For courses in Engine Performance and Drivability, Computerized Engine Controls, Automotive Computers, and Automotive Fuel Emissions–in automotive departments of vocational and trade schools as well as community colleges. Based on the premise that simple problems should always be checked first, this practical, hands-on book introduces the diagnosis and troubleshooting of automotive engine control systems. It serves students as a single source for information on digital storage oscilloscopes, fuel injection and ignition system diagnoses, five-gas exhaust analysis, emission testing, and more–with a very technical but easy-to-read and understand presentation. This edition has been updated to include even more detailed scope (DSO) and current ramping tests plus extensive scan tool diagnosis