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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Brakes >> Brakes Control Systems >> Brake Control System (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC C1252 Wheel Speed Sensor Signal Of One Of The Wheels >> Trouble symptom

DTC C1252 Wheel Speed Sensor Signal Of One Of The Wheels: Trouble symptom

NOTE: Brake warning light comes on as well as ABS warning light when EBD does not operate.
  1. WHETHER A WHEEL TURNED FREELY OR NOT. 

    Check if the wheels have been turned freely for one minute or more, such as when the vehicle is jacked-up, under full-lock cornering or when the wheels are not in contact with road surface.

    Did the wheels turn freely?

    • Yes  : VDC is normal. Clear the memory. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Clear memory .
      NOTE: This diagnostic trouble code may sometimes occur if the wheels turn freely for a long time, for example when the vehicle is towed or jacked-up, or when steering wheel is continuously turned all the way.
    • No  : Go to 2. 
  2. CHECK TIRE SPECIFICATIONS. 

    Turn the ignition switch to OFF.

    Are the tire specifications correct?

    • Yes  : Go to 3. 
    • No  : Replace the tire.
  3. CHECK WEAR OF TIRE. 

    Is the tire worn excessively?

    • Yes  : Replace the tire.
    • No  : Go to 4. 
  4. CHECK TIRE INFLATION PRESSURE. 

    Is the tire pressure correct?

    • Yes  : Go to 5. 
    • No  : Adjust the tire pressure.
  5. CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR. 

    Are the ABS wheel speed sensor installation bolts tightened to 7.5 N.m (0.76 kgf-m, 5.5 ft-lb)? (Four wheels)

    • Yes  : Go to 6. 
    • No  : Tighten the ABS wheel speed sensor installation bolts.
  6. CHECK ABS WHEEL SPEED SENSOR SIGNAL. 
    1. Prepare an oscilloscope.
    2. Check the ABS wheel speed sensor. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>Front ABS Wheel Speed Sensor>INSPECTION>CHECK ABS WHEEL SPEED SENSOR UNIT . Ref. to VEHICLE DYNAMICS CONTROL (VDC)>Rear ABS Wheel Speed Sensor>INSPECTION>CHECK ABS WHEEL SPEED SENSOR UNIT .

    Does the oscilloscope indicate the waveform pattern as shown in the figure when the tires are turning? Or does the oscilloscope indication repeat the waveform pattern like shown in the figure when the tire is slowly turned in equal speed for one rotation or more? (Four wheels)

    • Yes  : Go to  8.
    • No  : Go to 7. 
  7. CHECK ABS WHEEL SPEED SENSOR OR MAGNETIC ENCODER. 

    Are there foreign matters adhered to the tip of ABS wheel speed sensor or magnetic encoder? Or is there any breakage or damage? (Four wheels)

    • Yes  : Remove dirt thoroughly. Also replace the ABS wheel speed sensor or magnetic encoder as a unit with hub unit bearing if it is broken or damaged.
    • No  : Go to 8. 
  8. CHECK VDCCM&H/U. 
    1. Connect all connectors.
    2. Clear the memory. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Clear memory .
    3. Perform the Inspection Mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode .
    4. Read the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

    Is the same DTC displayed?

  9. CHECK DETECTION OF OTHER DTCS FOR VDC. 

    Ref. to BRAKE CONTROL (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

    Is any other DTC displayed?

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