Book excerpt: With the ever increasing electronic content in today's vehicles, the need to be able to read automotive wiring diagrams is as important as knowing how to use the different equipments needed to perform diagnostic work. Reading wiring diagrams requires a bit of knowledge of electricity and experience. By knowing the laws and rules that govern electron flow, you can become very proficient at this endeavor. Feel free to play the DVD that compliments this book and referring back to it so that you can absorb all the information. Good luck and enjoy. About the Author Mandy Concepcion has worked in the automotive field for over 21 years. He holds a Degree in Applied Electronics Engineering as well as an ASE Master & L1 certification. For the past 16 years he has been exclusively involved in the diagnosis of all the different electronic systems found in today's vehicles. It is here where he draws extensive practical knowledge from his experience and hopes to convey it in his books. Mandy also designs and builds his own diagnostic equipment, DVD-Videos and repair software. Table of Content Section-1 How Fuel Injectors Work Inside a fuel injector Amount of fuel supplied to the engine PEAK-and-HOLD Injector Electronic Modules and Controllers CAN and LIN Network Systems Basics Modules that Control Entire Systems Difference between current path and data path The oscilloscope or GMM (Graphing Multi Meter) Section 2 Unified Diagnostic Strategy Power Window Circuit Power Door Locks Cooling Fan Circuit Horn Circuits Cruise Control Systems Cooling Fan Circuit