Grand AM L4-138 2.3L DOHC VIN D MFI (1994)
Throttle Position Sensor: Description and Operation
Throttle Position Sensor (TPS)
Throttle Position Sensor (TPS)
PURPOSE
The Throttle Position (TP) Sensor is a non-adjustable potentiometer that senses throttle angle and relays the information to the PCM. This input to the
PCM is used to control the fuel system and most of the PCM outputs.
LOCATION
Side of throttle body opposite of throttle lever.
OPERATION
The TP sensor has internally three circuits. One to ground, the other from the PCM as a 5.0 volt reference source and a third circuit is used by the
PCM to measure the output voltage . As the throttle angle changes (pressing down on accelerator pedal) the TP voltage output varies from about .5
volt at idle to about 4.9 volts at wide open throttle (WOT).
