • CAN communication system

  • ECM

  • Driving support ECU assembly

  • Network Gateway ECU


    Condition 2:

  • CAN communication system

  • ECM

  • Skid control ECU (brake actuator assembly)
U0122 Lost Communication with Vehicle Dynamics Control Module When the ignition switch is turned ON and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (brake actuator assembly) and the ECM is detected for approximately 2.72 seconds or more.

  • CAN communication system

  • Skid control ECU (brake actuator assembly)

  • 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 0.72 seconds 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 angle sensor and the driving support ECU assembly is detected for approximately 5.04 seconds or more.

  • CAN communication system

  • Steering angle 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 (brake actuator assembly) and the driving support ECU assembly is detected for approximately 2 seconds or more.

  • CAN communication system

  • Skid control ECU (brake actuator assembly)

  • Driving support ECU assembly
U0235 Lost Communication with Cruise Control Front Distance Range Sensor 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 the driving support ECU assembly is detected for approximately 1.6 seconds or more.

  • CAN communication system

  • Millimeter wave radar sensor circuit

  • Millimeter wave radar sensor assembly

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

    Condition 1:

  • While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 0.92 seconds or more.


    Condition 2:

  • While the vehicle speed is 5 km/h (3 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 0.144 seconds or more.

    Condition 1:

  • Millimeter wave radar sensor assembly

  • Driving support ECU assembly


    Condition 2:

  • CAN communication system

  • ECM

  • Driving support ECU assembly

  • Network Gateway ECU

CAUTION / NOTICE / HINT

Tech Tips

Refer to troubleshooting in CAN Communication System.

for LHD with Central Gateway ECU: Click here

for RHD with Central Gateway ECU: 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


      1. for 2AD-FHV, 2AD-FTV:


        Powertrain > Radar Cruise1 > Clear DTCs
        Powertrain > Radar Cruise2 > Clear DTCs

      2. for 2AR-FE, 3ZR-FE, 3ZR-FAE:


        Powertrain > Radar Cruise1 > Clear DTCs
        Powertrain > Radar Cruise2 > Clear DTCs

      3. for 2WW:


        Powertrain > Cruise Control > Clear DTCs
        Powertrain > Radar Cruise2 > Clear DTCs

    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.


      1. Turn the ignition switch to ON.

      2. Turn the dynamic radar cruise control system on using the cruise control switch (ON/OFF).

      3. Drive the vehicle at 5 km/h (3 mph) or more for 5 seconds or more.

    5. Enter the following menus: Powertrain / Radar Cruise2 / Trouble Codes.

    6. Check the DTCs.

      Click here


      1. for 2AD-FHV, 2AD-FTV:


        Powertrain > Radar Cruise1 > Trouble Codes
        Powertrain > Radar Cruise2 > Trouble Codes

      2. for 2AR-FE, 3ZR-FE, 3ZR-FAE:


        Powertrain > Radar Cruise1 > Trouble Codes
        Powertrain > Radar Cruise2 > Trouble Codes

      3. for 2WW:


        Powertrain > Cruise Control > Trouble Codes
        Powertrain > Radar Cruise2 > Trouble Codes
      Result
      Result Proceed to
      DTC U0100, U0122, U0125, U0126, U0129, U0235 and U1104 are not output A
      DTC U0100, U0122, U0125, U0126, U0129, U0235 or U1104 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    GO TO CAN COMMUNICATION SYSTEM for LHD with Central Gateway ECU: Click here
    GO TO CAN COMMUNICATION SYSTEM for RHD with Central Gateway ECU: Click here