LANE DEPARTURE ALERT SYSTEM, Diagnostic DTC:C1AA3

DTC Code DTC Name
C1AA3 Vehicle Speed Sensor Circuit

DESCRIPTION

The pre-crash safety city sensor receives vehicle speed signals from the brake actuator assembly (skid control ECU). When the brake actuator assembly (skid control ECU) detects a malfunction in the vehicle wheel speed sensor, the pre-crash safety city sensor is notified via CAN communication and DTC C1AA3 is output.

DTC Code DTC Detection Condition Trouble Area
C1AA3 While the system is operating, a vehicle wheel speed sensor malfunction signal is continuously received for 5 seconds or more from the brake actuator assembly (skid control ECU)

  • Vehicle stability control system

  • Brake actuator assembly (skid control ECU)

  • Pre-crash safety city sensor

CAUTION / NOTICE / HINT

Note


  • When replacing the pre-crash safety city sensor, replace it with a new one and be sure to initialize the settings. If an ECU which was installed to another vehicle is used, the information stored in the pre-crash safety city sensor will not match the information from the vehicle and, as a result, a DTC may be output.

  • When the pre-crash safety city sensor is replaced with a new one or it is removed, camera beam axis learning must be performed.

  • Since CAN communication is used, first perform the communication function check in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting.

PROCEDURE


  1. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      Vehicle stability control system DTC is not output A
      Vehicle stability control system DTC is output B

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here

    A

  2. CHECK FOR DTC


    1. Clear the DTCs Click here.

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

      Tech Tips

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

    3. Check for DTCs Click here.

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE PRE-CRASH SAFETY CITY SENSOR


    1. Replace the pre-crash safety city sensor with a new one Click here.


    NEXT

  4. CHECK FOR DTC


    1. Clear the DTCs Click here.

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

      Tech Tips

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

    3. Check for DTCs Click here.

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

    A

    END (PRE-CRASH SAFETY CITY SENSOR WAS DEFECTIVE)

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here