Range Selection: Notes
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) receives range selector position by monitoring 3 independent voltage signals from the transmission range (TR) sensor. The TR voltages are then compared to an allowed voltage range for each gear.