VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC C0029 ANY OF WHEEL SENSORS SIGNAL

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

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

• EBD may not operate.

NOTE:

Brake warning light illuminates as well as ABS warning light when EBD does not operate.

WIRING DIAGRAM:

STEPCHECKYESNO

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. Clear the 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.

2.CHECK TIRE SPECIFICATIONS.

Turn the ignition switch to OFF.

Are the tire specifications correct?

Replace the tire.

3.CHECK WEAR OF TIRE.

Is the tire worn excessively?

Replace the tire.

4.CHECK TIRE INFLATION PRESSURE.

Is the tire pressure correct?

Adjust the tire pressure.

5.CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR.

Are the ABS wheel speed sensor installation bolts tightened 7.5 N·m (0.76 kgf-m, 5.5 ft-lb)? (For four wheels)

Tighten the ABS wheel speed sensor installation bolts.

6.CHECK ABS WHEEL SPEED SENSOR SIGNAL.

1) Install the ABS wheel speed sensor.

2) Prepare an oscilloscope.

3) Check the ABS wheel speed sensor.

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?

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?

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.

8.CHECK VDCCM&H/U.

1) Connect all connectors.

2) Clear the memory.

3) Perform the Inspection Mode.

4) Read the DTC.

Is the same DTC displayed?

Replace the VDCCM only.

9.CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diagnosis according to DTC.

It results from a temporary noise interference.

NOTE:

Though the ABS warning light remains on at this time, this is normal. Drive the vehicle at 12 km/h (7 MPH) or more in order to turn ABS warning light off. Be sure to drive the vehicle and check that the warning light goes off.