The variable speed sensor (VSS) in your Explorer monitors the revolutions of the transmission. The VSS collects this information and sends it to your Explorer’s power control module (PCM). Your PCM uses the information to determine how fast the truck is moving to effectively adjust the transmissions shifting patterns. When the variable speed sensor is defective, it sends erroneous information, which can lead to problems with your transmission. You can locate the variable speed sensor in the 1997 Explorer within 10 minutes. Replacing it, if needed, does not require disassembling the engine and should take about 25 minutes.
Turn off the Explorer engine, and remove the ignition key. Apply your emergency brake.
Raise the passenger's side of your Explorer with a hydraulic jack positioned at the rear of the front tire. Place a jack stand under the frame rail for extra support.
Slide under your Explorer directly in line with the side view mirrors.
Locate the vehicle speed sensor on the side of your Explorer’s transmission. The VSS has one bolt holding it in place and has a bundle of wires connected to it. The sensor resembles a spark plug. To remove the switch, unplug it, remove its bolt with a socket wrench and pull it away from the transmission.
