This book was written based on a strategic approach to understanding and diagnosing computerized vehicles. It covers ECM power and ground feeds, input sensors, output controls and system strategies. Theory in each area is enhanced with many Tech Tips which I have accumulated in my diagnostic travels over the past years diagnosing “Real World” problems found in the field. This book includes about 67 digital images and 49 test procedures captured in the field. Along with 50 computer drawn theory slides and 142 pages of test, this book has close to 1500 hours invested in it. The amount of information in this book can only enhance what you already know and help resolve some cars that may have similar failure patterns in your shop. If it can help resolve ONE car then this book has paid for itself.