I was reading an excellent writeup regarding GM EFI troubleshooting at Troubleshooting pg. A

This page shows a pinout diagram with explanations of how to use each pin for diagnostics...
I was all ready to start doin some troubleshooting on my 91 caprice and.....
THE PINOUTS DONT MATCH THE DIAGRAM!!
I looked at two other ALDL-era chevies I have and NEITHER ONE of them match the diagram either!!
Does anybody have a link or know where to find out about the different pinout layouts? I know pin A is ground and jumpering B will result in a flash test, but I want to do some of the other tests, as well!
Thanks!