Transmission Range (Tr) Sensor Description: Description

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

The PCM sends a voltage signal to the TR sensor. The TR sensor incorporates a series of step down resistors which act as a voltage divider. The PCM monitors this voltage which corresponds to the position of the selector lever (P,R,N,D,2,1).
The TR sensor is located on the top of the transaxle. The TR sensor also contains the neutral/start and backup light circuits.
This sensor also contains contacts for the gear position display in the instrument cluster.

Fig 1: Transmission Range Sensor Connector View

Courtesy of MAZDA MOTORS CORP.