Currently the fuse in blown in my Fluke, so I won't be able to take that amperage reading in the nearest future (have to order over the internet). Is a MOSFET not pratical for this application?
Still working on R1, I do not have the car on hand right now.
V2 is constant. Just like with a MAF sensor having a constant 5vdc and the return to the ECM is the variable, this particular circuit does not have a return to the ECM, its a 1vdc signal from the ECM to ground, in that path is the sensor that has variable resistance dependent of air fuel ratio. So within the ECM there must be a bias resistor for it to read across to figure out the resistance of the sensor, and thus the a/f. I'm not sure if that bias resistor's value is pertinent or not, I'd really like not having to calculate it via readings.