No I don't have any of those meters. But after reading your post and thinking some more I went back out and started following the wires again. What I had not done before was unplug the harnesses (?) (there are a group of 3 harness pairs just before the PCM). I blew into them and pluged them back together. Didn't really look like any dirt in there and because they all had looked fairly clean and secure I never took them apart before.
Well I start the car and the fan doesn't go on within a minute. Fan doesn't go on and the gauge actually moves more slowly up to the middle area where it normally resides.
I took the negative off the battery, waited a minute and put it back on. And the check engine light after driving has been off, it has not come on after driving around, stopping and restarting.
So I think that has done it. Amazing the mechanic told me the PCM needed to be remapped or flashed because he changed out the Oxygen Sensors and the ECT and the codes didn't go away. He said the PCM got used to new parameters.
Ford Dealer as I said wanted to run for 3 hours and had a different opinion.
I found out the Oxygen Sensors were missing Fuse #13 the 20 amp fuse in the box. That solved that. And now if this fixes the ECT it seems like the obvious is ignored?
Mechanic swore the sensors were bad, it made sense because the person I bought the car from had put in a new engine when the old one seized and never tried to get the check engine light off, So I figured he had ruined the oxygen sensors and the coolant sensor if the engine overheated.
