Reading Throttle Position Sensor Voltage
I have a GM throttle body that has a Throttle Position Sensor (TPS). In order to set the position of the throttle (at idle) you are supposed to read the voltage at 2 of the three pins. This sensor is basically a potentiometer. So, GM instruction are to pull the connector, turn the key on and read the voltage between the wiper (center) and the top pin.
I don't get it. If you remove the connector, you have removed the sensor entirely from any voltage any where. It's like measuring the sensor voltage if it was still in the box.
I gotta be missing something.
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