lemon-mirror:
Home >> GMC >> 2002 >> C3500 HD 6.5 F, Automatic >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Repair Instructions >> Wheel Speed Sensor Replacement >> Installation Procedure

Installation Procedure

NOTE: The wheel speed sensor used on the C 3500HD models is adjustable by means of slots provided in the mounting bracket. The sensor must be properly adjusted in order to provide the correct air gap between the wheel speed sensor and the tone wheel. If the sensor is not properly adjusted, the tone wheel may hit the wheel speed sensor, or the output from the wheel speed sensor may be low, missing or erratic. Follow the procedure outlined below to properly adjust the front wheel speed sensor.
  1. Install the wheel speed sensor (3) to the mounting bracket (4).
  2. Install wheel speed sensor to bracket mounting nuts (5).
  3. Run down the nuts but do not torque. The wheel speed sensor must remain loose and move along the slots in the bracket.
    Fig 1: Wheel Speed Sensor, Mounting Bracket & Nut
    G01586350Courtesy of GENERAL MOTORS CORP.
  4. Place the front hub and rotor assembly on a flat surface with the tone wheel facing up. Take care not to damage the wheel studs.
  5. Mark the position of the rotor relative to the hub so the rotor can be installed in the same position later.
  6. Remove bolts (22) attaching the rotor (21) to the hub (14).
  7. Remove the rotor from the hub.
  8. Install the bearing seal (12) and inner bearing (20).
  9. Install hub and tone wheel assembly (14) on the knuckle spindle (3), taking care not to damage the wheel speed sensor with the tone ring.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  10. Install the hub outer bearing (15), washer (16) and wheel bearing nut (19).

    Tighten 

    Tighten the wheel bearing nut (19) to 16 N.m (12 lb ft) while rotating the hub (14) in either direction to ensure proper centering.

  11. Do not back off the wheel bearing nut.
    Fig 2: Exploded View Of Wheel Hub Assembly
    G01586351Courtesy of GENERAL MOTORS CORP.
    NOTE: DO NOT use a rigid feeler gauge or a wire spark plug gap gauge to set the wheel speed sensor to tone wheel air gap as these tools will not result in the correct air gap.
  12. Insert flexible shim stock or equivalent between the tone wheel (1) and the wheel speed sensor (4).
  13. The thickness of the shim stock must be 1.5 mm (0.060 in). The length and width of the shim stock must be sufficient enough to cover the face of the wheel speed sensor. If shim stock is not available, regular notebook or writing paper can be used provided the specified thickness is inserted between the tone wheel and the wheel speed sensor.
  14. Press the wheel speed sensor firmly against the shim stock and tone wheel.
    Fig 3: Tone Wheel & Wheel Speed Sensor
    G01586352Courtesy of GENERAL MOTORS CORP.
  15. Use the following procedure for tightening the WSS nuts (6):

    Tighten 

    1. 15.1. Tighten the left hand lower attaching nut to 13 N.m (10 lb ft).
    2. 15.2. Tighten the left hand upper attaching nut to 13 N.m (10 lb ft).
    3. 15.3. Tighten the right hand upper attaching nut to 13 N.m (10 lb ft).
    4. 15.4. Tighten the right hand lower attaching nut to 13 N.m (10 lb ft) while holding the wheel speed sensor against the shim stock.
    Fig 4: Wheel Speed Sensor, Mounting Bracket & Nut
    G01586353Courtesy of GENERAL MOTORS CORP.
  16. Remove the shim stock from between the tone wheel (1) and the wheel speed sensor (4).
  17. Inspect that the tone wheel does not contact the wheel speed sensor when the hub and tone wheel are rotated. Readjust if necessary.
    Fig 5: Tone Wheel & Wheel Speed Sensor
    G01586354Courtesy of GENERAL MOTORS CORP.
  18. Install the splash shield (8) to the anchor plate (9).
    Fig 6: Exploded View Of Wheel Hub Assembly
    G01586355Courtesy of GENERAL MOTORS CORP.
  19. Take care to route the wheel speed sensor wire (4) through the opening in the splash shield (1) near the center mounting hole.
    Fig 7: Wheel Speed Sensor Wire Routing & Components
    G01586356Courtesy of GENERAL MOTORS CORP.
  20. Install 3 splash shield mounting bolts (10).

    Tighten 

    Tighten bolts to 17 N.m (13 lb ft).

    Fig 8: Exploded View Of Wheel Hub Assembly
    G01586357Courtesy of GENERAL MOTORS CORP.
  21. Route the wheel speed sensor wire (4) between the splash shield (1) and the knuckle.
  22. Install the wheel speed sensor mounting clip (6) to the upper king pin cap.

    Tighten 

    Tighten the bolt (2) to 17 N.m (13 lb ft).

    Fig 9: Wheel Speed Sensor Wire Routing & Components
    G01586358Courtesy of GENERAL MOTORS CORP.
  23. Install the wheel speed sensor mounting clip (5) to the inside frame rail.

    Tighten 

    Tighten the bolt (6) to 17 N.m (13 lb ft).

    Fig 10: Wheel Speed Sensor Mounting Clip & Bolt
    G01586359Courtesy of GENERAL MOTORS CORP.
  24. Connect the wheel speed sensor cable electrical connector (1).
    Fig 11: Wheel Speed Sensor Cable Electrical Connector
    G01586360Courtesy of GENERAL MOTORS CORP.
  25. Remove wheel hub and tone wheel assembly (14) from the steering knuckle (3).

    Important:  Take care to line up reference position marks.

  26. Install hub rotor to wheel hub (22).
  27. Install rotor to hub attaching bolts.

    Tighten 

    Tighten bolts (22) to 237 N.m (175 lb ft).

  28. Install the hub (14) and rotor (21). Refer to WHEEL HUB, BEARING, AND SEAL REPLACEMENT in Front Suspension.
  29. Install tire and wheel. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION .
    Fig 12: Exploded View Of Wheel Hub Assembly
    G01586361Courtesy of GENERAL MOTORS CORP.
· About lemon-mirror