Greg,
The Helm FSM has a page in the "Emissions & Drivability" section that has all the function values that a healthy system presents to the ECM. The numbers are taken at idle speed, in "closed loop" operation. When I did my scan I followed the manual's instructions and just reported (posted-up) the values I was seeing here and the members explained what the data ment.
You'll have to forgive my lack of knowledge! The last vette I had before this one had a holley & the only electronic parts on the car were the ignition system and the radio!
Tom