CAN Bus Communication Explained (Part 1)

[@scottnusser6232]

Old fossel here, been shop owner and wrench 45 yrs. Almost turned you off, another freekin egghead I says, but your demeaner kept me watching. Learned alot, thankyou! Nice to see young man with passion for your proffesion! I subscribed! One thing you said is huge and very overlooked. Take the time to thouroughly inspect vehicle. Fixed alot cars in my time with eyeballs, best tool in the box!😅😅

[@GoTechTraining]

Thanks for the support and for reaching out! I 100% agree visual inspections are so important! ~Ryan

[@sollykhan2385]

do Snap-on tools sell that special tool ; 'Eye Balls' ? 🙂

[@SchrodingersBox]

Wow it’s clear you spend a lot of time preparing this. Very well presented! Looking forward to the other parts.

[@GoTechTraining]

Hello, Thank You! It was quite a bit of work to get the flow correct, but it was also a lot of fun to make. ~Ryan

[@rickrogers2649]

Great stuff Ryan. I'm an old retired guy trying not to fall too far out of the loop. Thanks for all your help. Looking forward to the next installments.

[@GoTechTraining]

Hey Rick, Thank you! for supporting the channel and reaching out! I’m working on part 2 now! Stay tuned ! ~Ryan

[@raisedbygypsies5171]

Well done Ryan! When you think you know a tricky subject, try to explain it in a concise way so everyone can gain from it. You did this very well! Looking forward to part 2.

[@GoTechTraining]

Thank you! Part 2 coming soon!

[@on-site4094]

It started with emissions & keeps improving today it’s a a full fledged computer with a module to control each sector

[@OR-River-Rat]

Thanks for demystifying a complicated topic. As someone who's worked on data networks for 30 years, I'm impressed with the core principals you shared.

[@sockrobber99]

My ECU blew 2 times and I had to print out the ECU/CAN lines and Crayola them for the dealership at the time to have them actually fix the problem for the third ECU... you just validated the entire video with that one line IMO.

[@euko6876]

Ryan's a phenomenal teacher especially within these systems. Thank you for all your hard work & expertise

[@terryharvey8627]

Thanks Ryan for giving us insight on breaking down the house of cards. A deck of 52 is harder to test than a suit of 13.

[@GoTechTraining]

Yes it is Terry! Someone was paying attention! Thanks for watching! ~Ryan

[@JCWren]

This is a really good video. There's one reason you didn't touch on as to why there are so many busses. Besides trying to isolate a single failure from taking down the entire vehicle, silicon and plastic is still cheaper and lighter than copper wiring. As an example, it's cheaper and easier to run a single power wire and a smaller gauge pair of CAN bus wires to the tail light module than individual wires for the turn signal, brake light, and backup light. Plus the tail light module can self-diagnose lamp failures and report those back. Of course, the downside is that the tail light module is 20x more expensive if you have to replace it, and you'll be lucky if you can still find one 10 years later. This increases the likelihood of the car being declared totaled after an accident, and the vehicle needing to be replaced, which definitely benefits the manufacturer.

[@GoTechTraining]

Great point ! Like window switch’s with three wires and 100 functions! Thanks for reaching out! ~Ryan

[@Vagtech-b4m]

Nothing less than fantastic classroom teaching in relatable language. God bless you for doing this for all us tech that are in the game from years ago as you e given us a training course that was just not available unless we were in main dealers. I'm getting back into the trade after a decade away and hearing that it's impossible to get a good tech these days. So thank you so much for paying it forward. Your a great teacher and top tech.

[@eacherenkeka]

Great information Ryan! This system is complicated but if we break it down before we connect the oscilloscope and the multimeter it should be easier. Thank you for the class! This topic is very important for all techs!

[@GoTechTraining]

Hey Keka, I agree 100%, we need to simplify these complicated systems so we can have a fighting chance to diagnose them. Thanks for reaching out and for checking out the video! ~Ryan

[@FORDTECH313]

I have delt with communication problems many times not once have I used a lab scope thank God

[@GoTechTraining]

Hey Fordtech313, My scope is definitely not my first step in comm issues ! Thanks for watching ! ~Ryan

[@mikechiodetti4482]

Thank you Ryan! Eric O from SMA used to explain how to separate the modules. Ivan from PHAD explained and then separated the modules using his wiring diagram and clip board. In both SMA and PHAD the viewer got to see the vehicle start and run with the problem still further down the line. Also the tech tips for bypassing a module to test the system. ( High, Medium, Low Speed CAN.) You're explaining how to test the systems, what to look for (green crusties, mice bites, etc) and ya, sometimes you do get lucky during a visual test.

[@GoTechTraining]

Hey Mike, Both solid YT channels! I’ll have to check those videos out! Thanks for watching and stay tuned for part 2! ~Ryan

[@edthompsom9368]

So simple a DIY'er (like me) can follow....thank you!

[@GoTechTraining]

Hey Ed, You're very welcome! This is the way I diagnose CAN in the shop. I'm glad you enjoyed the video! ~Ryan

[@jimyep9971]

Same here. great video.

[@tedjohnson64]

Phenomenal presentation! Loved the historical to modern progression, and the myriad analogies and real world examples. Now I can finally understand what Pine Hollow Auto Diagnostics and South Main Auto are doing. They zip through the wiring diagrams so quickly, I could never quite follow their logic. It all makes sense now. Cheers!

[@geovanybonilla2244]

Thank you for the information, for taking your time and sharing your knowledge with us, it is very helpful. Thank you

[@GoTechTraining]

Hey Geovany, Glad you like the video and we are working on part 2 now, thanks for the kind words! It helps motivate us to keep making videos! ~Ryan

[@gasgas2689]

That network at 8:44 reminds me of 1975 when the bank I worked for first joined all 300 branches to a central computer where I worked. Each one of your individual networks was a city or county with several bank branches, and each area connected to a multiplexer which in turn communicated with the central computer. I can understand that ! 😃

[@samuelgraber6921]

Thanks for Awesome simple video on Can Bus. I'm a young Mechanic starting out and it's hard to diagnose something that you don't understand. And thanks to all the techs in the comments sharing information!

[@enriquediaz1591]

Thank you so much sr. After watching your video, things are more clear than before for me. I’m still need more to understand the net work but for now it’s more better. God bless you

[@venharis2012]

I was a dealership trained ASE master auto tech from 1984 to 1994. After years of low pay and disgust with the way the industry was run, I got out and went back to college. If today you guys are at this level of technology and still working at a dealership or independent shop on a commission basis and still having to deal with the cut throat warranty programs, your nuts and should have your heads examined. There are way easier ways of making money on the clock just waiting around for something to break down. I worked Frac as an E-tech for 8 years. I basically worked 12 hours a day and got paid 16. We sat around and listened to the radio waiting for a call. Some shifts there was no calls. When there was a call we usually got it fixed in 15 minutes and they got back to work. At weatherford they were paying us every two weeks, per diem every two weeks and a monthly $1500 bonus. That's five checks a month... Yearly earnings were $120K to $140K per year. Don't let the auto repair industry short change you fellas. There is a whole world out there that needs your expertise and is willing to pay you good money for it and they won't make you bust your ass for it most of the time...

[@GoTechTraining]

I agree Auto Technicians are some of the most grossly unpaid people in the workforce. ~Ryan

[@NewLevelAuto]

I learned today that we dont give Ryan crayons and expect him to stay in the lines 😊. But honestly a great job 👏!

[@GoTechTraining]

Hahahaha, Almost as bad as my handwriting lol! 😂

[@cpcoark]

This looks like an excellent class. Looking forward to the future parts

[@GoTechTraining]

Hello ww_big_al, Thanks for checking out the new video! Working on class number 2 as I'm typing! ~Ryan

[@shaffere33]

Thoroughly enjoyed the breakdown of networks and ways to diagnose them. Great video

[@GoTechTraining]

Hey Eric, Glad you enjoyed the video! Thanks for watching! Part 2 coming soon! ~Ryan

[@arthurfricchione8119]

New subscriber who is trying to learn CAN SYSTEMS. FIRST excellent presentation. I have listened to it being explained to me before but this explanation is a terrific place to start and you explained it very well. It is so easy to become overwhelmed. I’m sure l’ll watch it over quite a few times I know I’m sure I missed a lot but it’s nice to know how everything is laid out before troubleshooting. Thanks for sharing. Artie 👍

[@GoTechTraining]

Welcome aboard! Artie! Thanks for checking out the video! I hope you enjoy the rest of the CAN Bus series! ~Ryan

[@jorgemat8080]

Absolutely amazing information. Thank you for taking your time and knowledge and share it with all. 👍

[@GoTechTraining]

Hey Jorge, Of course! Thanks for checking it out ! Glad you liked it ! Part 2 coming soon ! ~Ryan

[@Sebastianx115]

Best explanation of can bus I’ve seen online

[@GoTechTraining]

Thanks for watching! Glad you enjoyed it

[@manueladams5327]

Glorified Map reading- great stuff- Big Thank You!

[@shakeelsss]

It helps a ton to watch your educational videos over and over.

[@henrynwosu6277]

This is world classs❤❤❤❤ love it so much. Exquisite. How you start from explaining the problem of the need to communicate between modules. Then, you highlight the evolution of the network design, then you ahow why each module is needed. Especially that gateway module part. Because I always thoughg these automobile manufacturers were just being a pain by making so many modules. Thanks so much❤❤❤. It has made me appreciate the complexity.

[@Ianf1x]

To really help it would be nice if all manufacturers had the same can or lin etc colours. Yes there will be at least 10 different pairs and when looking at the module / node's it would be easy to see 2/3 network's on same module. Fantastic start. Been doing car electrics 30 years and I have learned a lot today.

[@GoTechTraining]

Hey Ian, Thanks for reaching out! I agree with having a little more standardization in wiring. Glad you like enjoyed the video! ~Ryan

[@yloow2]

This guy makes it enjoyable.

[@GoTechTraining]

Thanks for watching! ~Ryan

[@ebuks4ever]

Absolutely. I was glued to the screen the entire time. I love how he keeps making it look interactive.

[@billybunter6659]

I'm not a tech but i've been working on my own vehicles for many years now and i find this kind of information very interesting indeed.. Funny isn't it though,we have all this technology but still have to put a smelly liquid in and burn it to make them work. Excellent video

[@GoTechTraining]

Thanks for watching! Electric cars are gaining popularity! ~Ryan

[@Mr18Chapin]

This is Gold man. Very informative & great way of explaining everything.

[@GoTechTraining]

Thanks for the kind words! It means a lot you enjoyed the video! ~Ryan

[@bakryahmed9178]

This is the greatest lesson I have ever seen.

[@FORDTECH313]

But I have learned alot from your channel and I am thankful I have been on my own now for 4 years these cars are getting more difficult to work on but not only that lots of customers are getting more short tempered patients is a thing of the past as techs we don't just look at one or two cars a day some easy and some very difficult sometimes we can look at one to nine cars in one day I love working on cars I enjoy seeing customers faces when there car is fixed they get so happy but everything is changing the world is changing

[@GoTechTraining]

I agree! Some days are good, somedays they get the best of you. As long as Techs likes you still find the pride in their work and stay positive through out the change. They will be successful and come out on top of the “automotive revolution” as I like to call it. Keep wrenching and feel free to reach out if you need a second opinion. Every time I feel i finally caught up, some car comes and kicks my butt. Thanks again for reaching out ! ~Ryan

[@FORDTECH313]

Thank you I sure will I appreciate it

[@madmike214]

Outstanding I really struggle with communication diagnosed this will be an awesome series

[@GoTechTraining]

Hey Michael, Thanks for checking out the video! I'm glad you liked it! Part two is coming soon! ~Ryan

[@petehalasz7547]

Great video and narrator.. i teach for a corporation, and what's even worse is that 3 manufactures.. They have now stuck their parts in the same car and of don't get along. What's worse is information,, so like you,, I teach my techs to always,, always bring out the canbus schematics,, and split everyone up.. I have several vehicles which are completely gutted out, and we diag each group or groups... It becomes very clear and simpler.. Keep up the great work..

[@bnewton239]

i am glad you are doing this training for us. part 1 was great.

[@GoTechTraining]

Thank you, I’m happy you liked the video ! Working on part 2 now, should be out soon ! ~Ryan

[@Bobbygale121]

Learned a whole lot, You are worth your weight in Gold my friend. Looking forward to the rest of the series.

[@GoTechTraining]

Hey Robert, Thank you for the kind words ! Part two is coming soon! ~Ryan

[@tomhague1162]

Very well done. Now I can have a far more intelligent conversation with my mechanic. We can now talk the same language.

[@EastsideGhost]

VERY HELPFUL Information.. Cant wait for the other parts.. Youre the man RYAN..

[@GoTechTraining]

Glad you enjoyed it ! Thanks for watching and reaching out ! ~Ryan

[@whiphaven]

So well explained, even I understood it. Brilliant explanation of how everything works and can be tested. Thank you so much

[@pakinayapantecatl9473]

I have seen other bus network videos but this one is the best one ...very well explain and learned a lot from your video...thank you and Godbless you ..👍👍👍🙏

[@PaulR387]

Very good young man, a lot of these you tube can bus videos focus on 1 network which isn’t the case these days, you’ve explained the breaking down of network’s excellently

[@treyinok]

Looking forward to the next parts. Great work!

[@GoTechTraining]

Hey TreyInOK, Next part is in the works and coming out soon! Thanks for watching! ~Ryan

[@ifell3]

After watching this I feel like a rich man driving my xp90 ^^ Fantastic video with practical targeting of symptoms.

[@GoTechTraining]

That XP90 will go forever!! Thanks for watching and reaching out!!! ~Ryan

[@ifell3]

@@GoTechTraining yes, since replacing the stretched timing chain as previous owner skimping on oil changes and a known TSB 😅

[@GoTechTraining]

Keep it going !!!!

[@terrellscaife2411]

That’s really incredible. My weakness is understanding diagrams. I know that would help me out a lot on electrical stuff on the vehicle so I’m going to be watching your videos more often to up my game thank you

[@allroundtalker]

I can help you start understanding wiring diagram.

[@terrellscaife2411]

Yeah, that sounds cool

[@kaestnerducran7628]

Very good explanation of the CAN bus system. Your video gives me a three dimensional way of thinking for troubleshooting a system. Keep them coming.

[@Ricky-kp5ys]

Very good video the teaching was really interesting and easy to learn from,thank you for sharing your knowledge and experience I’m really looking forward to seeing more can’t wait 👍

[@GoTechTraining]

Hey Ricky, Thanks for watching! I really wanted to show how uncomplicated this can be with the right approach. Working on Part 2 now, should be out soon! ~Ryan

[@somethingnew3338]

I love your approach of real tangible engineering stuff

[@irishbob6771]

thanks so much for all the work you put into this. very practical and easy to understand video. much appreciated

[@GoTechTraining]

Thank you the comment! That’s exactly what I was trying to do!

[@sparknut5338]

Great logical analytical approach and explanation. Thank you for making these videos!

[@GoTechTraining]

You're welcome! Thanks for watching! ~Ryan

[@shakeelsss]

Great explanation and I can see major improvements when it comes to network diagnostics. I couldn't ask for more.

[@sollykhan2385]

Thank you so much for posting this awesome video, Ryan 🙂it was the best explanation on the entire Ytube, really made sense, looking forward to viewing the other material that you have so kindly posted, keep up the great work. i have a Mercedes W205 here in the Shop with innumerable problems, and i hope to get to grips with it, certainly i feel confident now after watching this video, Bless 😇

[@nourfaheem3688]

Wonderful, organized and very helpful explanation. Thank you very much for you sincere efforts

[@tonykinser2678]

I have to say i have watched several videos on can network and the way you went through it was absolutely the best look forward for the rest

[@GoTechTraining]

Hey Tony, Thank you for reaching out ! I’m glad you liked the video! Part 2 coming soon ~Ryan

[@superk4562]

Great stuff! Now we know why we have continuation training; there's always something new to learn.

[@troysmith9453]

Ryan thanks man just finished part 3 and I tell that 120 resistor 😊 I need to watch it again thanks alot homie we family now.

[@alrifainidal]

thanks so much for all the work you put into this.

[@GoTechTraining]

Of course! Thanks for reaching out ! Glad you enjoyed the video ! ~Ryan

[@smiles7631]

I really like those topology maps the scanners have now. I just can't afford it right now. Hopefully it won't be long and that will be on the lower end scanners soon. Things are changing pretty fast. I bought a Autel Mp 808 a couple years back and thought I had done pretty good for like 800. Now you got to spend almost 2000 to get the topology and coding. I think patience is going to help me. Just fixing em on the side now. Thanks for the great video!

[@GoTechTraining]

Hello, One thing I love about scan tools now is all the options we have. Autel alone has over 20 different scan tools to choose from. But your right, 2-4 grand for most of the higher end ones these days. But I guess it's better then only having Snap-on's $10,000 dollar scan as a choice (even though I do like that tool). Thanks for checking out the video and reaching out! ~Ryan

[@bernardaflores1720]

X tools D8 has Topology for around 700 dollars.

[@esiebert7625]

Topdon letsyou buy the topology function for $99 if you get their low end Phoenix scanner (Phoenix Light)

[@emmanuelrobert1216]

You are a good teacher...Well done Ryan👍

[@Jam-kq6hw]

Thanks you did a great job of braking it down made me want to learn more of this subject

[@shamessun]

Thank you man …. your way and explanation is just so good

[@GoTechTraining]

You're welcome! Glad you enjoyed the video! Thanks for the support and reaching out! ~Ryan

[@CesarCano-e7x]

Congratulations , you guys always show great lessons on driveability diagnostics , which is one of the most difficult areas in automotive repair field .👏👍

[@salvadorgutierrezr5914]

Thank you for teaching us Ryan 🙏

[@GoTechTraining]

Hey Salvador, Thank you for watching! ~Ryan

[@isalmankhan1]

Thanks for taking us on-board guy's👍 Stay Safe👍

[@GoTechTraining]

Hey Salman, Thanks for all the support! Glad you liked the video! ~Ryan

[@isalmankhan1]

@@GoTechTraining Love your content Ryan, really learn a lot from you Guy's😍

[@kevinavery2518]

just to add, these vehicles will do weird things if something isn't communicating, I just got done doing an engine on a 22 gmc sierra 6.2l, i like to run my engines before I put everything back together, make sure i dont have any leaks or noises and such, had the snorkel off maf disconnected, started the truck, no oil pressure on the gauge, truck ran great, no noise's so I knew it had oil pressure went at diagnosing the oil pressure sensor, all tested fine, only code stored u1345 lin bus lost communication with ecm, went down the rabbit hole, looked at my lin bus coms, learnd that the maf is on that, went ahead and put the snorkel back on, plugged in my maf sensor, and boom, oil pressure on the ipc now works, makes no sense to me, but now I know...lol

[@GoTechTraining]

Hey Kevin, Wow! That is crazy, it is almost like it went into a weird default mode because the MAF sensor wasn't talking. Thank you for sharing, information like this can really help someone that may run into a similar problem! ~Ryan

[@chrispeterson8402]

Awesome start!

[@GoTechTraining]

Hey Chris, Thanks for watching! ~Ryan

[@A_plus_Auto]

Thank you ! your information helped me in understanding how everything works

[@-Primer-]

Well this explains the lack of "Accessory" wires in the multiple interior fuse boxes in my 2024 Sierra Pro. Plenty of constant power wires, but no "key on" wires to tap off of.

[@timothyhowell3419]

outstanding presentation of a difficult topic for many of us. Thanks'

[@ThunderbirdRocket]

You hit it outta the park ! Thanks mate !

[@GoTechTraining]

Thank You! Stay tuned for part 2!

[@stationaryenginesworldwide]

Great information. Looking forward to the next one part two!

[@GoTechTraining]

Thanks for watching ! Glad you enjoyed it, part 2 coming soon ! ~Ryan

[@ClintonSnow]

Excellent video, it's very well explained showing the graphic view for all the wiring diagram. Please do more video like this one.

[@nimairikowa5650]

Thank you! can't wait for part 2

[@GoTechTraining]

Hello Nimairi, Working on it as we speak! Thanks for watching! See you for part 2! ~Ryan

[@vernaltheuberdriver.3491]

Love this lesson. It’s a lot of have issues with this.

[@GoTechTraining]

Glad you enjoyed it! Thanks for watching! ~Ryan

[@jrguzman1320]

Broooo!!! Your the man! Mothafuquen jedi! This video gave me hope! I am now confident and motivated! Keep making videos dawg! We need you!

[@montanaautoworks]

This video is brilliant.You're a great communicator sir! Subscribed.

[@joemikos900]

Very compelling, great format. Always appreciated guys

[@GoTechTraining]

Hey Joe, Thanks for tuning in and showing your support! It gives us the motivation to keep making videos! ~Ryan

[@AndrewLoo-dp9tw]

hey nice video. one of the best i've seen. Thanks. Im working on a same problem but I'm getting close to 10 volts on Hi and Lo line. still trying to figure it out. thanks for the video

[@richardcranium5839]

i must say nice presentation. there are so many analogies one can make as to how this works. i'll spare you my take on it, lol. looking foreward to the next installment.

[@GoTechTraining]

Hey Richard, Thanks checking out the video! Definitely at of analogies! Lol Glad you enjoyed it! ~Ryan

[@ebuks4ever]

You just gained a happy Subscriber. Thank you so much for making this super fun,

[@wentzelnel7723]

Brilliant lesson mate. Thank you

[@GoTechTraining]

My pleasure! ~Ryan

[@farmanyusif3558]

Well done thank you for informations that share with us....

[@GoTechTraining]

Hey Farman, You’re welcome! Glad you enjoyed it! Thanks for reaching out! ~Ryan

[@emmanuelrobert1216]

I've watched to part3....If you wish to learn and understand well...please don't miss this series

[@armintokovic99]

riley nice video to build confidence without making it to complicated with data communication oscilloscopes for CAN communication without specific U code is not worth it. and the teaching metodic “how to think” is super

[@GoTechTraining]

Thank you so much! I appreciate you reaching out, glad you enjoyed it ~Ryan

[@andrewyear81]

Now that was some good stuff!!! Thanks a bunch Ryan. Ill be keeping your remark on how this is all just "glorified map reading" in mind. I also agree that it is beneficial for us that all the different modules are linked in different groups allowing for us to just observe patterns and figure out the common factor if presented with a list of trouble codes. Now what would one do with out a "CAN MAP?" Not sure if any one has ever told you and Im certainly no expert but it seems to me that you're a natural teacher.

[@GoTechTraining]

It would be tough with out a Map, alot if trial and error. Thanks for the kind words and supporting the channel. ~Ryan

[@roderickzappareynolds2316]

Fantastic video Ryan! Thank you!

[@GoTechTraining]

Glad you liked it! Thanks for reaching out! ~Ryan

[@gaberubio4733]

Thank you for breaking this down!

[@alexrojas2121]

Thanks for creating this. So helpful

[@GoTechTraining]

Hey Alex, Thanks for reaching out ! Glad you enjoyed it! ~Ryan

[@DavidFKturbo]

This was very well put together, Thanks a lot!

[@GoTechTraining]

You're welcome! Thanks for watching! ~Ryan

[@neilmcrobbie7010]

thanks for the info Ryan!

[@GoTechTraining]

Thanks Neil! You use your terminal test lead set yet ! ~Ryan

[@neilmcrobbie7010]

@@GoTechTraining not yet.....soon

[@jonwillfixit]

Thank you for making this series, very helpful 👍🏻

[@balbie29]

Very interesting and I learnt a lot. Thank you

[@GoTechTraining]

Hey Balbie29, Thanks for reaching out and watching the video! Stay tuned for part 2! ~Ryan

[@saibabupodala6297]

Very good information thank you

[@GoTechTraining]

You’re welcome!

[@leroyking3058]

God bless you for giving us this information...I'm at a lost now trying to find out why my fuel pump keeps dieing..have 12v at wire hardness 9.8 on ground. Don't know why..new relay..

[@bartowl]

this is awesome material. Thank you very much!

[@GoTechTraining]

Glad you liked it! Thanks for reaching out! ~Ryan

[@eltonluz94]

Thank you so much. You explained it very well.

[@JohnDoe-wv5hv]

Excellent education! Thank you much!