Greg
Looks like your making progress
About the cel
Just cause you got a Tweecer and have set that scalar to a 0.0 value doesn't mean you can't get a cel.
I feed my wb's output through the egr pcm input so the af ratio shows up in my datalogs. I've had the pcm throw me a cel 2 or 3 times over the past couple of years. The code is about egr output not what the pcm expects to see or something like that. The wb output must not quite match the egr output every once and a while. Its no biggy to me but it does show that we can still get a cel.
Its been so long since I ran some of those codes I don't remember the exact procedure. You jump a couple of wires in that diagnostic thingy by the passenger shock tower and turn the key on and count the number of times the cel flashes or something kinda like that......Sorry I just don't remember.
If someone does not give more accurate info its on this site or the Corral I think.
You can check em with a code scanner as well if you can get ahold of one.
Again, glad to see your getting things sorted out
Later
Grady