Volkswagen Cars 2000-05

Wheel Speed Sensors

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The impulse (speed sensors) are located at each wheel and provide the speed reference to the control unit. The sensors are permanently magnetized inductive sensors that read pulses from a tooth wheel on each hub. A voltage signal is generated as each tooth passes through the magnetic field. The sensors are replaceable.

Removal & Installation



  1. Raise and safely support the vehicle.
  2.  
  3. Remove the wheel and unbolt the sensor from the steering knuckle or stub axle.
  4.  
  5. The rotor portion of the sensor assembly is secured to the inside of the wheel hub. To remove the front rotor, the hub must be pressed out of the front wheel bearing.
  6.  
  7. On the rear wheels, the sensor is pressed into the brake rotor. To remove it:

    Remove the wheel bearing and the brake rotor.
     
    Insert a drift pin through the wheel bolt holes and gently tap the speed sensor rotor out a little bit at each hole, much like removing an inner wheel bearing race.
     

  8.  

To install:

  1. When reinstalling, use a suitable sleeve to drive the speed sensor rotor into the brake rotor evenly. When the cover ring is installed, the distance from the ring to the splash shield should be 0.375 inch (9.5mm).
  2.  
  3. When reinstalling the sensor, use a dry lubricant on the sides of the sensor and tighten the bolt to 7 ft. lbs. (10 Nm).
  4.  

Front
  1. Make sure the ignition switch is in the OFF position.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the front wheels.
  6.  
  7. Remove the boot from the inner wheel housing and disconnect the electrical connector.
  8.  
  9. Carefully pull the sensor out of the wheel bearing housing (knuckle).
  10.  
  11. Installation is in reverse order of removal noting the following:
  12.  
  13. Clean the mounting hole in the bearing housing and apply a light coating of a lubricating paste, such as Part No. G 000 650.
  14.  
  15. Using a new clamping sleeve, apply a light coating of a proper lubricating paste and install the sleeve into the housing, then install the sensor.
  16.  



Click image to see an enlarged view

Fig. The front ABS impulse sensor is pressed into the bearing holder (knuckle) and retained by a tensioning sleeve

  1. Raise and safely support the vehicle.
  2.  
  3. Remove the wheel and tire assembly.
  4.  
  5. Disconnect the wheel speed sensor wiring connector.
  6.  
  7. Remove the bolt from the wheel bearing housing.

    Click image to see an enlarged view

    Fig. Detach the wheel speed sensor connector (1), then remove the bolt (2) from the wheel bearing housing

  8.  
  9. Remove wheel speed sensor from wheel bearing housing.

    Click image to see an enlarged view

    Fig. Exploded view of the front wheel speed sensor and related components

  10.  

To install:

  1. Before installing the speed sensor, clean mounting hole inner surface and coat sensor with lubricant G 000 650.
  2.  
  3. Install the speed sensor into mounting hole in wheel bearing housing, then tighten the bolt to 70 inch lbs. (8 Nm).
  4.  
  5. Connect wheel speed sensor wiring connector.
  6.  
  7. Turn wheels fully to left and right lock and check clearance of speed sensor wiring.
  8.  
  9. Install the wheel and tire assembly, then carefully lower the vehicle.
  10.  

Rear
  1. Make sure the ignition switch is in the OFF position.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the rear wheels.
  6.  
  7. Detach the electrical connector and remove the wire harness from the retaining guides.
  8.  
  9. Carefully pull the sensor out of the wheel bearing housing (knuckle).
  10.  
  11. Installation is in reverse order of removal noting the following:
  12.  
  13. Clean the mounting hole in the bearing housing and apply a light coating of a lubricating paste such as Part No. G 000 650.
  14.  
  15. Using a new clamping sleeve, apply a light coating of a proper lubricating paste and install the sleeve into the housing, then install the sensor.
  16.  



Click image to see an enlarged view

Fig. The rear ABS impulse sensor is pressed into the rear hub on Front Wheel Drive vehicles, and into the bearing holder (knuckle) on All Wheel Drive vehicles, and retained by a tensioning sleeve

With Rear Disc Brakes
  1. Raise and safely support the vehicle.
  2.  
  3. Remove the wheel and tire assembly.
  4.  
  5. Disconnect the wheel speed sensor and speed sensor wiring connector.
  6.  
  7. Remove the bolt from stub axle.

    Click image to see an enlarged view

    Fig. Detach the wheel speed sensor connector (1), then remove the bolt (2) from the stub axle

  8.  
  9. Pull the ABS wheel speed sensor out of the stub axle.

    Click image to see an enlarged view

    Fig. Exploded view of the rear wheel speed sensor and related components

  10.  

To install:

  1. Before inserting wheel speed sensor, clean mounting hole inner surface and coat speed sensor with lubricant G 000 650.
  2.  
  3. Insert the wheel speed sensor into hole in stub axle and tighten bolt to 8 Nm (70 in. lb).
  4.  
  5. Connect the wheel speed sensor to speed sensor wiring.
  6.  
  7. Install the wheel and tire, then carefully lower the vehicle.
  8.  

With Rear Drum Brakes
  1. Raise and safely support the vehicle.
  2.  
  3. Disconnect the wheel speed sensor and speed sensor wiring connector.
  4.  
  5. Remove the bolt from the stub axle.

    Click image to see an enlarged view

    Fig. Detach the sensor wiring connector (1), then remove the bolt (2) from the stub axle

  6.  
  7. Pull the ABS wheel speed sensor out of stub axle.
  8.  

To install:

  1. Before inserting the speed sensor, clean mounting hole inner surface and coat speed sensor with lubricant G 000 650.
  2.  
  3. Insert the speed sensor into hole in stub axle and tighten bolt to 8 Nm (70 in. lb).
  4.  
  5. Connect the speed sensor to speed sensor wiring.
  6.  
  7. Carefully lower the vehicle.
  8.  

 
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