PRE-COLLISION SYSTEM, Diagnostic DTC:C1AA3

DTC Code DTC Name
C1AA3 Vehicle Speed Sensor Circuit

DESCRIPTION

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

DTC No.

DTC Detection Condition

Trouble Area

C1AA3

Both of the following conditions are met:

  1. All of the following conditions are met:

    • 3 seconds have elapsed since the ignition switch ON.

    • The battery voltage is 10 V or more for 3 seconds or more.

  3. All of the following conditions are met for 1 second or more:

    • Communication between the pre-collision city sensor and skid control ECU (brake actuator assembly) is normal.

    • The pre-collision city sensor receives a wheel speed sensor malfunction signal from the skid control ECU (brake actuator assembly).

  • Vehicle stability control system

  • Skid control ECU (Brake actuator assembly)

  • Pre-collision city sensor

CAUTION / NOTICE / HINT

Note:

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

  • If the pre-collision city sensor has been replaced, or the windshield glass has been replaced or removed/installed, be sure to perform Pre-collision City Sensor Learning (Click here).

  • First check the CAN communication system by following How to Proceed with Troubleshooting. After checking that there are no malfunctions in the CAN communication system, proceed with troubleshooting (Click here).

PROCEDURE

  1. CHECK FOR DTCS (VEHICLE STABILITY CONTROL SYSTEM)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.

    5. Check for DTCs (Click here).

    Table 1. Result

    Result

    Proceed to

    Vehicle stability control system DTCs are not output

    A

    Vehicle stability control system DTCs are output

    B

    GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

    (Click here)

  2. CHECK FOR DTCS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / PCS/LDA/RSA/LVN / Trouble Codes.

    5. Clear the DTCs (Click here).

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

      Tip:

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

    7. Check for DTCs (Click here).

    Table 2. Result

    Result

    Proceed to

    DTC C1AA3 is not output

    A

    DTC C1AA3 is output

    B

    USE SIMULATION METHOD TO CHECK

    (Click here)

  3. REPLACE PRE-COLLISION CITY SENSOR

    1. Replace the pre-collision city sensor (Click hereClick here).

    2. Perform Pre-collision City Sensor Learning (Click here).

  4. CHECK FOR DTCS

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Chassis / PCS/LDA/RSA/LVN / Trouble Codes.

    5. Clear the DTCs (Click here).

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

      Tip:

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

    7. Check for DTCs (Click here).

    Table 3. Result

    Result

    Proceed to

    DTC C1AA3 is not output

    A

    DTC C1AA3 is output

    B

    END (PRE-COLLISION CITY SENSOR WAS DEFECTIVE)

    GO TO SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

    (Click here)