Ram 1500, 2500, 3500, 2WD & 4WD, 2001 - 2005

Brake Speed Sensor

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Testing



Air Gap
  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.

    Click image to see an enlarged view

    Fig.

  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).Measure and record the distance (A) between the sensor mounting surface of the differential case and the teeth at the top of the exciter ring

    Click image to see an enlarged view

    Fig.

  10.  

Resistance Test
  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.  

 
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