RAM 2500 Truck 2WD V8-5.9L VIN Z (1997)
Wheel Speed Sensor: Testing and Inspection
CHECKING AIR GAP
1. Remove sensor from differential.
Checking RWAL Speed Sensor Air Gap
2. 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.
3. Measure and record the distance between the sensor mounting surface of differential case and teeth at top of the exciter ring. This distance
represents dimension A.
4. Subtract dimension B from dimension A to determine the Rear Wheel Antilock (RWAL) speed sensor air gap. The gap should be a minimum of
0.127 mm (0.005 inch) and a maximum of 1.27 mm (0.050 inch).
5. If air gap is not within stated limits, proceed as follows:
a. Dimension B distance should be 27.18-27.43 mm (1.07-1.08 inch). If the RWAL speed sensor is not within these limits, replace the RWAL
speed sensor.
b. Dimension A distance should be 27.56-28.45 mm (1.085-1.120 inch). If dimension A is not within the specification, replace the exciter ring or
repair the differential.
c. If dimension A and dimension B exceeds their specifications, replace both the RWAL speed sensor and exciter ring. Also, repair the
differential if necessary.
