I followed the instructions step-by-step to check the ignition timing
in my 1997 Civic LX. It was maybe 1/2 degree out of spec, I set it
where it should be.

Now, I want to know why you should jumper that service check connector
when you do this? what happens if you don't jumper this connector?

BTW: I could not locate the other connector (the 3-pin connector for
data). I found where it should go in that rubber thing, but I cannot
find the connector and the wires. Maybe 97 doesn't have one?

next thing I want to check is the PCV, but I cannot identify the valve,
even though I have some "diagrams" I am probably looking at it, but I
cannot "see" it