I initially put this in the Definitive list of AHC maintenance items thread, but at almost 800 posts long and growing, it's going to get buried and the thread itself is very unwieldy.
In an attempt to make as focused a summary as possible, I...
Here are some of the factory documents that may help along the way. Best to check in these first if you have questions about more details from the outline in post #1.
PM me if you have anything more to add here.
Just as an update to my post 3 years ago, If you're looking to buy a used Snap On MT2500 scanner try and find it with the last generation of programmable troubleshooter cards. Snap on Came out with these cards sometime in the early 2000's, and...