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Home >> Subaru >> 2018 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Brakes >> Traction Control >> Vehicle Stability Control (VSC) System >> Vehicle Stability Control System >> DTC C1330: FR Wheel Speed Sensor System Open Circuit/Excessive Input; DTC C1331: FL Wheel Speed Sensor System Open Circuit/Excessive Input; DTC C1464: FR Wheel Speed Sensor Signal; DTC C1465: FL Wheel Speed Sensor Signal >> Inspection steps
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Inspection steps

CAUTION: When the brake actuator ECM has been replaced, make sure to perform [VSC(VDC) Centering Mode]. (Refer to WORK SUPPORT )
  1. Data monitor check (wheel speed)
    1. Using SSM4, check [Data monitor] of [Wheel speed] while driving straight at a speed of 10 km/h or more. (Refer to DATA MONITOR )
      RANGE DESCRIPTION

      Item name Description/display range Normal value Remarks
      [Wheel Speed FR] Indicates the front right wheel speed.
      Display range: 0 to 326.4km/h      		 When stopping: 0km/h
      While driving at a stable speed: No large changes.      		 -
      [Wheel Speed FL] Indicates the front left wheel speed.
      Display range: 0 to 326.4km/h      		 When stopping: 0km/h
      While driving at a stable speed: No large changes.      		 -

      Criteria: There is no big difference from the speed meter.

      OK: Go to next step

      NG: Go to Step  3.

  2. Diagnostic code list recheck
    1. Using SSM4, clear the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
    2. Perform a driving test.
    3. Using SSM4 again, check the diagnostic code output. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
      RESULT DESCRIPTION

      Result Go to
      Normal A
      Error code B
      1. Go to next step
      2. Go to Step 3.

      Malfunction reproduction test (Refer to MALFUNCTION SYMPTOMS AND DTC CHECK )

  3. Speed sensor installation condition check
    1. Check installation condition of the speed sensor.

      Criteria: Properly installed.

      G12590962Courtesy of SUBARU OF AMERICA, INC.

      OK: Go to next step

      NG: Properly install the speed sensor or replace it.

  4. Speed sensor check (foreign matter adhesion)
    1. Remove the speed sensor from the relevant wheel and check it for foreign matter adhesion or damage at the tip. (Refer to REMOVAL ) Criteria: There is no foreign particles or damage.
      CAUTION: If there is no damage in the speed sensor through this check, do not replace the speed sensor.

      OK: Go to next step

      NG: Clean or replace the speed sensor.

  5. Check wiring harness and connector (front speed sensor - brake actuator ASSY)
    1. Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.

      Criteria: No trouble

    2. Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
    3. Disconnect the connector, A12 or A42 of the front speed sensor.
    4. Check the case and terminal of the connector for deformation and/or corrosion.

      Criteria: No deformation or corrosion.

    5. Measure the resistance between the terminals.

      Resistance

      STANDARD VALUE SPECIFICATION - RH

      Inspection terminals Inspection conditions Standard value
      A5-16(FR+) - A42-2(FR+) Always Less than 1 Ω
      A5-16(FR+) - chassis ground Always 10 k Ω or more
      A5-4(FR-) - A42-1(FR-) Always Less than 1 Ω
      A5-4(FR-) - chassis ground Always 10 k Ω or more
      STANDARD VALUE SPECIFICATION - LH

      Inspection terminals Inspection conditions Standard value
      A5-19(FL+) - A12-2(FL+) Always Less than 1 Ω
      A5-19(FL+) - chassis ground Always 10 k Ω or more
      A5-8(FL-) - A12-1(FL-) Always Less than 1 Ω
      A5-8(FL-) - chassis ground Always 10 k Ω or more

      OK: Go to next step

      NG: Repair or replacement of wiring harness or connector

  6. Skid control computer check (speed sensor power supply)
    CAUTION: Check voltage with front speed sensor connector connected and IG OFF→ON.
    1. Measure the voltage between the terminal and chassis ground.

      Voltage

      STANDARD VALUE SPECIFICATION - RH

      Inspection terminals Inspection conditions Standard value
      A42-2(FR+) - chassis ground IG ON 8 to 14V
      STANDARD VALUE SPECIFICATION - LH

      Inspection terminals Inspection conditions Standard value
      A12-2(FL+) - chassis ground IG ON 8 to 14V
      G12590963Courtesy of SUBARU OF AMERICA, INC.

      OK: Go to next step

      NG: Replacement of skid control computer (brake actuator ASSY) (Refer to REMOVAL )

  7. Diagnostic code list recheck
    1. Using SSM4, clear the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
    2. Perform a driving test.
    3. Using SSM4 again, check the diagnostic code output. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
      RESULT DESCRIPTION

      Result Go to
      Normal A
      Error code B
      1. Go to next step
      2. Go to Step 8.

      Malfunction reproduction test (Refer to MALFUNCTION SYMPTOMS AND DTC CHECK )

  8. Replacement of front speed sensor
    1. Replace the relevant front speed sensor with error code. (Refer to REMOVAL )
  9. Diagnostic code list recheck
    1. Using SSM4, clear the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
    2. Perform a driving test.
    3. Using SSM4 again, check the diagnostic code output. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
      RESULT DESCRIPTION

      Result Go to
      Normal A
      Error code B
      1. Go to next step
      2. Go to Step 10.

      Completed

  10. Replacement of speed sensor rotor
    1. Replace the relevant speed sensor rotor with error code. (Refer to FRONT AXLE HUB )
      NOTE: The speed sensor rotor is assembled in the front axle hub. Therefore, replace the front axle hub.
  11. Diagnostic code list recheck
    1. Using SSM4, clear the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
    2. Perform a driving test.
    3. Using SSM4 again, check the diagnostic code output. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
      RESULT DESCRIPTION

      Result Go to
      Normal A
      Error code B
      1. Go to next step
      2. Replacement of brake actuator ECM only (Refer to REMOVAL )

      Completed

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