The speed sensor on these vehicles is located on the top of the rear differential unit.
See Figure 1
- Remove the speed sensor from the rear differential.
- Confirm that the resistance between the connector terminals is 420-520 ohms.
- Measure the insulation resistance between the terminals 1, 2 and the speed sensor body. The standard value is 100 kilo-ohms or more.
- If the speed sensor fails either of these two tests, replace the speed sensor with a new unit.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable from the battery.
- Raise the rear of the vehicle and support with jackstands. Block the front wheels with wheel chocks.
- Locate the speed sensor mounting position on the differential and trace the cable back along its route until the connector is reached. Unplug the speed sensor wiring harness connector.
- Remove the several retaining brackets holding the speed sensor cable in place on the rear axle assembly. Make certain to note the locations of the various brackets and bolts.
- Loosen the retaining ring of the speed sensor on the differential by unscrewing it. Once the retaining ring has been loosened, pull the speed sensor out of the rear differential.
- Insert the speed sensor into the rear differential unit and tighten the retaining ring until snug.
- Route the speed sensor cable along its original placement. Fasten it in place with the various cable brackets. Plug the harness connectors back together.
- Lower the vehicle to the ground.
- Connect the negative cable to the battery.
- Have the system rechecked if a new speed sensor was installed and the problem continues.