Astro Van L AWD V6-262 4.3L VIN Z (1994)
Throttle Position Sensor: Description and Operation
Throttle Position Sensor (TPS) Circuit
NOTE: Because different models and engine applications vary in wire colors, circuit numbers, and pin numbers, the above image is a typical example.
Refer to COMPUTERS AND CONTROL SYSTEMS/SCHEMATIC AND ROUTING DIAGRAMS for specific schematic applications.
PURPOSE:
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.
