Audi P0638, PWM/Duty cycle explained

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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!

[@SouthMainAuto]

Fantastic video as usual Dan!

[@Diagnosedan]

South Main Auto Repair, Thanks Eric😉

[@SouthMainAuto]

In my opinion Dan you have a great way of breaking things down into layman's terms. It makes your videos very enjoyable.

[@ahmedsharif2074]

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..

[@Diagnosedan]

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!

[@ahmedsharif2074]

DiagnoseDan thanks for answering my question...I just noticed that my comment is in the wrong place

[@johnjohannemann1220]

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?

[@user-qw8wg5sk3l]

this guy should really appears in automotive textbook. he is so good at teaching

[@knocksensor3203]

These is worthy of a automotive/ science class..

[@peterschaldemose7861]

This is just a phenomenal introduction into PWM. Thank you!

[@alibatebi2161]

you not only a good technician , you also have a good sense of humor too. @20.51. made me lough .thanks.

[@DennisGentry]

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.

[@jaejedd]

some day I hope to graduate from Diagnose Dan KZbin University. And that day all the credit will be yours Dan. Bless you.

[@Diagnosedan]

😂😂Thanks

[@ogaremmanuel4032]

i love how you take time to explain every thing in details.

[@TTaha-lj1fx]

Dan, I do really appreciate your professional and detail explaining of everything in each video. THANKS!!

[@joemikos900]

USA here, you are a great teacher. Please keep the videos coming. They are among the very best on the net. Thank you

[@Diagnosedan]

Thank you for the great comment Joe it's appreciated!👍

[@fixingstuff1253]

These are the best videos on KZbin if you really want to no about automotive electronics

[@Diagnosedan]

John Green Thanks that is a great comment!😁👍

[@zxtenn]

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

[@motazuk]

Thanks for your effort in making this tutorial. I appreciate the detailed explanation.

[@ojarquin74]

Awesome video, after many years ,now I understand it

[@Diagnosedan]

Really? That's awsome!

[@cherylfarrell1638]

Like your sense of humor and you’re a genius Ness

[@billbyrd9845]

You are soooooo good! I learn so much from you! Thank you!

[@sajanaabeywardana9725]

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

[@kontor15]

Dan your videos and teaching technique are awesome! Thanks for taking time to make the videos!

[@Diagnosedan]

Thanks!👍👍

[@jakefeltham1032]

I've just found your KZbin channel and it's really helping me out as I'm an apprentice who struggles with his electrical diagnosis! Great content.

[@upalimotors5504]

The lesson is clear like water Thanks Dan

[@PaulOneel]

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!!

[@Diagnosedan]

Paul Oneel, I will certainly do that one day👍

[@oscarperla4221]

Great videos indescribable a lot of knowledge about auto diagnoses

[@terribryant8025]

Love your content and your ways of demonstrating

[@4952dob]

Amazingly informative presentation. Thanks for posting this Dan.

[@nicknicu1787]

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! 👍👍👍👍👍👍👍👍

[@Diagnosedan]

Nick Nicu Thanks!👍👍👍👍

[@benjaminhad7263]

All your video's are great training aids and can always get useful information to learn and grown

[@Diagnosedan]

That's a great comment! Thanks!👍

[@TheKeenMechanic]

You are very good at what you do and very easy to understand when explaining. Thank you for your great videos

[@smithbassplayer1]

You are a great mechanic and a excellent teacher learn a lot from you keep up the good work

[@soufianattar4554]

The old videos are my favorite 😂

[@lornaz1975]

You are a very good teacher. Really! You are good at it! Thanks

[@doriancharles608]

The best explanation i have ever seen thank Dan

[@rdownmakeITbetter]

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.

[@shaunsautorepairs5410]

Thanks dan...once again you put accross an easy to understand lesson...

[@Diagnosedan]

shauns auto repairs thank you!👍

[@shellscripting9526]

Diagnose Dan FIXED IT again. Great explanation. Thanks.

[@Diagnosedan]

Thanks for watching!

[@jasonwilson9166]

Dan you or the best in what you do and the way you explain the problem and to solve it

[@kevinlewis8642]

THE BEST video I've ever seen on this subject. Absolutely awesome!

[@Diagnosedan]

Kevin Lewis Wow Thanks!😁

[@zfloz9895]

Thanks for your videos /diagnos classes !!! I have learned a lot ! Keep them coming.

[@Diagnosedan]

No problem!

[@andyireland1968]

Thanks Dan. Very educational work by you.

[@RaulRACOTEA]

Thank you Dan for such an informative video, I can only hope that most mechanics are using these methods

[@apegues]

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!

[@roadkill5333]

A very thorough explanation, indeed! Thank you, Sir!!

[@Diagnosedan]

roadkill5333 Thanks for watching my video's! 👍

[@mohamedeldin2744]

Amazing explanation for throttle body in diesel engine, great Dan!

[@branepecenica1775]

It is incredible how you simplify all of these. Thanks a lot.

[@Diagnosedan]

brane pecenica Nothing is complicated, if you know how it Works!😁

[@hammerhead6537]

Super video Dan! And thanks for all of your videos.

[@Diagnosedan]

hammer head Thanks for the comment it's appreciated!

[@exmotorsports]

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

[@Diagnosedan]

exmotorsports 🤣🤣🤣🔔🔔🔔🔧

[@yourlocalalexis4578]

Your explanations are so thorough! aloha Again!

[@gtautomotive22]

Awesome, informative and funny all at the same time, thanks Dan. You fixed again. ✌🏼 cheers from Austin Texas. USA

[@Diagnosedan]

Juan Serrano Thanks cowboy🤠🤠🤣🤣

[@stevenmales]

I like how you explain things clearly, thanks Dan

[@Diagnosedan]

Thank you Steven👍

[@iam1smiley1]

Thanks for your back to basics teaching and great demonstrations 🏆 🍎

[@Raptor-jv7fi]

Thanks Dan, I finally understand PWM now.

[@mrc6032]

Luv diagnosedan. I'm learning auto repair and electrical engineering at the same time! Thanks Dan!

[@stealthg35infiniti94]

Excellent explanation even for me, a electronic technician with 45 years of experience.

[@stogmot1]

just discovered your channel , briliantly done ,learnt so much just watching a few of your vids . thankyou for your time .

[@Diagnosedan]

Thanks George👍

[@Thunderroad8517]

Great video Dan. Looking forward to learning more. Thanks a million.

[@Diagnosedan]

And Thank you for watching!

[@Lizzard-t]

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.

[@Diagnosedan]

Thanks for the nice comment it's appreciated

[@alkisgeorgoudis1981]

DAN HOW GOOD YOU ARE TO MAKE DIAGNOSIS SO EASY RESPECT !!!!!!!!!!!!!!!!!! TO YOU

[@renecapeles7526]

very good video, great explanation and example! thank you for sharing

[@dalix1951]

There is absolutely no doubt in my mind that if anyone wants to understand basic electronics this is the channel to go to.

[@Diagnosedan]

Thanks!😊

[@iancurtis9967]

Very interesting, Thanks for your time and effort in making this video Dan.

[@Diagnosedan]

Ian Curtis Your welcome!😁

[@movingupautodiagnostics8645]

You did it again Dan! Thanks for the PWM class, you're a great teacher.

[@Diagnosedan]

Moving Up Auto Diagnostics Thanks it's appreciated!😁

[@movingupautodiagnostics8645]

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.

[@mk-jl3zd]

Thanks Dan,very intuitive,appreciated.

[@jaydee2620]

Wow this dude is amazing, ur a bank of knowledge.

[@dumisanitembanimtisi8411]

Learning everyday,that's super delicious 😋. Thanks Dan. My best channel everyday!

[@StefanBergman]

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.

[@vlstyles]

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!

[@Diagnosedan]

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 !

[@aungzawoo4014]

Wow, it is an excellent video for complete learning of the nature of PWM signal. Thanks indeed,sir.

[@CHIBA280CRV]

Very clear explanation along with detailed. I'm loving the videos.

[@Diagnosedan]

That's great to hear!

[@sokphanithmao5523]

i learn alot from this channel. thank you so much for your share. thank you Dan

[@efrenventura6292]

Thanks Mr. Dan, I've learned a lots from your vid. More power and more vid to come👍

[@richardbeckwith4545]

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!

[@sollykhan2385]

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 😇

[@a1mechanicaloakey639]

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

[@Diagnosedan]

A1 Mechanical Oakey Thats a great compliment sir!😁

[@fieldsofomagh]

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.

[@Diagnosedan]

Tom OConnor Wow! Thanks for the great comment!👍

[@alandmunk3h]

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

[@Diagnosedan]

Ha ha i can read your mind🤣🤣

[@digitalmonkey3286]

Another awesome video! Thank you for the shared knowledge, Dan!

[@Diagnosedan]

Digital Monkey No problem!

[@miztwaas]

wonderful!!! simple to understand your explanations.... thanks you

[@Diagnosedan]

Thanks for watching!

[@christopherbateman6126]

Cheers Dan it's so good to learn something new 👍🏼👍🏼👍🏼👍🏼

[@petecurran3995]

Great work, DD - just shows that many shops don't have the skills base when it comes to fault tracing wiring runs. 👍🏻

[@nolegotube]

Awesome vid !! Greetings from Spain. THANKS!

[@michaelmihailov8074]

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!

[@Diagnosedan]

Wow that's a great compliment Michael, it's appreciated and thanks for watching my video's!😊

[@PaulysAuto]

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 😉👍👍👍

[@DPoner]

I have a 2.0 golf with the same code. This has helped immensely, thanks!

[@mashamambea5704]

i love the way u explain to the detail keep it up Dan

[@Diagnosedan]

No problem 🤣🤣

[@jetskioremor6692]

Great information,I’m learning a lot from you.Im very thankful for your channel and all the videos,I’m a big fan.from Western Australia

[@Diagnosedan]

Gerald Romero Wow Australia!👍👍👍

[@jackacres3936]

And a very interested Eurocar owner in New Zealand, Many Thanks for taking the time to make these videos and teach us layman in terms we can understand!

[@lukaspuzia3970]

hey Dan, really like your Videos and the Results even more. Respect!!!

[@mohammadal-gebaly3046]

Great Dan , fantastic Video , God bless you .

[@billrimmer5596]

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!!

[@Diagnosedan]

Bill Rimmer Wow thanks Bill! I'll do a more personal video for sure!

[@marcioreis2648]

You sir are a very talented and smart. I learn a lot with your videos. Thank you so much.

[@Al-si9zp]

Great videos Dan. You are one knowledgeable man!

[@mahmoudblead3445]

Thanks Dan you are amazing, after watching ur videos now I can fix my car by myself.

[@Spelter]

oh dan, i love to learn from you and get new ideas. keep it up man.

[@Diagnosedan]

Thank you!😊👍

[@augstspriegumshightension]

Ooo! Very good light of education. Thanks!

[@Diagnosedan]

Thanks👍

[@stevenkietzke5582]

Enjoy the way you explain the system

[@Diagnosedan]

Thanks Steven!

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Who needs college when you’ve got DiagnoseDan.. Another clear and concise diagnosis. Spot on.👍

[@Diagnosedan]

wardybasher Ha Ha 👨‍🎓💪👍

[@adamking6419]

👍👍 well done again Dan you need to be teaching the next generation!!

[@Diagnosedan]

Adam King I'm trying!😉 Since they are on computers 24/7 KZbin seems to be the way to go😁

[@diypapie8428]

Hallo dan!! Bedankt voor de duidelijke uitleg en ze functies ervan !!! Altijd interessant om te kijken en werkelijk bij te leren Top en een prettig nieuwjaar !!👍👌

[@josekuttyantony7490]

very good teaching Dan Thank you .I am so Interested

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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.

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You do know that Johan is dead don't you😂😂

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best channel ever ,wish you all the best.

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Thank you Dan, loved this video

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Why does one need tech school when there is DiagnoseDan. Great video. Thumbs up.

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Your a great teacher, and fun to watch. 👍

[@Diagnosedan]

Thanks!!