ROAD SIGN ASSIST SYSTEM, Diagnostic DTC:C1AA3

DTC Code DTC Name
C1AA3 Vehicle Speed Sensor Circuit

DESCRIPTION

The forward recognition camera receives vehicle speed signals from the skid control ECU. If the skid control ECU receives a vehicle speed sensor malfunction signal, it informs the forward recognition camera via CAN communication, and DTC C1AA3 is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AA3 Vehicle Speed Sensor Circuit 2 seconds after the ignition switch is turned ON, a signal from the skid control ECU indicating a malfunction in a vehicle speed sensor is detected by the forward recognition camera for 5 seconds or more.

  • Vehicle stability control system

  • Skid control ECU

  • Forward recognition camera

CAUTION / NOTICE / HINT

Note


  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.

  • If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Learning.

    Click here

  • The road sign assist system uses the CAN communication system. First, confirm that there are no malfunction in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

PROCEDURE


  1. CHECK FOR DTCs (VEHICLE STABILITY CONTROL SYSTEM)

    Tech Tips

    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. Check for DTCs.

      except 2TR-FE:

      Click here

      for 2TR-FE:

      Click here

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

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM except 2TR-FE: GO TO VEHICLE STABILITY CONTROL SYSTEM Click here
    GO TO VEHICLE STABILITY CONTROL SYSTEM for 2TR-FE: GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    A

  2. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)


    1. Clear the DTCs.

      Click here

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

      Tech Tips

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

    3. Check for DTCs.

      Click here

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE FORWARD RECOGNITION CAMERA


    1. Replace the forward recognition camera.

      Click here

    2. Perform Forward Recognition Camera Learning.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK FOR DTCs (ROAD SIGN ASSIST SYSTEM)


    1. Clear the DTCs.

      Click here

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

      Tech Tips

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

    3. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC C1AA3 is not output A
      DTC C1AA3 is output (except 2TR-FE) B
      DTC C1AA3 is output (for 2TR-FE) C

    A

    END (FORWARD RECOGNITION CAMERA WAS DEFECTIVE)

    B

    REPLACE SKID CONTROL ECU (MASTER CYLINDER SOLENOID) for LHD: REPLACE SKID CONTROL ECU (MASTER CYLINDER SOLENOID) Click here
    REPLACE SKID CONTROL ECU (MASTER CYLINDER SOLENOID) for RHD: REPLACE SKID CONTROL ECU (MASTER CYLINDER SOLENOID) Click here

    C

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here