This link is to Steve Brotherton's website for Continental Imports. He has written some really good articles. The articles have some explanation of basic operation and then go on to explain know problems and repairs regarding different model and year range MBZ's. Check it out.

http://www.continentalimports.com/ser_art.html

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Mercedes-Benz Driveability
Evaluating Electronic Engine Controls
by Steve Brotherton, Import Specialist
Published in: ImportCar∞, February 2001
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Steve Brotherton is co-owner of Continental Imports∞, a 22-bay shop in Gainesville, FL, that employs 18 people, 10 of whom are technicians. A Bosch Authorized Service Center since 1986, the shop specializes in Mercedes-Benz, BMW, Porsche, Volvo, Saab, Jaguar, Honda and Acura. Brotherton has been an ASE-certified Master Technician since 1973 and is a recertified L1 specialist. In addition, he is a Bosch Certified Master Tech, president of the Alachua County ASA Chapter and member of the board for Florida ASA. He holds a bachelors degree in Metallurgical Engineering from the University of Florida. Steve is also a regular contributor to MercedesShop's Shop Forum and currently moderates the Tech's Only forum.