PRE-COLLISION SYSTEM, Diagnostic DTC:C1AA4, C1AA5

DTC Code DTC Name
C1AA4 Yaw Rate Sensor Circuit
C1AA5 Yaw Rate Sensor Power Supply Voltage Circuit

DESCRIPTION

The pre-collision city sensor receives vehicle stability signals from the yaw rate sensor. When the pre-collision city sensor detects a malfunction in the yaw rate sensor, a DTC is stored.

DTC No. DTC Detection Condition Trouble Area
C1AA4

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.

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


    • The vehicle is being driven at 5 km/h (4 mph) or more.

    • Communication between the pre-collision city sensor and yaw rate sensor is normal.

    • The pre-collision city sensor receives a yaw rate sensor malfunction signal from the yaw rate sensor.

  • Vehicle stability control system

  • Yaw rate sensor

  • Pre-collision city sensor
C1AA5

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.

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


    • The vehicle is being driven at 5 km/h (4 mph) or more.

    • Communication between the pre-collision city sensor and yaw rate sensor is normal.

    • The pre-collision city sensor receives a yaw rate sensor power source malfunction signal from the yaw rate sensor.

  • Vehicle stability control system

  • Yaw rate sensor

  • 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.

      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 (DIAGNOSTIC TROUBLE CODE CHART) Click here

    A

  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.

      Tech Tips

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

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1AA4 and C1AA5 are not output A
      DTC C1AA4 or C1AA5 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. REPLACE PRE-COLLISION CITY SENSOR


    1. Replace the pre-collision city sensor Click here.

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


    NEXT

  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.

      Tech Tips

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

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1AA4 and C1AA5 are not output A
      DTC C1AA4 or C1AA5 is output B

    A

    END (PRE-COLLISION CITY SENSOR WAS DEFECTIVE)

    B

    REPLACE YAW RATE SENSOR Click here