Chrysler Full-Size Vans 1989-1998 Repair Guide

Speed Sensor

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TESTING



Resistance
  1. Raise and safely support the vehicle securely on jackstands.
  2.  
  3. Ensure the ignition key is in the OFF position.
  4.  
  5. Disconnect the speed sensor electrical harness.
  6.  
  7. Measure resistance between the terminals on the speed sensor
  8.  
  9. Resistance should be 1000-2500 ohms.
  10.  
  11. If resistance is not within specification, check the harness for continuity.
  12.  
  13. If continuity exists, the sensor is faulty.
  14.  

Air Gap

See Figures 1 and 2



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Fig. Fig. 1: Measure and record the distance between the sensor mounting surface of the differential case and the teeth at the top of the exciter ring



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Fig. Fig. 2: Measure and record the distance from the underside of the sensor flange to the end of the sensor pole piece

  1. Raise and safely support the vehicle securely on jackstands.
  2.  
  3. Remove the sensor from the differential.
  4.  
  5. Measure and record the distance from the underside of the sensor flange to the end of the sensor pole piece. This distance represents dimension "B". This dimension should be 1.07-1.08 in. (27.18-27.43mm). If dimension is not within specification, replace the speed sensor.
  6.  
  7. Measure and record the distance between the sensor mounting surface of the differential case and the teeth at the top of the exciter ring. This distance represents dimension "A". This dimension should be 1.085-1.120 in. (27.56-28.45mm). If dimension is not within specification, replace the exciter ring.
  8.  
  9. Subtract dimension "B" from dimension "A" to determine sensor air gap. The gap should be 0.005-0.050 in. (0.127-1.27mm).
  10.  

REMOVAL & INSTALLATION



See Figures 3, 4 and 5



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Fig. Fig. 3: The rear wheel speed sensor connector is located at the top of the rear axle's differential housing



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Fig. Fig. 4: The sensor wire harness is attached to the rear axle with a single bolt



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Fig. Fig. 5: The magnetic speed sensor fits inside a hole in the rear axle, and reads off a tone ring on the ring gear

  1. Raise the vehicle and support it safely.
  2.  
  3. Remove the sensor hold-down bolt.
  4.  
  5. Remove the sensor shield and sensor from the differential by pulling the sensor straight out.
  6.  
  7. Disconnect the wiring and remove the sensor.
  8.  

To install:
  1. Connect the wiring to the sensor. Make sure the seal is in place between the sensor and wiring connector.
  2.  
  3. Install the sensor into the differential housing, making sure the new O-ring is in place.
  4.  
  5. Install the sensor shield.
  6.  
  7. Install the sensor hold-down bolt and tighten it to 170-230 inch lbs. (19-29 Nm).
  8.  
  9. Lower the vehicle.
  10.  

 
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