Subaru Crosstrek Service Manual: Dtc c1252 wheel speed sensor signal of one of the wheels

DTC detecting condition:

• Defective ABS wheel speed sensor signal (noise, irregular signal, etc.)

• Defective magnetic encoder

• When a wheel is turned freely for a long time

• ABS does not operate.

• VDC does not operate.

• EBD may not operate.

• Hill start assist does not operate.

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?

VDC is normal. Perform the Clear Memory Mode. Clear Memory Mode">

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.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS">Go to Step 2.

2.CHECK TIRE SPECIFICATIONS.

Turn the ignition switch to OFF.

Are the tire specifications correct?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS">Go to Step 3.

Replace the tire.

3.CHECK WEAR OF TIRE.

Is the tire worn excessively?

Replace the tire.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS">Go to Step 4.

4.CHECK TIRE INFLATION PRESSURE.

Is the tire pressure correct?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS">Go to Step 5.

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)? (For four wheels)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS">Go to Step 6.

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. Front ABS Wheel Speed Sensor > INSPECTION"> Rear ABS Wheel Speed Sensor > INSPECTION">

Does the oscilloscope indicate the waveform pattern like shown in the figure when the tire is slowly turned? 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? (For all four wheels)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS">Go to Step 8.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS">Go to Step 7.

7.CHECK ABS WHEEL SPEED SENSOR OR MAGNETIC ENCODER.

Are there foreign matter, breakage or damage at the tip of ABS wheel speed sensor or magnetic encoder? (For all four wheels)

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.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS">Go to Step 8.

8.CHECK VDCCM&H/U.

1) Connect all connectors.

2) Perform the Clear Memory Mode. Clear Memory Mode">

3) Perform the Inspection Mode. Inspection Mode">

4) Read the DTC. Read Diagnostic Trouble Code (DTC)">

Is the same DTC displayed?

Replace the VDCCM only. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U) > REPLACEMENT">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1252 WHEEL SPEED SENSOR SIGNAL OF ONE OF THE WHEELS">Go to Step 9.

9.CHECK DETECTION OF OTHER DTCS FOR VDC.

Read Diagnostic Trouble Code (DTC)">

Is any other DTC displayed?

Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)">

Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.

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