Throttle Position Sensor (TPS)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1985 Ford Ranger, 1985 Ford RV Cutaway, 1985 Ford Pickup, 1985 Ford Econoline, and 1985 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
The TPS is mounted on side of throttle body and connected directly to throttle shaft. The TPS senses throttle movement and position and transmits an electrical signal to the ECA. These signals keep the ECA informed of wide open throttle, closed throttle, or normal cruise conditions.