Avalanche, Sierra, Silverado, C&K Series, 1999-2005

Wheel Speed Sensors 2

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Removal & Installation



Rear

NOTE
The signal for the rear wheel comes from the Vehicle Speed Sensor (VSS) mounted to the transmission tail housing (2WD) or to the transfer case (4WD).



Click image to see an enlarged view

Fig. Vehicle speed sensor mounting-Automatic transmission shown, manual similar



Click image to see an enlarged view

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

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

  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:
    1. Automatic transmission: 97 inch lbs. (11 Nm).
    2.  
    3. Manual transmission: 16 ft. lbs. (22 Nm)
    4.  

  4.  
  5. Connect the electrical connector.
  6.  
  7. Connect the negative battery cable and check transaxle or transmission fluid level.
  8.  


NOTE
The signal for the rear wheel comes from the Vehicle Speed Sensor (VSS) mounted to the transmission tail housing (2WD) or to the transfer case (4WD).



Click image to see an enlarged view

Fig. Vehicle speed sensor mounting-Automatic transmission shown, manual similar



Click image to see an enlarged view

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

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

  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:
    1. Automatic transmission: 97 inch lbs. (11 Nm).
    2.  
    3. Manual transmission NV3500 and NV4500: 142 inch lbs. (16 Nm)
    4.  
    5. Manual transmission ZF S6-650: 89 inch lbs. (10 Nm)
    6.  

  4.  
  5. Connect the electrical connector.
  6.  
  7. Connect the negative battery cable and check transaxle or transmission fluid level.
  8.  


NOTE
The signal for the rear wheel comes from the Vehicle Speed Sensor (VSS) mounted to the transmission tail housing (2WD) or to the transfer case (4WD).



Click image to see an enlarged view

Fig. Vehicle speed sensor mounting-Automatic transmission shown, manual similar



Click image to see an enlarged view

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

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

  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:
    1. Automatic transmission: 97 inch lbs. (11 Nm).
    2.  
    3. Manual transmission: 16 ft. lbs. (22 Nm)
    4.  

  4.  
  5. Connect the electrical connector.
  6.  
  7. Connect the negative battery cable and check transaxle or transmission fluid level.
  8.  

Rear Wheel Mounted
  1. Raise and properly support the vehicle.
  2.  
  3. Remove the tire and wheel.
  4.  
  5. Remove the brake rotor .
  6.  
  7. Remove the WSS cable mounting clip from the frame attachment point.
  8.  
  9. Remove the WSS cable electrical connector.
  10.  
  11. Remove the wheel speed sensor (WSS) mounting bolt.
    WARNING
    Carefully remove the sensor by pulling it straight out of the bore. DO NOT use a screwdriver, or other device to pry the sensor out of the bore. Prying will cause the sensor body to break off in the bore.



    Click image to see an enlarged view

    Fig. Rear wheel speed sensor mounting

  12.  
  13. Remove the wheel speed sensor from the hub/bearing assembly.
  14.  

To install:

  1. Plug the WSS bore to prevent debris from falling into the hub.
  2.  
  3. Using a wire brush or equivalent, clean the WSS mounting surface on the hub to remove any rust or corrosion.
  4.  
  5. Apply a thin layer of wheel bearing lubricant to the hub surface and the sensor O-ring prior to sensor installation.
  6.  
  7. Install the WSS. Ensure that the sensor is seated flat against the hub.
  8.  
  9. Install the WSS mounting bolt.
    1. Tighten the WSS mounting bolt to 80 inch lbs. (9 Nm).
    2.  

  10.  
  11. Install the WSS cable mounting clip to the frame attachment point.
  12.  
  13. Connect the WSS cable electrical connector.
  14.  
  15. Install the brake rotor.
  16.  
  17. Install the tire and wheel.
  18.  

  1. Raise and properly support the vehicle.
  2.  
  3. Remove the tire and wheel.
  4.  
  5. Remove the brake rotor .
  6.  
  7. Remove the WSS cable mounting clip from the frame attachment point.
  8.  
  9. Remove the WSS cable electrical connector.
  10.  
  11. Remove the wheel speed sensor (WSS) mounting bolt.
    WARNING
    Carefully remove the sensor by pulling it straight out of the bore. DO NOT use a screwdriver, or other device to pry the sensor out of the bore. Prying will cause the sensor body to break off in the bore.



    Click image to see an enlarged view

    Fig. Rear wheel speed sensor mounting

  12.  
  13. Remove the wheel speed sensor from the hub/bearing assembly.
  14.  

To install:

  1. Plug the WSS bore to prevent debris from falling into the hub.
  2.  
  3. Using a wire brush or equivalent, clean the WSS mounting surface on the hub to remove any rust or corrosion.
  4.  
  5. Apply a thin layer of wheel bearing lubricant to the hub surface and the sensor O-ring prior to sensor installation.
  6.  
  7. Install the WSS. Ensure that the sensor is seated flat against the hub.
  8.  
  9. Install the WSS mounting bolt.
    1. Tighten the WSS mounting bolt to 80 inch lbs. (9 Nm).
    2.  

  10.  
  11. Install the WSS cable mounting clip to the frame attachment point.
  12.  
  13. Connect the WSS cable electrical connector.
  14.  
  15. Install the brake rotor.
  16.  
  17. Install the tire and wheel.
  18.  
  19. Using a scan tool, perform the Diagnostic System Check - ABS
  20.  

Transmission Mounted


Click image to see an enlarged view

Fig. Vehicle speed sensor mounting-automatic transmission shown, manual similar



Click image to see an enlarged view

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

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

  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. Engage the electrical connector.
  6.  
  7. Connect the negative battery cable and check transaxle or transmission fluid level.
  8.  



Click image to see an enlarged view

Fig. Vehicle speed sensor mounting-automatic transmission shown, manual similar



Click image to see an enlarged view

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

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

  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:
    1. Automatic transmission: 97 inch lbs. (11 Nm).
    2.  
    3. Manual transmission NV3500 and NV4500: 142 inch lbs. (16 Nm)
    4.  
    5. Manual transmission ZF S6-650: 89 inch lbs. (10 Nm)
    6.  

  4.  
  5. Engage the electrical connector.
  6.  
  7. Connect the negative battery cable and check transaxle or transmission fluid level.
  8.  

 
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