GM Lumina/Silhouette/Transport APVs 1990-1999 Repair Guide

Front Wheel Speed Sensor

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The front wheel speed sensors are of a variable reluctance type. Each sensor is attached to the knuckle assembly in close proximity to a toothed ring. This produces an AC voltage with a frequency proportional to the speed of the wheel. The magnitude of the voltage and frequency increase with increasing speed. The sensor is not repairable, nor is the air gap adjustable.

REMOVAL AND INSTALLATION



  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the tire and wheel assembly.
  6.  
  7. Unplug the wheel speed sensor electrical connector.
  8.  
  9. Remove the hub and bearing assembly. For more information, refer to Suspension and Steering of this repair guide.
  10.  
  11. Remove the wheel speed sensor from the hub and bearing assembly using a suitable prytool or equivalent tool.
  12.  

When the wheel speed sensor is removed it must be replaced. The speed sensor is damaged when it is removed and cannot be reused. There are two parts to the wheel speed sensor. These parts are replaced as an assembly. They cannot be replaced individually. In addition, inspect the bearing for signs of water intrusion, if intrusion is noted, the entire bearing assembly must be replaced.

See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Front wheel speed sensor location and mounting-right side shown, left side similar

To install:
  1. Apply Loctite® 620 to the mating surfaces of the wheel speed sensor that contacts the hub and bearing assembly.
  2.  
  3. Use a suitable press to press the new wheel speed sensor on to the hub and bearing assembly.
  4.  
  5. Install the hub and bearing assembly, as outlined in Suspension and Steering of this vehicle.
  6.  
  7. Attach the wheel speed sensor electrical connector.
  8.  
  9. Install the tire and wheel assembly.
  10.  
  11. Carefully lower the vehicle, then connect the negative battery cable.
  12.  

 
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