How to: Dodge Ram 1500 Rear Wheel Speed Sensor Testing and Replacement

Описание: How to troubleshoot and replace the rear wheel speed sensor on a third generation #Dodge Ram. This particular truck is a 2006 1500 4wd model. With a faulty sensor or an issue in the circuit, this will trigger both an abs and brake light and you may notice issues with the speedometer. The speedometer may be intermediate or not functioning at all. #dodgeram

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Tools/Supplies Needed:
-13mm deep socket
-14mm deep socket and wrench
-3/8" drive ratchet
-multimeter
-electronics cleaner
-new rear wheel speed sensor

Procedure:
When scanning with an OBD2 reader, you’ll have a rear-wheel speed sensor circuit code. Keep in mind, not all code readers will be able to scan brake codes.

Locating the abs module which is located under the hood behind the battery. There is a connector that needs to be disconnected, to do that, pull back the red lock clip, then depress the tab and pull off the connection. Look for any corrosion.

With the plug disconnected, using a multimeter, test the resistance between pin 1 and 8. Probe each of the pins, here we are looking between 1600 to 2300 ohms at about 24.5C or 76F. My sensor was within the range, however I was getting intermediate readings, so my sensor was faulty. If your sensor is outside of the resistance range, then it is faulty and would need to be replaced too.

Leaving the plug disconnect on the ABS module, continue to disconnect the plug on the rear speed sensor. This is located on the top of the differential, the easiest way I have found to access the sensor is going up in between the axle and spare tire. To disconnect the plug, use a standard screwdriver to pull the locking clip back, then pull the plug off. Inspect the plug for any damage and corrosion.

The plug will need to be probed and this will determine if there’s a short to the body. Set the multimeter to the lowest ohms setting, probe the one pin, and then the other to a sufficient ground source. Do the same with the other pin as well. The resistance should be under 5 ohms, if not on either wire, then there is a short in the wiring and that will need to be repaired. The resistance of each wire between the ABS module and speed sensor plug can also be tested. Connecting the ABS module plug, the turn the key to the run position, but with the engine off. Using a sufficient ground source, one probe will be connected to that. And then the other probe will test each pin on the speed sensor plug.

Next is the removal and replacement of the sensor. Remove the electrical connector if you haven’t already. It’s fastened to a threaded stud and this may unscrew during the removal too early when removing the nut. To remove the nut, this requires a 13mm deep socket with a 3/8” drive ratchet.

Rotate the bracket for the brake line back. Next you’ll need a 14mm deep socket with the 3/8” drive ratchet to remove the threaded stud. Fully remove the stud. Make sure the surrounding area is clean so no dirt falls inside the differential. Then pull the sensor out. You may need to twist it to help assist it out of the hole.

Make sure the hole is clean and install the new sensor. There is an o-ring seal on the sensor to prevent any dirt or water from contaminating the oil. Try to avoid applying any lubricant so it doesn’t contaminate the differential oil. You can twist the sensor in to help seat the o-ring.

Install the threaded stud and tighten. Install the brake line bracket and install the 13mm nut and tighten. Finally reconnect the plug, push in the red clip. Once the sensor is working correctly, the code should erase itself and you’re done.

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