Digital Transmission Range (TR) Sensor
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
The digital transmission range (TR) sensor is located on the outside of the transaxle (toward the front of the vehicle) at the manual lever. The digital sensor completes the start circuit in PARK and NEUTRAL, and the back-up lamp circuit in Reverse. The digital TR sensor also opens/closes a set of switches that are monitored by the TCM to determine the position of the manual lever.