Obd Ii Functions Monitors And Diagnostic Techniques Pdf
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- Research on assessing knowledge level of mechanics on OBD
- [PDF Download] OBD-II: Functions Monitors and Diagnostic Techniques [PDF] Full Ebook
- A Study on Development of Engine Fault Diagnostic System
Research on assessing knowledge level of mechanics on OBD
Text Tracy Martin All photographs are from the authors collection unless noted otherwise. All rights reserved. With the exception of quoting brief passages for the purposes of review, no part of this publication may be reproduced without prior written permission from the Publisher.
The information in this book is true and complete to the best of our knowledge. All recommendations are made without any guarantee on the part of the author or Publisher, who also disclaims any liability incurred in connection with the use of this data or specific details. On the back cover: A wide variety of diagnostic brands and software are available. We recognize, further, that some words, model names, and designations mentioned herein are the property of the trademark holder.
We use them for identification purposes only. This is not an official publication. Motorbooks titles are also available at discounts in bulk quantity for industrial or sales-promotional use. To find out more about our books, visit us online at www. Automobiles--Maintenance and repair--Equipment and supplies. Automobiles--Motors--Computer control systems.
Automobiles--Pollution control devices. Automotive sensors. Automobiles--Defects--Code numbers. M Published by Motorbooks, Tracys latest book, Motorcycle Electrical Systems: Troubleshooting and Repair, is available at booksellers everywhere.
Tracy has presented riding skills and motorcycle suspension seminars across the United States and recently in England and the Russian Federation.
Contents Preface. Professional Scanners and Code Readers. Scan Tools. Automotive Detective Work. Scanner Operation. What seemed to be missing was a source of information that tied everything together. I wrote this book about scan tools and code readers in the same easy-to-read style as my first five books, both for automotive- and motorcycle-related subjects, to fill this information gap.
There are expanded sections in many of the chapters, especially in chapters four and five, where I cover updated and new scan tools and code readers. In this book, the first generation of on-board diagnostics OBD-I will be discussed in chapter one and chapter two will cover OBD-II, the diagnostic monitoring system in all vehicles sold in the United States since , and the system that code readers and scan tools interface with.
Also included is a brief history of automobile air pollution and how this problem has driven the automotive industry to produce these systems in the first place. Chapter three covers electronic fuel injection, oxygen sensors, and catalytic converter operation. Code readers are discussed in chapter four with scan tools following in chapter five. How an engine works, and especially how to separate engine mechanical problems from OBD-II system diagnostics, is discussed in chapter six, and chapter seven provides some practical applications for using a scan tool to diagnose emission-related problems.
This book will provide the reader with a sound understanding of how on-board diagnostics relate to engine performance and emission problems. However, because both OBD-I and OBD-II systems, on-board computersand their numerous sensors and componentsare electrical in nature, a basic understanding of automotive electricity will go a long way toward diagnosing and repairing problems with the vehicles that use these systems. My book How to Diagnose and Repair Automotive Electrical Systems, also published by Motorbooks, is the perfect companion book to this one.
Ive also written on the same subject for motorcycles, Motorcycle Electrical Systems Troubleshooting and Repair, also published by Motorbooks. You can find more information about these books and some background on myself on my website at: www. Send me an e-mail if you want to comment on any of the books I have written or just to say hello. I would like to thank the following individuals for helping me with research and information for this book.
Without their assistance, I would be lost more than I usually am. Curt Moore and Craig Healy from the S. Hotline; their technical editing and suggestions saved me from writing something stupid. Fisette Justin of the Bosch Automotive Aftermarket Division, who generously provided me with information and photographs on scan tools and code readers; and Elwoods Auto Exchange, where I was able to take many of the photos used in the book.
Darwin Holstrom, my editor at Motorbooks International, and my wife, Leslie, whose editing skills have always vastly improved what I write. So take a break from working under the hood of your car, sit back, relax, and read all about how scan tools, code readers, and your Android or Apple smart phone work with your car or trucks OBD-II on-board computer.
Hopefully youll find what this book contains is entertaining, as well as informative. Tracy Martin. His courage has been an inspiration to my wife and me as we watch him make it through each day of his treatment. Before his diagnosis, the term cancer survivor was only an. I know that he will emerge from this nightmare intact and ready to move on with his life. With all my love, Dad. For years, it seemed, vehicles, vehicle owners, and mechanics got along quite well without them. Where did the need for these tools arise, and do they really do anything, and more importantly, what jobs do they perform, and are they really necessary when repairing an automobile today?
If they are now an essential component of vehicle diagnostics and they are! These questions, and others like them, much like most peoples impressions of automotive scanners, code readers, and on-board diagnostic computers themselves, frequently leave automotive hobbyists and even some professional repair technicians perplexed and without a clue as to the right answers or what direction to take when it comes to high-tech auto repairs.
It is important when discussing automotive scanners, code readers, and on-board diagnostic systems to provide some background and a little history about the birth and development of these electronic devices. Then we can embark on an exploration of how they operate and what they do in a practical, hands-on manner, and how to use them to make repairs.
Lets start with the basicsa brief description of scanners, code readers, and the vehicle diagnostic computer systems with which they interface. Both scanners and code readers allow a user to receive and view information from a vehicles on-board engine management computer system. The difference between code readers and scanners is one of quantitative capability: code readers are very limited in the automotive diagnostic information they can provide, while scanners can provide the same information as a code reader, but.
Not a pretty sight of downtown Los Angeles in as smog obscures the view down this city street. The term smog was borrowed from the British, who originated the use of the word in as a contraction of the words smoke and fog. The first officially recognized gas attack of smog happened in Los Angeles in By contrast, onboard diagnostic engine management systems perform a number of tasks, including managing fuel-injection and ignition systems, shifting automatic transmissions, managing climate control systems, and controlling vehicle security, navigation, communication, lighting and other computer-related systems.
However, by far the most important function on-board computer systems perform in conjunction with the code readers and scanners that work with them and why these tools are the focus of this book is to monitor the performance of emission controls, components, and systems, and make the driver aware when vehicle exhaust is polluting the air. Scanners and code readers are technically only capable of reading the information on-board vehicle engine management computer systems generate.
We will cover the details about OBD-II systems in significantly greater depth as we continue with the remainder of this book, as our primary focus is on modern OBD-II computer diagnostic systems in use today. Later in the chapter, we will provide actual testing instructions for OBD-I diagnostics. OBD-II systems will be covered in the second chapter, electronic fuel injection and catalytic converters in the third chapter, code readers in the third chapter, and finally, scanners in the fourth chapter.
The remaining chapters deal with how electronic fuel injection and catalytic converters operate, how to perform basic automotive detective work on mechanical engine conditions, and the proper use of scan tools to diagnose OBD-II-related problems.
However, before we get into too much detail, it is appropriate at this point to provide a brief history lesson as well, as it will prove useful to understanding how automotive on-board computer systems, and the scan tools and code readers they interface with, came into being, and how and why they developed as they did. In order to clearly understand the evolution and development of diagnostic scan tools, it is useful to start in the s and work backwards in time.
All automotive scanners, code readers, and OBD-I and OBD-II systems were gradually developed for broad consumer use as a direct result of auto emissions problems from the past. Scan tools, like so much other s automotive and related technology, including electronic carburetors and fuel-injection systems, only came into being as a result of auto manufacturers being forced by Congress to clean up the exhaust emissions billowing from Americas tailpipes.
Manufacturers initial efforts to control auto pollution followed a band-aid approach, which proved to be unpredictable and unreliable, and in many cases, made the cars and trucks equipped with them undrivable as well. Manufacturers simply did not have compelling economic impetus or significant legislative arm-twisting to force them to develop the engineering technology to control automotive emissions in an effective or standardized manner.
As a result, and by. The on-board computer systems themselves actually monitor all of the engine emissions controls and systems during vehicle operation. Originally, on-board computer systems were designed into vehicles by various automobile manufacturers. Originally quite expensive, OBD-I systems were designed for use by professional technicians, and each operated uniquely.
The information and tests that OBD-I systems provided was not standardized among auto manufacturers, and frequently even varied within a single automakers model years or engine families.
The majority of the first wave of automotive scanners ever produced were manufactured in the United States around As originally designed, s scan tools for retrieving basic diagnostic information from OBD-I systems used various cables and adapters to plug into myriad types of data connectors found on automobiles that were often specific to vehicle year, make, and model.
This complexity made these tools expensive to ownmany costing thousands of dollars. In addition, they were designed for use only by professional automotive technicians. As a result, because of the cost and difficulty of use, consumers were largely unaware of their existence. In fact, many car and light truck owners at the time and subsequently, for years afterward did not even know their vehicle s were equipped with an on-board computer.
Around , the first code readers were sold in automotive parts stores, finally enabling consumers to tap into some of the information their automobiles had been generating and using for almost a decade.
However, it wasnt until that the automotive industrys exclusivity over vehicle on-board diagnostics changed significantly: stricter federal emissions regulations led to standardization of on-board diagnostic systems across manufacturers.
Thus, generation two of on-board diagnostics, or OBD-II, was born, and standardized, enabling aftermarket scanners and code readers to read any or later vehicles on-board computer information. As more and more consumers purchased these tools, and demand increased, the price naturally.
After much reluctant trial-and-error engineering, auto manufacturers discovered the only consistent and reliable means to effectively reduce automotive tailpipe emissions was to utilize computer systems and related technology that could address and deal with all the variables of engine performance. Once automotive engineers discovered and confirmed the viability and attractiveness of on-board computer systems as a means of controlling vehicular emissions, a new set of unanticipated problems emerged.
With the introduction of automotive on-board computers, technicians had to have a means of communicating with these devices. Early computer systems used a Check Engine light that simply blinked on or off; or in more sophisticated models, the on-board computer used the light to flash out diagnostic trouble codes specific code numbers assigned by manufacturers to specific malfunctions in the emissions control system.
With the necessary skills, a trained technician could read the trouble codes based on the sequence displayed by the flashing light on the instrument panel. Initially, the only computer scan tools available to interface with a vehicles onboard computer system were brand-specific tools that automakers provided exclusively to their own dealership network.
This was a great marketing toolonly new car dealerships were able to repair whatever went wrong with emission controls systems on their brand of cars and trucks.
Fortunately for the automotive aftermarket, and eventually for the rest of us, Congress declared this monopolistic practice to be illegal.
[PDF Download] OBD-II: Functions Monitors and Diagnostic Techniques [PDF] Full Ebook
This study implemented a mobile diagnosing system that provides user-centered interfaces for more precisely estimating and diagnosing engine conditions through communications with the self-developed ECU only for industrial CRDI engine use. The designed protocol consists of a message structure to request data transmission from a smartphone to ECU and a response message structure for ECU to send data to a smartphone. It transmits 31 pieces of engine condition information simultaneously and sends the trouble diagnostic code. Because the diagnostic system enables real-time communication through modules, the engine condition information can be checked at any time. Thus, because when troubles take place on the engine, users can check them right away, quick response and resolution are possible, and stable system management can be expected. The program and data parts of this ECU can be changed only by the manufacturer.
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A Study on Development of Engine Fault Diagnostic System
Jeep Obd Pinout. It has been popular to swap the PCM in place of the Compare to. Insane Audio includes a plug and play wiring harness so installation is a. I can get any wiring diagram since I subscribed to mopar's tech authority.
Using a diagnostic tool is literally as simple as plugging the device in and turning everything on. The trick is finding the right port and figuring out how to work the device. Diagnostic tools tend to be pretty similar in design and function.
This exciting new book combines coverage of OBD II design, its role in state emission testing failures, diagnosis and repair, and the setting of readiness monitors. It provides your students with a solid working knowledge of the purpose and functions of the OBD II by beginning with an overview of the technology and its role in on-the-job tasks. Using this as a foundation, the author then addresses more advanced topics, including the extremely high-powered diagnostic abilities involving the various scanner modes, as well as the hows and whys of setting readiness monitors.
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