Astro Van M V6-262 4.3L VIN B TBI (1991)
Throttle Position Sensor: Description and Operation
Throttle Position Sensor
The Throttle Position Sensor (TPS) is connected to the throttle valve shaft in the throttle body unit. The TPS is a potentiometer with one connection to
ground, and the other to the computer 5 volt reference source. A third wire from the computer is used to measure the output voltage from the TPS. As the
throttle angle changes (pressing down on accelerator pedal) so does the TPS voltage output. By monitoring TPS voltage output, the computer can
determine fuel delivery rate based on throttle valve angle or driver demand.
