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Home › Subaru › 2016 › BRZ Series.HyperBlue › 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 [VDC sensor midpoint setting 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

      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.

      B: To CAN communication system (How to troubleshoot) (Refer to HOW TO TROUBLESHOOT )

      C: To relevant diagnostic code (Refer to LIST OF DIAGNOSTIC CODES  )

      A: Go to next step

  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

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

      Resistance

      Inspection terminals Inspection conditions Standard value
      D56-1(ESS) - chassis ground Always Less than 1 Ω
      Fig 1: Steering Sensor Connector End View (D56)
      G10215434Courtesy of SUBARU OF AMERICA, INC.

      NG: Repair or replacement of wiring harness or connector

      OK: Replacement of steering sensor (Refer to REMOVAL  )

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