Audi P0638, PWM/Duty cycle explained
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- เผยแพร่เมื่อ 14 ก.ค. 2018
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In this video i diagnose a Audi Q5 v6 3.0Tdi with a P0638 code.
I explain why a diesel engine needs a throttle valve in the first place!
And we get to learn more about Pwm and Duty cycle.
Pwm/Duty cycle driver tool available at; www.ryansautomotive.ie
I Hope you enjoy the video!
DiagnoseDan fixed it again, see you next time guys! - ยานยนต์และพาหนะ
Fantastic video as usual Dan!
South Main Auto Repair, Thanks Eric😉
In my opinion Dan you have a great way of breaking things down into layman's terms. It makes your videos very enjoyable.
That was more than amazing your explanation is the best..please make more videos diagnosing problems and teaching how different sensors work and how to check them and how the different systems work like stop and start, anti-theft,etc and I have a question..I live in France and I saw a lot of Renault cars have throttle plate in the exhaust just before the silencer I wonder what is it for..
Ahmed Sharif That throttle plate can increase the exhaust back pressure. That way the exhaust gas pressure in the Egr gets higher for better Egr performance!
DiagnoseDan thanks for answering my question...I just noticed that my comment is in the wrong place
I am a master technician here at the Jersey shore, USA. I enjoy watching your videos as I use them as refresher courses for myself. Having been in the industry 40 years you tend to forget things you don’t utilize on a day today basis. Thank you for what you do. Keep up the good work. Have you ever thought about bringing your show on the road?
Can we have your backstory. How you got started, what exactly you do, did you go to school, tour of your shop, etc. awesome videos. Thanks for the time and knowledge!!
Paul Oneel, I will certainly do that one day👍
Great videos indescribable a lot of knowledge about auto diagnoses
this guy should really appears in automotive textbook. he is so good at teaching
some day I hope to graduate from Diagnose Dan TH-cam University.
And that day all the credit will be yours Dan. Bless you.
😂😂Thanks
These are the best videos on TH-cam if you really want to no about automotive electronics
John Green Thanks that is a great comment!😁👍
I agree.He sure has a great gift, I love that BMW with the shorted door handle and how it shut down the car!!! Dan is AMAZING
That was great. I'm an electronics engineer and computer scientist and have even built RC Airplane with (PWM) servos and controlled them with microcontrollers, etc., so I understand PWM just fine, but it was super helpful to see the tools you use on a car to figure out what's actually going on. Also your PWM explanation was really clear.
Sir you are Johan Cruyff of diagnostics you are one of the best teacher your teaching technique are so amazing and simple that even person like me which i am not very smart can understand.
You do know that Johan is dead don't you😂😂
you not only a good technician , you also have a good sense of humor too. @20.51. made me lough .thanks.
USA here, you are a great teacher. Please keep the videos coming. They are among the very best on the net. Thank you
Thank you for the great comment Joe it's appreciated!👍
At 1st I was a little annoyed how you over explained PWM & Duty Cycle, but as you continued I realized that you are giving "real world" explicit instruction. I have subscribed to your channel. Thank you!
Varian Styles You've got to understand not all viewers are on the same level. Sometimes I'm repeating myself, but that's the way people remember best.
Techs are Visual learners so i try to use real examples. Thanks for Subscribing !
Dear Dan, thank you so much for your videos. They are phenomenal and you are the best teacher I have come across in my life - believe me I have had many. I myself used to teach math and physics to high school students years ago and knew I was not a good teacher, but did not know why. I quit after five years of teaching. I liked tinkering with machines, love cars, had a degree in EE and fixing stuff is rewarding, so I decided to become a car mechanic. Watching you present your "lessons" really opens my eyes to better see what I lacked as a teacher. It is what you abundantly have - good understanding, broad knowledge, apparently a lot of experience, good teachers who taught you well, and a gift to communicate humbly what you know and do best. That gift is extremely rare! I hope you and your family stay in good health, your business thrives, and you continue to teach us. We are all eyes and ears-:). God bless you!
Wow that's a great compliment Michael, it's appreciated and thanks for watching my video's!😊
Really really impressed by these videos Dan. Have been in the motor trade for many years, have been on many courses over that time and I really don’t think I have experienced the simplicity of how you explain how automotive systems work before! Really grateful for these videos. Please keep them coming. I’m sure great things will come for you. Very good work.
Thanks Alister, i'm just trying to keep things simple. Life is complicated enough as it is!😉
Great TH-cam name 👍
This is just a phenomenal introduction into PWM. Thank you!
I gotta say, you are an excellent teacher. Just when I think you might skip something, and lose me, you go right to the next question in my head. Thank you
Ha ha i can read your mind🤣🤣
Awesome video, after many years ,now I understand it
Really? That's awsome!
There is absolutely no doubt in my mind that if anyone wants to understand basic electronics this is the channel to go to.
Thanks!😊
Who needs college when you’ve got DiagnoseDan..
Another clear and concise diagnosis. Spot on.👍
wardybasher Ha Ha 👨🎓💪👍
These is worthy of a automotive/ science class..
A gentleman named Paul wants your background. Me too!! This video was flippin amazing!! Seeing the part respond first to your rudimentary on/off, and then the fancy Dan machine was really cool. Super and I will watch then rewatch then recommend to others!!
Bill Rimmer Wow thanks Bill! I'll do a more personal video for sure!
Greetings from Portugal. Leon (bodgit and leggit) was not lying... You Sir are a genius. I love the detailed explanations. Thanks.
Sabino Berenguer Berenguer Ha ha ha my wife thinks I'm a dumbass 🤣🤣🤣 Thanks for watching and the nice comment. I'll Thank Leon for sending you over👍
Thanks Dan you are amazing, after watching ur videos now I can fix my car by myself.
Getting the basics right from the start, such as the function of the throttle body on a diesel engine, has serious implications down the line where correct diagnosis is concerned. Pwm is given the complete teardown with some very interesting practical applications, demonstrated. The advantage of using a scope from this and other videos, cannot be overstated. Very informative video and so well presented.
Tom OConnor Wow! Thanks for the great comment!👍
i love how you take time to explain every thing in details.
Good evening all i am audi & vw master technician since 2014 South Africa,i am enjoying Diagnostic Dan, its refreshing all we ve done before.I have my own workshop now. Audwagen Springs in South Africa.Keep up the good work.
Thanks!
Dan, I do really appreciate your professional and detail explaining of everything in each video. THANKS!!
Excellent explanation even for me, a electronic technician with 45 years of experience.
I think one thumb up is not enough at all, you deserve more.....thanks
Thanks Tarek😊
You are a perfect teacher...carry on the perfect job...cheers from portugal
ricardo mendes Thanks!👍
The smoke in an IC is the secret to why they work and when you let the smoke out of an IC it stops working. As this IC has burnt a hole in it letting it's secret smoke out it stopped working the valve body. LOL. Another great video Dan. Years ago only a electronics techs worked with this type of equipment. Now days that skill is being lost in that field as everything in that area is board replaceable and nobody trouble shoots to component level anymore. But in the automotive world now the auto techs must know more that the electronic techs of today. Funny how things change.
Very clear explanation along with detailed. I'm loving the videos.
That's great to hear!
THE BEST video I've ever seen on this subject. Absolutely awesome!
Kevin Lewis Wow Thanks!😁
Nice belt professor! 🙂 Another great video! You make it so easy to understand, you've got a real talent! Thank you so much for the videos,I wish you'd post more often but I'll take whatever I can get! 👍👍👍👍👍👍👍👍
Nick Nicu Thanks!👍👍👍👍
Hello Dan! While diagnosing a vehicle you teach us about very useful information and theories related to those components. I appreciate your work. Good luck
Thank you! I learned something new. I knew 2 of the reasons why a modern diesel has a throttle body but the one about smoother shut-down was new to me. Great video.
You are very good at what you do and very easy to understand when explaining. Thank you for your great videos
It is incredible how you simplify all of these. Thanks a lot.
brane pecenica Nothing is complicated, if you know how it Works!😁
Like your sense of humor and you’re a genius Ness
I've just found your TH-cam channel and it's really helping me out as I'm an apprentice who struggles with his electrical diagnosis! Great content.
I would appreciate it because you are a good professional, it is difficult for me to translate with Google 👍🇪🇸
talleresmoyano moyano, Gracias por ver mi video!😁👍
I like how you explain things clearly, thanks Dan
Thank you Steven👍
Thank you Dan for such an informative video, I can only hope that most mechanics are using these methods
@ 3:40 , reason number 4: If the turbocharger shits itself and spews oil into the inlet manifold the throttle body can close and so prevent the engine from running away and self-destructing. Thank you Dan, excellent video, well explained, big thumbs up!
Thanks for the feedback! You are right!
Wow PWM signal. I like the way you explain and simplify the Pulse width Modulation signal and the duty cycle
The lesson is clear like water Thanks Dan
I want to Thank You, your videos have helped this “Old Timer” learn the new stuff and stay relevant. I started out in the mid 70s and tried (unsuccessfully) to retire in 2112. I never learned to use a scope and I got by ok but due to my kids college I’m having to get back in the game as a mobile diagnostic and A/C Tech, I’m going to be rolling in about a week and a half and I’m nervous as hell but your videos are really helping me get up to date. Thank You so much!
The old videos are my favorite 😂
You are a great mechanic and a excellent teacher learn a lot from you keep up the good work
Wow, it is an excellent video for complete learning of the nature of PWM signal. Thanks indeed,sir.
Dan, you are amazing! There’s just one thing I don’t understand and that is, why does anyone ever give your videos a thumbs down! Thanks for sharing your vast knowledge with us, I wish I could come and work alongside you!
it's called being a 'retard' or maybe trolls from another platform who cannot stand someone with integrity,that they feel compelled to drag Dan into the gutter, Fat chance of that happening to be Honest!! there is an old saying; 'YOU CANNOT KEEP A GOOD MAN DOWN' keep up the great work Dan, we all appreciate you, LEGEND 😇
You did it again Dan! Thanks for the PWM class, you're a great teacher.
Moving Up Auto Diagnostics Thanks it's appreciated!😁
DiagnoseDan One question: PWM according to your explanation, what varies is the on time (duty cycle). So no matter the setting, the frequency stays the same. How do you call when the frequency actually changes? Like for example a GM MAF sensor. Thanks.
Been watching your videos for about a year, and I must say a big big thank you to you for taking time out of your day to fully explain your thaught process, diagnosis and fixing. Your method of passing on your wealth of expertise to us is amazing.i have learned so much from watching your videos.
They always say everyday is a school day ,
Once again a big thank you to you personally Dan , you are a wonderful teacher. And an amazing man with a wealth of knowledge.
Thanks for the nice comment it's appreciated
Amazing explanation for throttle body in diesel engine, great Dan!
Wow, PWM, amazingly simple yet so effective, thank you. This explains a-lot to me!
Dan your videos and teaching technique are awesome! Thanks for taking time to make the videos!
Thanks!👍👍
just discovered your channel , briliantly done ,learnt so much just watching a few of your vids . thankyou for your time .
Thanks George👍
All your video's are great training aids and can always get useful information to learn and grown
That's a great comment! Thanks!👍
Why does one need tech school when there is DiagnoseDan. Great video. Thumbs up.
Now that I am working on these European gems more often, I am reviewing some great videos from guy's who work on them on the regular!
Learning from a superb instructor 😉👍👍👍
Great work, DD - just shows that many shops don't have the skills base when it comes to fault tracing wiring runs. 👍🏻
This is the best explanation I've every heard. You would make an excellent teacher.
Thanks👍
Diagnose Dan FIXED IT again.
Great explanation. Thanks.
Thanks for watching!
Great video again Dan! Very interesting explanation of the PWM signal. I know i have PWM fans in my computer but i have never understood what it really means. You are awesome Dan! Thanks alot.
Amazingly informative presentation. Thanks for posting this Dan.
Luv diagnosedan. I'm learning auto repair and electrical engineering at the same time! Thanks Dan!
Thanks dan...once again you put accross an easy to understand lesson...
shauns auto repairs thank you!👍
Thanks for your effort in making this tutorial. I appreciate the detailed explanation.
A very thorough explanation, indeed! Thank you, Sir!!
roadkill5333 Thanks for watching my video's! 👍
Great example of PWM & duty cycle Dan 👍
Simply Diagnostics Thanks Steve!👍
You sir are a very talented and smart. I learn a lot with your videos. Thank you so much.
DAN HOW GOOD YOU ARE TO MAKE DIAGNOSIS SO EASY RESPECT !!!!!!!!!!!!!!!!!! TO YOU
I was just looking yesterday to see if my notification bell was broken. Because I haven't seen a new video in a few weeks...only to be surprised this morning. YAY..
Thanks Dan, apparently you fixed my bell again. (:
Cheers
exmotorsports 🤣🤣🤣🔔🔔🔔🔧
Thanks Dan, I finally understand PWM now.
Awesome video. Thanks for sharing your knowledge with us. So far your the smartest tech I have seen on the internet when it comes to auto diagnostic. Craving for more videos everyday. Thanks
A1 Mechanical Oakey Thats a great compliment sir!😁
You are soooooo good! I learn so much from you! Thank you!
👍👍 well done again Dan you need to be teaching the next generation!!
Adam King I'm trying!😉 Since they are on computers 24/7 TH-cam seems to be the way to go😁
Love your content and your ways of demonstrating
Thanks for your videos /diagnos classes !!! I have learned a lot ! Keep them coming.
No problem!
this video also explains how an RC car steering works. the degree of the steering angle is controlled by duty cycles open and closed loops ratio. very good explanation man! thank you very much.
I have trouble understanding 'electricktrickery' stuff but that was spot on, Dan....Now ....I'm off to change a bulb or two!!
Malcolm Young 🤣🤣🤣🤣 Good luck!
Great video dan, I think alot of techs in the industry need to know about pulse width signals as most of the components in cars are using them; you have very good way of explaining things.
Steve Sorits Thank you so much!😁
He can make ppl understand both theory of relativity and quantum mechanics within 10 mins just standing there in his workshop, he is brilliant , i love his supercool style.
Awesome, informative and funny all at the same time, thanks Dan. You fixed again. ✌🏼 cheers from Austin Texas. USA
Juan Serrano Thanks cowboy🤠🤠🤣🤣
You are a very good teacher. Really! You are good at it! Thanks
Great job Dan!
michael loeffler Thanks!👍
The best explanation i have ever seen thank Dan
I wish you could be cloned so every workshop would be populated vy your copy :) Awesome videos! I think you should open a diagnostics school.
Ha ha clone me🤣🤣
You don’t find many people who are as capable as dan. I would like to know where he is working.
I have been laughing how many BMWs seem to be having awkward problems, that others can’t fix. Then you go ahead and show what has gone wrong with ease.
Dan you or the best in what you do and the way you explain the problem and to solve it
great explanation with huge depth of knowledge , i have changed many of them but not known how exactly they work .
Soran Ghafour Now you know👍
Learning everyday,that's super delicious 😋. Thanks Dan. My best channel everyday!
Great Video. If you have a volt meter on something and your getting like 8 volts, don't assume you have a voltage drop. Flip the volt meter to duty / Hertz and verify it's not under PCM control. Communication is giving and receiving but a signal is an output to a transistor that acts as a high speed relay. That's how I learned it from scanner Danner. Lol
Super video Dan! And thanks for all of your videos.
hammer head Thanks for the comment it's appreciated!
Great video dan. You are one of the best channels on yt. Keep up the good work!
Oz Mechanics Thank you for the great comment buddy it's appreciated!😀
Great video Dan. Looking forward to learning more. Thanks a million.
And Thank you for watching!
I have a 2.0 golf with the same code. This has helped immensely, thanks!
Thanks Dan. Very educational work by you.
Wow this dude is amazing, ur a bank of knowledge.
Your explanations are so thorough! aloha Again!
Thanks Dan,very intuitive,appreciated.
Thanks for your back to basics teaching and great demonstrations 🏆 🍎