Fuel Tank Pressure Sensor.
Anybody ever have to change one of these? I was looking at Alldata'* 2003 Bonneville freeby instructions and it says their is an access door in the rear compartment. They mean the trunk floor right? They also say I need to have 5 volts at the connector. I borrowed my neighbor'* volt meter and I'm going to see what I get. He said I should have 5 volts at the grey & black wire and to back probe the third wire for 2.5 volts.
Question: How do you back probe a connector?
Edit: Ok I did some checking; apparently it is a 3-pin sensor with the mating 3-port connector.
Port A = low voltage reference
Port B = signal voltage of 0.1V to 4.9V (Depending on tank pressure)
Port C = 5 volt reference from the PCM
Question: Should I have 5 volts between A and C ?
Question: The back probe check is for the signal voltage out of Port B right? And you would do this with the sensor connected to the connector right?