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Home › Subaru › 2020 › BRZ Limited, Automatic Trans › Repair and Diagnosis › Brakes › Traction Control › Vehicle Stability Control (VSC) System › Vehicle Stability Control System › DTC C1231: Steering Angle Sensor Malfunction › Inspection steps

Inspection steps

CAUTION:
  • When the steering sensor has been replaced, make sure to perform [VSC(VDC) Centering Mode]. (Refer to WORK SUPPORT )
  • Before performing troubleshooting, check the fuse for this circuit.
  1. Check the diagnosis codes
    1. Clear the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
    2. Turn the ignition switch to OFF.
    3. Turn IG ON again and check that no diagnostic code for CAN communication error is output. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
    4. Driving at 35 km/h or more and operating the steering wheel, make sure that no diagnostic code for speed sensor error and yaw rate sensor error is output. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
      RESULT DESCRIPTION

      Result Go to
      None of CAN communication error code, speed sensor error code, or yaw rate sensor error code is output. A
      CAN communication error code is output. B
      Speed sensor error code or yaw rate sensor error code is output C
      NOTE:
      • When there is a trouble in the speed sensor or the yaw rate sensor, even if the steering sensor is normal, abnormal value may be issued.
      • If both speed sensor error code and yaw rate sensor error code are output at the same time, repair them and then check the steering sensor.
      1. Go to next step
      2. Go to "CAN communication system (How to troubleshoot)" (Refer to HOW TO TROUBLESHOOT )
      3. Progress to the appropriate diagnosis code (Refer to LIST OF DIAGNOSTIC CODES )
  2. Check wiring harness and connector (steering sensor power supply)
    1. Check the steering sensor connector for poor engagement or disconnection.

      Criteria: No trouble 

    2. Disconnect the connector D56 for the steering sensor.
    3. Check the case and terminal of the connector for deformation and/or corrosion.

      Criteria: No deformation or corrosion. 

    4. Check the voltage and resistance between terminals.

      Voltage 

      STANDARD VALUE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      D56-4(IG) - chassis ground IG ON 11 to 14V

      Resistance 

      STANDARD VALUE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      D56-1(ESS) - chassis ground Always Less than 1 Ω
      G12590948Courtesy of SUBARU OF AMERICA, INC.

      OK: Go to next step

      NG: Repair or replacement of wiring harness or connector

      Replacement of steering sensor (Refer to REMOVAL )

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