CAN Bus Troubleshooting and Diagnosis Explained (Part 3)

"Fixing a CAN Bus issue is a step-by-step process!" In this third and final video of the series, we will put our process to the test to solve a communication breakdown. While still maintaining our real world approach we will work though each step discussing the results as we go.
CAN Bus resistor -- amzn.to/3OIAUWm
CAN Bus Communication Explained (Part 1) • CAN Bus Communication ...
CAN Bus Wiring and Protocol Explained (Part 2)- • CAN Bus Wiring and Pro...
#cars #learning #autorepair #diy #fixed #communication #diagnosis

[@Dcalvert92]

I’m mechanic for Caterpillar. The enhanced understanding I gained from your series allowed me to repair a Grade & Slope system on an asphalt paver that nobody could figure out. Thank you so much for this!

[@Ariz04]

you sir are the goat. Im, currently doing a harness merge on my 00 subaru and learn as i go. For the past weeks i've learn to myselft how to read the subaru diagrams and what they ment and how they work. And when you showed a subaru wiring diagram on the video, I quickly went "is that a Subaru diagram?". And it was so funny to me that, it is and i quickly recognized it 😂. Canbus does not really apply to what im working on right now. but for future reference (my 08 rx8 that has a canbus system) , really gave me a full understanding on how newer cars work and gave me ideas on how to diagnose these "new systems". great video series. I definitely learned a lot. 👍👍

[@heny3231]

Knowledge + Experience × Passion ÷ Humour = Awesome Tutorial ! Thank you so much Ryan

[@GoTechTraining]

My pleasure! It was a lot of fun to make Someday we will have to post a bloopers reel. 😂 ~Ryan

[@heny3231]

Bloopers lol, that would be a bonus, but please tell me there will also be a Part 4, another vehicle, different network as you hinted, "maybe" ?

[@GoTechTraining]

If the right car comes along I’ll definitely make a part 4 !

[@markzielinski14]

Awesome series. It can be so helpful to an occasional weekend warrior like myself to simply understand how some of the systems like CAN even work. It's nice to know I should have at least a general idea what I'm even working with when trying to find a problem. Thank you for this awesome series, and especially for part 3 for tying it all together with a real world example. This was a few hours of my time very well spent!!!

[@GoTechTraining]

Thank you so much ! It is great to hear responses like this! ~Ryan

[@shakerunis101]

Im a DIYer and these 3 classes were helpful in an astronkmical way. Quick note, when you were checking the JC near the pillar for short to power and short to ground. Me being a beginner, I wish you would have told us what we would see if it WAS shorted to power/ground/eachother. I subscribed!

[@GoTechTraining]

Thanks for watching! Welcome to the channel! If saw anything under 1000 ohms I would be concerned, if I had good continuity or low resistance like under 100 I would know there’s some type of short. ~Ryan

[@Me-zo8yc]

@@GoTechTraining Hi guys everything OK with you? Just realised I haven't seen a vid from you in a while!

[@johnathanhenriquez5313]

You makeyself feel confortable because Im into a troubleshooting right now in my job with a Chinese TRUCK with no to mucho informático support related to a no communication issue with the ECM and I determine there's is a wire loom problem and watching tour video tells me Im no too los in what Im doing😅 Excelente video and explanation, thanks to invest tour time in do the video to share 🙏🏽you are very good man!

[@daveshymske4392]

Thank you for making this 3 part series. Very useful . Your efforts are much appreciated

[@GoTechTraining]

Glad you like them! Thanks for reaching out! It nice to know people appreciate the series! ~Ryan

[@mikeburdi3464]

Props on a great series Ryan! All 3 parts so far were easy to watch and more importantly, easy to understand. Your teachings have allowed me to sharpen and hone my skills when it comes to CAN diagnostics and repair. Thanks for your time, I'm sure it's not easy putting these tutorial videos together. 👍🏻👌🏼

[@mathewhull5070]

Thankyou for helping me understand can bus diag better. You have helped me alot. I am greatful for people like yourself for sharing your knowlage with people who want to learn. Keep up the good work.

[@nimairikowa5650]

Best Investigator for Wiring Faults on the CAN BUS network👋👌✌🤘.

[@GoTechTraining]

👍 Thanks for checking out the video !! ~Ryan

[@hotsparklab]

I watched your series just to understand can bus better in general for a custom project. Now I want to be a mechanic when I grow up! :D Thank you for the excellent walkthrough.

[@fredcroad331]

Great series, I started working on cars when Ford had the eek series. I don't do it anymore but do mess around when i can pick up a cheap car to mess with. I still got it so far.

[@matte.hartman]

Just watched this series and i must say it was one of the best ones so far, explaining the different systems 👍

[@GoTechTraining]

Awesome! Thanks for the feedback! Glad you enjoyed the series! ~Ryan

[@thomaslauchand71]

Thank you for teaching me how to understand all of this, I'm from Mozambique and because of you I will change the way people diagnose most of the cars here, btw I'm focused in bmw and merc cars..

[@chrisi1909]

Great Part 3 - Overall great Class in total - Hope we get another one some day sooner or later.

[@GoTechTraining]

Thank you so much! Glad you enjoyed it and followed the series! ~Ryan

[@terryaustin1126]

I am not a technician, I just play one on weekends and your 3 part series was excellent that I just had to leave a comment to express gratitude for all your work in putting it together. Thank you.

[@smiles7631]

Thanks Ryan! I started to get lost when you were explaining the wiring diagram and comparing it with the car. But after I went back and studied it more I was saved, lol. Thats just a matter of experience and I have about zero with Can networking. Your videos helped me understand how the systems work and I have a little bit of confidense now. Thanks again.

[@GoTechTraining]

Great to hear! You're welcome! ~Ryan

[@pingpoon8394]

Hi Ryan: Data bus is a A Must to know in the future, I have kicking up a notch on how data bus systems work after watching your videos. A quick and dirty way is to look up the wiring diagram to located which modules have resistors and do a ohm test on it follow up by substituted 120 ohms resistor to make sure all other modules are good. Thank you so much.

[@cpcoark]

Great video. I'm working on a PT Cruiser right now with other electrical errors. Not a CAN problem, but I used its communication schematic to follow along with you. With your help, I was able to see how it worked and how to troubleshoot it if I need to. This has to be one of the BEST educational series on KZbin.

[@GoTechTraining]

Thanks for all the support during the series! This comment, along with others help motivate us to keep making videos ! ~Ryan

[@transuniqueltd]

I’m telling you, the best educational video thus far.

[@benkeys2702]

Best video series I've seen so far!! I've applied what I have learned from your videos, but I am still a little unsure of my diagnosis. I have a 2013 S550 4matic with the do not shift error. Scanned the system and got no can message for about five different modules but no faults in the gateway module. I think the problem is the gateway module. The voltage and resistance are good on every can connection. I don't have a scope yet. It's in the mail.

[@SchrodingersBox]

Really good series. I have learned to appreciate the more complex network designs ever since I had a short in an air conditioning system cause a no-start by pulling down everything on the network. It then became apparent “ohhhhhhhh- NOW it is clear why a gateway is useful!!!”

[@GoTechTraining]

I agree it is nice to have something split these networks up! Thanks for checking out the video! ~Ryan

[@mikeburdi3464]

@SchrodingersBox was the AC short causing the no start on a Ford f150 by any chance? The reason I ask is because I have seen this multiple times on those vehicles, usually late 90's up until mid 2000's. I just recently subbed to your channel as well. You guys all have some great content. Keep it up! 👍🏻

[@razobaghd1696]

Excellent!!!!! Your diligence and passion for teaching is greatly appreciated by all of us who are in the automotive field , l am sure. Stay healthy and Happy, always.

[@MiracleMAX]

Great job Ryan! As a part time trade instructor, running a business and a KZbin channel, it can be hard to explain to students the diagnostic process. Thanks for an excellent 3 part series, which logically broke down the process into manageable sections. It has given me some great ideas to include in my classes. Cheers MiracleMAX

[@GoTechTraining]

I appreciate that! Thanks for watching! ~Ryan

[@pantelis241]

Great video Ryan and thanks a lot for the info and the effort you made. 💪👍

[@rbrito3691]

Very good videos man..thanks a lot....I'm an electrician and now I have a better picture how cars work.

[@donc2924]

Thank You, i have found this informative. its slow at work today so i thought i would reinforce my diagnostic skills. your method of adding a resistor seems to be a very useful process that i will certainly take advantage of in future diag. i have had a few communication failure jobs in the past couple weeks, 1 - 2007 pci bus and 1 - 2017 can bus issue and i found myself learning more than diagnosing. This series will definitely save me some time later. subscribed

[@8power0]

NISSAN AND KIA ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, COULD POSSIBLY HAVE YOU WEEPING .OUTSTANDING CLASS THOUGH AND YES WOULD LOVE TO SEE YOU TRY TAKING THEM ON BECAUSE THEY HAVE PROVEN TO BE SOME OF THE MOST DIFFICULT NETWORK CRASHES OUT THERE. PLEASE KEEP UP THE GREAT WORK THANK YOU!

[@GoTechTraining]

Sounds good ! If I come across one, I will be sure to film it! Thanks for watching! ~Ryan

[@DestinyOkoh-co1lm]

Thank i fully understand your class. This is one of the best can bus video that I have ever watch great video

[@mjautojeth1717]

Excellent presentation of your wisdom and passion for empowering and encouraging many enthusiasts out there. Your understanding and knowledge of what you do is fantastic, and I definitely learned a lot from you videos. Thank you very much.

[@michaelvonk5560]

Thanks, I learned so much from your video. I love how in depth you went. I will now try and solve my can buss issue in my 2006 raider. I will let you know how it turns out. I will also revert to your videos if I run into problems. Thanks for all the time you took to make these videos. Outstanding!!!

[@MikeCromwell-s9z]

Thanks! 35 year tech. I watched all three parts and it is the best explanation of network theory and diagnosis I've seen. Got a lot of info through my thick skull and cleared up some fog in my old brain Thank you!

[@abderrahimmark]

Watched all the three parts. one of the best out there in youtube. You are a great teacher. Thanks alot for making this series.

[@GoTechTraining]

Thanks for following the series! I’m glad you enjoyed them, they were fun to create! ~Ryan

[@RichardSandstrom1163]

Great Educational series on CAN networks! Thanks for your time and work you put into helping teach people a better way to look into diagnostics of these systems.

[@treyinok]

DANG! This process has been fun to watch. Thank you for sharing your expertise on this topic. Outstanding job on the whole series. If you want to continue on other vehicles/systems, I'll be tuning in just as intently as this one... Thanks again!

[@GoTechTraining]

You’re welcome! Thank you for the kind words! It means a lot to hear these kind of responses! ~Ryan

[@salvadorgutierrezr5914]

Great classes and good explanation Ryan and thanks for teaching 🙏God bless you

[@GoTechTraining]

Thank you for the support! I’m glad you enjoyed the series! ~Ryan

[@Bobbygale121]

Amazing 3 part series. Many Thanks -- A BIG help for this old timer. More can videos would be greatly appreciated !!!!

[@GoTechTraining]

Thanks for the support and reaching out! Glad you enjoyed the series! ~Ryan

[@chrisclark6044]

Amazing group of videos. I am blown away at the teacher and how he explains things. Man, I will be saving these for later watching and to send to other junior technicians. Also, lol that Suby was sssoooooo clean hahahaha. Man if every vehicle we had to work with was this clean and what not, everyone would be a tech.

[@kalonjigittens9461]

yes bro , cant wait to watch this , your teachings is truly epic , keep the classes coming , really appreciate the knowledge .

[@GoTechTraining]

Much appreciated, thanks for commenting and supporting the channel! Stay tuned for more ! ~Ryan

[@billchadwick2890]

Excellent 3 part lessons. You also did most of the testing without reverting to expensive tools that most vids feature. This is so important for us non-professionals needing to trouble shoot.

[@OR-River-Rat]

Excellent culmination of all the information and wisdom you'd shared in Part 1 & 2. I feel like I learned 15 years of information in 1 hour. Thanks!!!

[@marcoclaassen5657]

very good video,especially connecting a extern resistor in at the end is epic.didn't came up in my head before.

[@DananjayaKasunDK]

Awesome series, Ryan! Didn't miss a single second. When I first started watching, I had no idea about CAN bus. However, you managed to open our eyes and help us learn everything from the grassroots level. Thank you very much for sharing your knowledge, experience, and time with people across the world. 👌 - A guy from the other side of the world

[@alim.966]

great way of teaching. thank you

[@GeminiSeven43]

Thank you so much for the step by step instructions and for showing what not to do as well. I have seen many videos that go through this but yours lays the foundation for why in a way that doesn't "Over-Tech" some of us weekend techs whose eyes glaze over during the phd lever stuff. As a industrial maintenance tech I work with Profibus but since I am not an electrical tech I appreciate these videos that help demystify the black art of communication. I would love to see more cars like these taken through and fixed and look forward to seeing more of your video.

[@jesusescamilla1864]

so great!!! thank you for taking time and give away all these knowledge, God bless you

[@GoTechTraining]

My pleasure! Thanks for checking out the video! ~Ryan

[@10malabdullah10]

This is one of the best can bus video

[@benthleydorcin6160]

Honestly excellent. Easy to understand even funny at times from part one till three. lol. Thank you sir.

[@wentzelnel7723]

Another solid lesson down. Tank you. Brilliant lesson and practical application of the previous lessons.

[@GoTechTraining]

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

[@coycarlson4979]

They brought this Subaru to you because you are an ACE automotive electrical technician 👍🙂 MANY THANKS for sharing your knowledge . No doubt - If one wishes to repair todays modern vehicles - they must learn and understand what the information you are freely demonstrating / teaching in this video ✌️✌️✌️

[@ThunderbirdRocket]

Thanks ! This is making sense due to this fantastic series of lessons ! You have a real gift for coaching !

[@GoTechTraining]

Thank you so much! I really appreciate you reaching out ! Glad you enjoyed it! ~Ryan

[@testuser3167]

Thanks for posting this entire series. I'm a DIYer, facing odd issues on family member's cars with communication loss popping up commonly, and while I was aware of Can bus concepts as an electronic hobbyist, I never really put much thought into the network segregation to improve reliability. I'm also a bit of a hobby roboticist, and now, I'm more comfortable with both troubleshooting automotive problems, AND I can re-work some of my past designs for robotic networks to eliminate the "house of cards" reliability issues you mentioned!

[@paulbrezina2642]

Excellent series on this subject, I will be encouraging all of our techs to watch! One comment on your technique for checking CAN line short to power using continuity to pin 16 of DLC with the battery disconnected. In checking this way it will show a short to any 30 feeds but this test excludes any possible short to power to the fed side of any switched power circuits.

[@borjgon]

I watched all 3 videos and im gon a rewatch them so much knowledge bro

[@GoTechTraining]

Sweet! Thanks for checking out the series! ~Ryan

[@robertmobileman8304]

awesome case study , great video step by step ,including wiring diagrams. good job

[@GoTechTraining]

Thank you for reaching out and Checking out the new video! ~Ryan

[@tonyratajec6028]

Excellent tutorial and demonstrations. Thanks from Darwin Australia

[@MichealOpwonya]

As an Auto Diagnostic Technician am very much delighted with your wonderful lecture on this this topic which is center of vehicle electrical diagnosis. Congratulation parting deeper CAM Bus knowledge.

[@rgilmore28]

Thanks for an excellent video series explaining the simple yet complex CANbus network system that run our cars. Great seeing someone step by step breakdown the wiring and network topology of connector found all over these vehicles, and going after a connector and skipping it because it's too deep in the console. Don't shorten the video just because it's not going to workout. Only take apart what you need too when you need too!

[@tonykinser2678]

Followed all 3 parts got a lot out of these thanks

[@GoTechTraining]

Awesome! Thank you for following the series! I’m glad you enjoyed it! ~Ryan

[@geovanybonilla2244]

Hello Ryan, I really enjoyed the classes, they were both excellent in theory and in practice, you are an exellen insructor , I learned many tips that I will put into practice. Thank you

[@GoTechTraining]

Awesome, thank you! Glad you enjoyed the series! ~Ryan

[@mikechiodetti4482]

Thank you Ryan for all the work and effort you put into this series. I know I need to review the first two again to put it all together, but this helped to understand the "How to"s " when diagnosing communication problems.

[@GoTechTraining]

Hey Mike, You’re welcome! Glad you found them beneficial! Thanks for checking out the series! ~Ryan

[@marksakeni7973]

Hi? Am from Africa Zambia in particular,and I would love to send you flowers for your extraordinary efforts to make your lessons teacheable🎉🎉🎉🎉🎉.

[@emmanuelrobert1216]

Ni darasa zuri,nimependa ufundishaji wako tangu sehemu ya kwanza ya darasa hili hadi sehemu hii ya tatu,wewe ni mwalimu mzuri na kiukweli nimeelewa vizuri.... Ahsante sana kwa darasa hili na MUNGU akubariki

[@SchrodingersBox]

Might have been a good idea to check terminal resistor in PCM itself at pins A58 and A45 just to be 100% it isn’t a pin connection issue but evidence was overwhelming anyway.

[@GoTechTraining]

Yeah it still couldn't hurt, I would also like to open up the module and see if there is any visual damage ~Ryan

[@Danlyman2010]

Yeah what about piggybacking a resistor right there and hook the ECM up and see if it actually still works and it was just the resistor. You could have saved somebody a lot of money or at least a do it yourselfer that didn't need to change out the whole ECM.

[@faustogonzalez8397]

Awesome , thanks so much, definitely learned a lot and feel so much more comfortable and confident approaching CAN problem issues. Keep up the great work Bryan !!!

[@gmtech2012]

I am halfway through the video when I write this. My main gripe about testing networks is, sometimes the modules are BURIED in spots where you have to remove a lot of stuff. And that presents 2 problems : 1- You have to adjust your diagnosis time to account for gaining access to the modules to test. 2 - You have so much stuff removed that now you can't hook up to the circuits and roadtest the vehicle. Great video series though!

[@sbcandmagnum]

I've been studying diagnostics on youtube for a while and felt like i got nowhere. just watching these 3 videos i've progressed. Great job .

[@GoTechTraining]

Great to hear ! Thank you for following the series and good luck on your training! ~Ryan

[@dannykapito6667]

I thank God for finding you and your channeĺ

[@williamsmale4018]

Excellent presentation and very helpfull

[@jharrison6557]

fantastic class...im glad i stumbled across this, completely by accident too, but i watched all 3 videos. some of these CAN bus classes can go way beyond the scope of what a technician needs to know to successfully diagnose a CAN issue, but every bit of info in this series is relevant. well done

[@johnshinski2994]

Such a great series on CAN bus. Thanks

[@leomcalla29]

Really, really good video enjoyed every minute of it. Thank you so much for your clear , timely interesting and informative presentation........great job!!!!!!

[@GoTechTraining]

Glad you enjoyed it! Thanks for commenting and showing your support! ~Ryan

[@PeterCompson]

🙏🙏just fantastic I’m 69 & been found CAN a long time This is the explanation I’ve always wanted. I’d ask product instructors & be told by them honest enough to be honest ! (sorry I honestly don’t know the manufactures don’t tell us) I’ve even witnessed product instructors say ! You can only throw parts at it until it works 🙇‍♂️ I’ve been told by customers ! They fitted 3x Parts until it was fixed but charged for all 3x parts due to cost of removing them & Now the warranty bag is broken, we can’t re sell it 🤷‍♂️ Many thanks 🙏🙏

[@owenmiles5155]

As a computer programmer looking to understand CAN on EVs it was very helpful. Thx

[@RandyFromBBlock]

That was GREAT. Thank you. I am trying to solve an intermittent communication issue on a single CAN bus and this series is a great help for my understanding. Thanks again !

[@hansvanrengs2642]

Thanks Ryan, great serie on CAN-BUS

[@GoTechTraining]

Thanks for watching! ~Ryan

[@JohnDoe-wv5hv]

Excellent info! Thank you for taking time to make this series.

[@qaissaljumaily5661]

Thank you so much and your 3 parts series was excellent. .

[@goaladventurers1806]

Thank you for your mentorship and efforts in teaching. You are doing an incredible service.

[@odishoodisho4904]

Great job thanks for sharing your experience

[@GoTechTraining]

My pleasure! Thanks for watching!

[@tracydiller9378]

I Subscribed a few years ago and these video series are over the top. Keep them coming much appreciated.

[@GoTechTraining]

Glad you like them! Thanks for watching and following the series! ~Ryan

[@dangable2889]

Im a field engineer recently forced out of avionics career reinventing my self as a Marine intrumentation fiekd engineer. These systems are now CAN BUSS. Great video...and great view inti all screen displays. So is the ECM openable for resistir repair or is it sent back as a core return for factory repair? Last guestion is a source for the test lead adapter kit. Wonderful tutorial!

[@GoTechTraining]

The ECM could be repaired by the right person. There sealed up really good. Under most circumstances it will be a new computer with a possible core. Thanks for reaching out and watching the video! ~Ryan

[@IFixIt950]

Awesome, methodical explanation. I am a computer and electronics tech, and this is what proper troubleshooting is in modern day electronic s. Very easy to listen to and follow. Keep up good work..

[@1979royalknight]

I have learned from your video. Now I have a better idea what to do to find out why my memory seat on my 2012 Honda Accord is not saving the memory and running the battery down in a couple days parked. Keep up the good work.

[@GoTechTraining]

Awesome! Good luck on your diag Jeff! ~Ryan

[@mustaphahammadi208]

Thank you so much for your rich and deep explanation.

[@eldgenb]

I'm learning a ton! I'm a hobbyist thinning out a body harness for my LS swapped F100

[@GoTechTraining]

Sounds like fun! Thanks for watching ! ~Ryan

[@mantekbhogal7501]

ultimate knowledge sharing

[@thegettingoveritguy7266]

Excellent training well explained much appreciated!!!!!!!!

[@naushadali95]

Sir Very excited to watch this video.i dont want to miss any video.

[@GoTechTraining]

👍👍 See you at the premiere! ~Ryan

[@jesseblanquel7189]

Sir, I want to thank you for your dedication and passion to perform these types of educational videos you are providing us with. I am an educator as well, and your material is going to help many young adults, who are in the process of recovery from past bad choices, and today they are looking for an importunity in my nonprofit, so they can better their future. Thank you Sir again, and have a blessed day.

[@michaelgalvin1024]

Great, my class thanks you from down under

[@GoTechTraining]

Of course! Thanks for tuning in! ~Ryan

[@fishonnelson2353]

You did an excellent job here Sir!

[@Mechaniclyfe]

Awesome video for those both in experienced and experienced, well explained! And learned a bit along the way thank you

[@GoTechTraining]

Glad it was helpful! Thanks for watching and reaching out! ~Ryan

[@nickayivor8432]

Can't wait for this tutorial once again. Thank you From Nick Ayivor from London England UK ⏰️ 20:59pm Good Evening everyone

[@GoTechTraining]

Awesome! Thank you Nick! ~Ryan

[@lawrencehalpin6611]

Thank you for a great explanation of the can bus. I am sure you are educating a great number of technicians.

[@rider547]

Great video, very informative. A couple of notes however, at 40:54 and 42:05 you were referring an open circuit as “zero” resistance when it’s actually infinite resistance (open line). I see this all the time when I’m teaching my electrical courses. Thanks for the video! I learned many things about these networks! 👍🏻

[@GoTechTraining]

You are correct, thank for reaching out and checking out the video ! ~Ryan

[@abdulremanehagyccalane6029]

I really liked this explanation of the CAN bus network. no comments, it was wonderful. I really appreciate it

[@jamesreed7358]

Another great video. Concise and no darn music playing in the background. Thank you!

[@winstonhoyte873]

Hi Ryan. I did look at all your CAN Bus. I did like how you explanation. Keep up the good work, Regards, Winston.

[@kalonjigittens9461]

bro i just watched this video , and i must say it was very informative , your skills in teaching is excellent , thankyou and i look forward for more videos in electrical troubleshooting .

[@eacherenkeka]

Excellent three parts series Ryan! A lot to learn. Some mistakes I did in the past I think won't happened again after this series! Thanks for sharing your knowledge, Ryan!

[@GoTechTraining]

Glad it was helpful! I’m still learning myself, everyday I discover something new. Thanks for reaching out and supporting the channel! ~Ryan

[@geovanybonilla2244]

Hello Ryan, I really enjoyed the classes, they were both excellent in theory and in practice, you are an exellen insructor , I learned many tips that I will put into practice. Thank you

[@GoTechTraining]

Thanks for watching!

[@cobbysparks9891]

What a good video! Went by really fast. Great Work. Thanks!

[@iketech1965]

Thanks for your good teaching

[@GoTechTraining]

Thanks for watching! ~Ryan