Operation
The Throttle Position Sensor is different for the Automatic Transaxle (ATX) equipped vehicles than the Manual Transaxle (MTX) equipped vehicles. The MTX vehicle Throttle Position Sensor functions more like 2 switches (Throttle Full Close Switch and Throttle Full Open Switch) than a traditional sensor.
The above image is from Technical Service Bulletin (TSB) 9114B1 dated July 22, 1991.