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Automotive Diagnostic Systems: Understanding OBD-I & OBD-II (Workbench How-To), by Keith McCord
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Review
"A fascinating, informative and essential for those who really want to solve or at least understand diagnostic system problems, within their car." (TKC Mag 2012-01-01)Appears in "Top 21 Reading Materials for the Auto Enthusiast." (Andy Bolig Auto Enthusiast 2012-12-03)
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From the Back Cover
For more than 30 years, cars and trucks have carried onboard diagnostics (OBD), which monitor and adjust major systems, including engine, drivetrain, fuel, and more. Many think that repairing or tuning the current system (OBD- II) is a black art or a computer science, and that there is no way to diagnose and fix computer control-system problems at home with affordable tools. But, that is simply not true. OBD expert, tuner, and author Keith McCord explains system architecture, function, and operation. He shows you how to use a hand-held scanner, connect it to the port connector in the car, and interpret the data. But most importantly, he shows you a practical, analytical, and methodical process for tackling a problem, so you can quickly trace its actual source and fix the root cause and not just the symptom. Automotive Diagnostic Systems includes definitions of diagnostic trouble codes and a table of common DTCs. McCord reveals the intricacies of diagnosing the system, the importance of fixing component DTCs first, one- and two-trip codes, how the PCM erases DTCs, and how you can have DTCs stored in memory with no MIL on, among many other common issues. As a result, you learn how to resolve a range of common OBD-II problems, such as engine misfires, shorts and opens, out-of-tune fuel trims, dead catalysts, emissions leaks, low voltages, failed oxygen sensors, and much more. But it also covers fuel injectors, ignition systems, chassis sensors, and various other sensors and actuators.
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Product details
Series: Workbench How-To
Paperback: 144 pages
Publisher: CarTech (July 21, 2011)
Language: English
ISBN-10: 1934709069
ISBN-13: 978-1934709061
Product Dimensions:
8.5 x 0.4 x 11 inches
Shipping Weight: 1 pounds (View shipping rates and policies)
Average Customer Review:
4.2 out of 5 stars
96 customer reviews
Amazon Best Sellers Rank:
#251,790 in Books (See Top 100 in Books)
(Please note: Since reviewing this book, I have since purchased the Haynes Techbook, "ODB-II & Electronic Engine Management Systems". In my opinion, that book is infinitely better than the book reviewed here. There is simply no comparison. I am posting a review of that book.)I have mixed feelings about this book. I debated whether to give it three or four stars and decided to give it 3 ½ stars. I realize that I have more negative things to say about this book than positive, but I don't want to mislead anyone. The bottom line is that the book is good and worth the money but I have ordered another book that, hopefully, has more practical information. When you're done with this book, and if your attention span is good and you can identify errors and omissions in it, you may know more about the history of OBD, data transfer, protocols, etc., but you won't know much more about the practical use of a scanner. In fact, I never had a problem using my scanner to diagnose problems before but I am actually more confused about how to do that than I was before I read this book. Even so, it's a good resource and I recommend it for the background information it provides. It's simply not very good at helping the reader solve real-world problems.THE GOOD:The book has excellent graphics in bright colors on very white paper making it easy on the eyes.It covers the subject in depth but this is also a negative (see below).It was published in 2011 so it is more up-to-date that the most popular competing book by Haynes.THE NOT SO GOOD:The book has numerous errors, omissions, and repetitions. In fact, I had to mark the book up for future reference. I'll just give a couple examples or errors:On page 24 there is a side bar called, "Testing Voltage at the DLC for CAN-Based Vehicles." Oddly, the sidebar then goes on to describe a test for reading resistance across two data terminals. Then, at the very bottom, it says that if "no voltage" is found at either terminal, there is a problem with the power. But the test does not check for power at all and it isn't even done with power or ground terminals. Then the test description is repeated in the text two pages later.On page 66, it says that vacuum gauges and MAP sensors read the "opposite" and that when the value with one goes up, the other goes down and vise versa. But the example it gives shows them both rising and falling together.There are also references to tables that are not where they are said to be, etc, and mislabeled sidebars and sidebars that have no real relevance to the text or are indecipherable as shown.Another example is the calculations for horsepower starting on page 71 and going onto page 72. It is completely muddled up. The term "pounds" is used where "gallons" should be and visa versa repeatedly. If you scratched your head when you read it, it's not you!Those are just a couple examples but there are quite a few more. My book is marked all up with corrections. It appears that it was never proof-read at all.More seriously, the book spends too much time explaining the history of OBD, the various regulations, regulatory agencies, protocols, standards, etc. It even spends time talking about how computers transfer data and how parity bits and checksums are run and so on. I would think that the average person who buys this book just wants to know how a scanner works and the information you need to use it in practical situations but the book is mostly theory. There is very little in the book about actually using a scanner in real-world practical situations. In fact, if you eliminated all the background information that most people probably aren't interested in, the book would only be a handful of pages long not counting the DTC index at the back of the book. But you don't even need that! That information is readily available from many sources and in more up-to-date form. There is even a chapter on how a 4-stroke engine works which is a waste of space, in my opinion. If you don't know that, you probably don't plan on working on your car anyway and therefore probably aren't interested in this book. Besides, it has little to do with the subject of the book.I was also disappointed that, with the exception of a picture of an oxygen sensor, there are no pictures of any sensors and no mention of where they are located, etc. Of course, they aren't the same in all cars and they aren't located in the same locations in every car but it would be nice if pictures of the most common sensors were included and where they are generally located. (The Haynes book does that so it.) That's one of the things I really wanted the book to cover. There are only descriptions of the functions and theory of the most common sensors but there is nothing explaining where they are or what they look like, with the exception of oxygen sensors.In addition, the author tosses out acronyms without defining them at all. He seems to assume that the reader knows all the esoteric stuff that probably most professionals don't even know but anyone buying the book most likely doesn't know that stuff and that's why they bought the book in the first place. I had to do internet searches frequently to get a general idea of what he was talking about and, at first, I thought the book was missing a glossary. However, I found it later, 28 pages before the end of the book instead of at the back where it should logically be. But that glossary doesn't explain anything about what the acronyms actually mean. It just tells you what they stand for. For example, for IFR, it says only "In Frame Response" but doesn't say a word about what that actually means. It's the same for everything in the glossary. For most things in the glossary, you will have to do your own research but, if you do that, there is no reason to use the glossary in the book in the first place. So keep your computer nearby. In other words, the index is virtually useless. And the book doesn't have an index at all which is very important with a book of this type.The author gives a couple examples of diagnosing problems based on DTCs but the way he explains it will probably intimidate many readers into not wanting to actually fix problems they may have with their cars. For example, he will show some freeze frame data and point out that this or that piece of data is out of spec as it relates to some other piece of data but he doesn't explain what those parameters are or how he knows they are out of spec. He makes it clear that you simply have to know that stuff but the average backyard mechanic doesn't know that stuff. I've been doing all my work on my own cars since the late 60s and I don't know that stuff and much of it is so esoteric that I won't remember it the next time I use a scanner anyway. He basically implies that you have to be an automotive genius and know everything about how every system interrelates. Not encouraging! However, there are resources that will give you flow charts on how to diagnose DTCs. I always buy a factory service manual for my cars and they have the trouble shooting flow charts in them but you can find it on the internet or in other books. I think the author would have been better off to simply tell the reader to get a shop service manual or find a similar resource for trouble shooting information and not assume that the reader knows exactly what an IAT sensor is and what output it should have or what the trim spec should be, let alone what it is.However, I'm still glad that I purchased the book. I just hope the Haynes manual has more practical information. I did see in some sample pages of that book that it has pictures of the actual sensors and shows where they are. That's the type of information I need. I don't need to know the history of all the regulatory agencies and all their protocols, etc.
If you are curious about how OBDII actually works, this book will help you understand it. Extremely detailed description of the history, and process of how OBDII works.However. if you want to know what a certain default code is and what component you should replace on your specific car this book will NOT tell you that. Rather the underlying concept of how a sensor sent a signal to an ECM, that in turn illuminated the check engine light.Similar to other tuning books (carburetors, transmissions, brakes, etc..) this theory book will help you gain experience faster. But it will not replace turning wrenches in the garage.
I thought this book would be a very basic book explaining DTC's. It is much more than that! It covers function, operation and troubleshooting of all sensors in OBDII & OBD1 sysytems. Open loop and closed loop function, and how the PCM reacts to a change in a sensor's output. A VERY useful book to go along with other advanced tuning books. I know some tuning books may contain terminology or information that does not make much sense, but this book will certainly make the advanced books much more clear.
ITS A BOOK YOU SHOULD READ, EVEN IF YOU USE A SCANNER EVERY DAY,READ IT, MAKES YOU UNDERSTAND MORE.AS DESCRIBED,GOOD QUALITYBest Regards,Jimmy WongVIP AUTO NYCBROOKLYN, NY, 11220347-987-3872
If you ever intend to use even once any kind of automotive diagnostic equipment yourself (to use OBD tester) you must HAVE and read this book, even if you aren't a novice. Very helpful!
This book did help me to surmise my code had to do with the exhaust system and that there would likely be no symptoms other than my check engine light. However, it did not tell me exactly what I needed to do to fix the problem. I found that on the internet. So, unless you want an inner understanding of how the codes are triggered and how to troubleshoot, I found, at least for my specific code, the book was of little help to me.
Read the whole book. It's was Ok but not what I expected, not in depth enough
The reason I give this diagnostic instrument 4 stars and not five is because the add showed a case (pouch) that was not included with the package when delivered. I was very disapointed because after that, the add was changed and the pouch was removed. So when I called Amazon to inquire about the pouch, I was informed that the add does not show a pouch. Well this was not professional. The add was changed after the package was delivered , received and used. Someone , either the manufacturer or Amaxon must provide all the items included in the add. The device alone is worth 5 stars because it worked very well. I used it twice and gave me the proper codes and and whst they stand for. I was able to do the repair myself. Now, I keep this device in my vehicle at all times.
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