Saturn Coupes/Sedans/Wagons 1991-1998 Repair Guide

Wheel Speed Sensors

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REMOVAL & INSTALLATION



Front

See Figures 1 and 2

  1. Disconnect the negative battery cable, then raise the front of the vehicle and support using jackstands.
  2.  
  3. Unplug the electrical connector from the speed sensor.
  4.  
  5. Remove the Torx® head retaining screw from the top of the sensor.
  6.  
  7. Remove the wheel speed sensor from the vehicle.
  8.  
  9. Make sure the sensor locating pin was removed with the sensor. If the pin remained in the knuckle, pull it out with a pair of pliers. A pin which is stuck in the knuckle must be drilled out with an 8mm drill bit. Be very careful not to enlarge the locating hole in the knuckle; incorrect sensor location would result in loss of ABS operation.
  10.  
  11. Use a small wooden dowel with sand paper wrapped around it to clean the locating hole of any corrosion and allow proper sensor seating.
  12.  

To install:
  1. Position the sensor to the steering knuckle, making sure that it is fully seated.
  2.  
  3. Install the fastener and tighten to 89 inch lbs. (10 Nm).
  4.  
  5. Install the wiring harness connector to the sensor.
  6.  
  7. Remove the supports and lower the vehicle, then connect the negative battery cable.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: The front wheel speed sensor in mounted to the steering knuckle and can be replaced separately from other components



Click image to see an enlarged view

Fig. Fig. 2: View of the knuckle-mounted speed sensor and the sensor ring which is part of the halfshaft/CV-joint assembly-front ABS brakes

Rear

The rear ABS speed sensor is contained within the hub and bearing assembly and is not serviceable. If the sensor is damaged and in need of replacement, the entire hub and bearing assembly must be replaced. Refer to the rear suspension procedures in Suspension & Steering of this repair guide.

TESTING



See Figure 3

  1. Disconnect the negative battery cable.
  2.  
  3. Disengage the wheel speed sensor connector.
  4.  
  5. Using an ohmmeter, measure the resistance circuit A and B of the wheel speed sensor connector.
  6.  
  7. If the resistance measures below 200 ohms, circuit B is shorted to ground. If the resistance measures above 200 ohms, replace the wheel speed sensor.
  8.  
  9. If necessary, repeat these steps for the other speed sensors.
  10.  



Click image to see an enlarged view

Fig. Fig. 3: Wheel speed sensor schematic

 
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