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DTC C1AA3: Vehicle Speed Sensor Circuit [02/2017 - 08/2020]: Procedure

WARNING: This page is about a different car, the 2020 Toyota C-HR, 2019 Toyota C-HR, and 2018 Toyota C-HR. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (VEHICLE STABILITY CONTROL SYSTEM) 

    HINT: 

    If DTC C1AA3 is stored, the vehicle stability control system may be malfunctioning. Check for DTCs related to the vehicle stability control system first.

    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Trouble Codes.
    5. Check for DTCs.

      Refer to DTC CHECK / CLEAR [02/2017 - ]

      Chassis > ABS/VSC/TRAC/EPB > Trouble Codes 

      Result

      Result Proceed to
      Vehicle stability control system DTCs are not output A
      Vehicle stability control system DTCs are output B

    Result: 

    B 

    GO TO VEHICLE STABILITY CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2017 - ] 

    Result: 

    A 

    See step  2

  2. CHECK DTC OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / LKA/LDA / Trouble Codes.
    5. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2017 - 08/2020]

      Chassis > LKA/LDA > Clear DTCs 

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

      HINT: 

      If the following procedure is not performed, the previously output DTC cannot be detected.

      1. Turn the ignition switch to ON and wait 7 seconds or more.
    7. Check for DTCs.

      Refer to DTC CHECK / CLEAR [02/2017 - 08/2020]

      Chassis > LKA/LDA > Trouble Codes 

      Result

      Result Proceed to
      DTC C1AA3 is output A
      DTC C1AA3 is not output B

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2017 - 10/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 05/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2018 - 09/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 08/2020] 

    Result: 

    A 

    See step  3

  3. REPLACE FORWARD RECOGNITION CAMERA 
    1. Replace the forward recognition camera.

      Refer to REMOVAL [02/2017 - 08/2020]

    2. Adjust the forward recognition camera.

      Refer to ADJUSTMENT (SEQUENTIAL RECOGNITION) [02/2017 - 08/2020]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK DTC OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Chassis / LKA/LDA / Trouble Codes.
    5. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [02/2017 - 08/2020]

      Chassis > LKA/LDA > Clear DTCs 

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

      HINT: 

      If the following procedure is not performed, the previously output DTC cannot be detected.

      1. Turn the ignition switch to ON and wait 7 seconds or more.
    7. Check for DTCs.

      Refer to DTC CHECK / CLEAR [02/2017 - 08/2020]

      Chassis > LKA/LDA > Trouble Codes 

      Result

      Result Proceed to
      DTC C1AA3 is output A
      DTC C1AA3 is not output B

    Result: 

    A 

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [02/2017 - 09/2019]  , or refer to  REMOVAL [09/2019 - 08/2020] 

    Result: 

    B 

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE) 

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