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If you want to get a serious understanding of the innards of your vehicle and plan to to the maintenance on it over the long term, invest in the Factory service manuals.

This is especially so if you want to develop an understanding of the Onboard Diagnostic Generation II computer system that runs your engine, transmission, cruise control, security system, etc..

Much of the technical data for this article I wrote came from the FSM.. Look at the article and judge for yourself.. Also this one..

The FSM consists of Volume 1 and Volume 2 which together are about 5 - 6" thick... Lots of information..

You can also learn a lot from the articles on 4x4wire and the forums