Here is some information that was passed on to me regarding the dreaded check engine light.   They are all in PDF format, and some are larger in size.

How to Proceed with Troubleshooting

Pre-Check

Diagnostic Trouble Code Chart (Look here to check what your trouble code is)

Parts Location

Fuel Pump Control Circuit

ECM Power source Circuit

Starter Signal Circuit

Customer Problem Analysis Check Sheet

Terminals of ECM

Problem Symptoms Table