This module begins with a clear explanation about the why and how of electronic engine management systems. From there you will learn about the operation of various input and output devices and how to test them. You will also discover how the computer interprets various input signals when you read about the function of pull-up and pull-down circuits. Along the way there will be information on fuel pressure and volume testing, injector diagnosis, idle speed management, and an introduction to the OBD II compliant EEC V system from Ford.