It is a three wire potentiometer circuit.
Pin 2 grey/red wire is sensor return to the PCM on pin 91 and shares that with the MAP, TPS and most of the other sensors.
Pin 1 white wire is the sensor signal feed to the PCM at Pin 8.
Pin 3 brown/white wire is the five volt reference signal from the PCM at pin 90 and shares that with the MAP, TPS, and the fuel tank pressure sensor.
Thursday, December 7th, 2017 AT 11:31 AM