GM Astro/Safari 1985-1996 Repair Guide

Vehicle Speed Sensor

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The vehicle speed sensor is mounted in the transmission tail housing on 2WD vehicles and in the transfer case on 4WD vehicles.

TESTING



See Figure 1



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Fig. Fig. 1: Vehicle speed sensor resistance chart

  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle and support with jackstands.
  4.  
  5. Disconnect the vehicle speed sensor wiring.
  6.  
  7. Measure the resistance of the sensor and compare to the chart.
  8.  
  9. Replace the sensor if the resistance does not meet specification.
  10.  

REMOVAL & INSTALLATION



See Figures 2, 3, 4, 5 and 6



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Fig. Fig. 2: Vehicle speed sensor mounting



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Fig. Fig. 3: Unplug the weatherpak connector from the VSS



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Fig. Fig. 4: The VSS is held by the one bolt and clamp



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Fig. Fig. 5: Withdraw the VSS from the transmission or transaxle



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Fig. Fig. 6: Fluid will come out of the VSS opening so be ready to catch the spillage

  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle and support with jackstands.
  4.  
  5. Disconnect the sensor connector.
  6.  
  7. Remove the bolt and sensor by pulling the sensor from the transmission or transaxle housing. Fluid will drip out of the opening, so be ready to catch the spillage.
  8.  

To install:
  1. Install a new O-ring on the vehicle speed sensor and coat with transmission fluid.
  2.  
  3. Install the sensor, bolts and torque to 97 inch lbs. (11 Nm).
  4.  
  5. Connect the electrical connector.
  6.  
  7. Connect the negative battery cable and check transaxle or transmission fluid level.
  8.  

 
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