Dan, if you are serious about keeping your rig and interested in learning a bout the control systems, check out:
www.autoenginuity.com
Very user friendly and complete.
I also bought a Powerstroke Systems book, but forgot the name of the company selling it.
If you call Jay at Autoenginuity, he can tell you where to get the book.
The book explains most of the systems and devises present on your rig and then gives the static and running parameters.
SO, when a code is set, you read the code, go to the book which explains in detail which system is involved, all of the sensors related to and devises controled by.
Back to the program that you can read in real time and monitor those areas. BINGO!
Very happy with this product. /ubbthreads/images/graemlins/smokin.gif