Here is a detailed video on how different EGR Systems work and how you can test, diagnose and fix different issues within these systems.
If you liked this video you may find these other videos helpful as well:
How to test an alternator: http://youtu.be/5DdCNzge_s0
How to Test a Car Battery: http://youtu.be/Km6MNRYeEEY
How to Find a Parasitic Draw: http://youtu.be/eXX8TfzRAKk
How to Replace an Alternator: http://youtu.be/VaquYn944aU
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