Jeep Wagoneer/Commando/Cherokee 1984-1998

Speed Sensors

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TESTING



See Figure 1

  1. Check the wheel speed sensor air gap using a brass feeler gauge. On the rear sensors, if the air gap measures out of specifications, adjust to the correct specifications. On the front sensors, if the air gap measures out of specifications, the sensor is broken or loose.
  2.  
  3. Disengage the speed sensor wiring harness connector. Inspect the condition of the connector and repair if necessary.
  4.  
  5. Using an ohmmeter, measure the resistance between the wheel speed sensor connector terminals.
  6.  
  7. The resistance should measure between 900-1300 ohms. If the resistance measures outside this value, replace the wheel speed sensor.
  8.  



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Fig. Fig. 1: Checking wheel speed sensor resistance

Removal & Installation



Front

See Figures 2, 3, 4 and 5



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Fig. Fig. 2: Location of the front ABS wheel speed sensor (1) in the steering knuckle and sensor tone ring (2)

  1. Raise the vehicle and safely support it with jackstands.
  2.  
  3. Turn the wheel outward.
  4.  
  5. Disengage the sensor wire and clean the sensor and surrounding area.
  6.  



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Fig. Fig. 3: Remove the speed sensor mounting bolt ...



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Fig. Fig. 4: ... then remove the sensor from the steering knuckle



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Fig. Fig. 5: Disengage the speed sensor wires from the routing brackets

  1. Unfasten the sensor attaching bolt
  2.  
  3. Remove the grommet retaining the sensor wire in the wheel house panel.
  4.  
  5. Disengage the sensor wire from the harness plug in the engine compartment and remove the sensor.
  6.  

To install:

There is no front sensor air gap adjustment. The air gap should be 0.057-0.051 in. (0.04-1.30mm). If the air gap is incorrect, the sensor is broken or loose.

  1. Install the sensor on the steering knuckle, apply Loctite® to the sensor bolt and tighten the bolt finger-tight only.
  2.  
  3. Tighten the bolt to 11 ft. lbs. (14 Nm) and attach the sensor wire to the steering knuckle with grommets.
  4.  
  5. Route the sensor wire to its original locations.
  6.  
  7. Seat the sensor wire grommet in the body panel and clip the wire to the brake line at the grommet location.
  8.  
  9. Engage the sensor wire to the harness in the engine compartment.
  10.  
  11. Lower the vehicle.
  12.  

Rear

See Figures 6, 7, 8, 9, 10 and 11



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Fig. Fig. 6: Using a small flat bladed tool, pry open the plastic retainers to free the speed sensor wiring harness



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Fig. Fig. 7: Using a small flat bladed tool, push the wheel speed sensor wiring harness rubber grommet through the brake backing plate



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Fig. Fig. 8: Using a box wrench, loosen the speed sensor mounting bolt



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Fig. Fig. 9: Remove the speed sensor by passing it throiugh the backing plate hole

  1. Raise and fold the rear seat to gain access to the rear sensor connectors.
  2.  
  3. Disengage the sensors at the rear harness connectors and push the sensor grommets and wires through the floorpan.
  4.  
  5. Raise the vehicle and support it with jackstands.
  6.  
  7. Disengage the sensor wires at the rear axle connectors. Remove the wheels.
  8.  
  9. Remove the brake drum and the clips securing the sensor wires to the brake lines, hoses and rear axle.
  10.  
  11. Unseat the sensor support plate grommet and unfasten the bolt securing the sensor to the bracket. Remove the sensor from the vehicle.
  12.  



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Fig. Fig. 10: Clean off the wheel speed sensor with a shop rag and inspect it for damage, corrosion or excessive wear

To install:
  1. Insert the sensor wire through the support plate hole and seat the sensor grommet in the support plate.
  2.  
  3. Apply Loctite® to the bolt and install the sensor. Fasten the bolt finger-tight only at this time.
  4.  
  5. Set the sensor air gap as follows:
    1. If installing the original sensor, remove any remaining pieces of cardboard from the pickup face. Then, using a brass feeler gauge, adjust the gap to 0.043 in. (1.1mm).
    2.  
    3. Tighten the sensor retaining bolt to 11 ft. lbs. (14 Nm).
    4.  
    5. If installing a new sensor, push the cardboard spacer on the sensor face against the tone face.
    6.  
    7. Tighten the sensor retaining bolt to 6 ft. lbs. (8 Nm). The correct air gap will be established as the tone ring rotates and peels the spacer off the sensor face.
    8.  

  6.  



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Fig. Fig. 11: When setting the air gap on the original rear sensor, use a brass feeler gauge only

  1. Route the sensor wires to the rear seat area. Feed the wires through the floorpan and install the sensor grommets.
  2.  
  3. Secure the sensor wires with the retaining clips located on the brake hoses, lines and rear axle.
  4.  
  5. Install the brake drum and wheel and lower the vehicle.
  6.  
  7. Engage the sensor wire to harness connector and return the carpet and seat to their proper position.
  8.  

 
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