CAN 101
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- เผยแพร่เมื่อ 26 พ.ย. 2024
- The very basics of CAN systems and basic testing methods using a DVOM and the KTS scope.
1.00 setup & tools
3.20 DLC pinout
4.20 Wiring diagram
5.20 Network and terminating resistor description
7.20 Physical layer checks
12.47 Testing with a DVOM
16.30 Scope testing and what to expect with hard faults on physical layer
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Steve
* Disclaimer: Neither Simply Diagnostics nor Steve Scott accept any liability for any loss, injury or damage to any person, property or vehicle as a result of techniques, tools or methods shown on this channel. Always follow the manufacturers instructions and abide by all local and national laws regarding safe working and environmental hazards*
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will this test work on any vehicle and thanks for the great video
Michael Szweda yes Michael but be aware some vehicles do not have CAN at the DLC and use a gateway module. In this case you have to test at a module. There will be more videos in this series, expanding on the topic. 👍
Good information btw. I am troubleshooting a ford no pcm trans abs instrument cluster communication with our ids scanner. I have power on pin 16 and good ground on chassis and sensor on the dlc. I have a hunch I have one module is causing this. Do I really need a lab scope? Or multimeter
Meter is ok for quick checks, go -no go tests, anything more in depth and the scope is your friend 👍
@@SimplyDiagnostics How do you know if the car has CAN at DLC im trying to work on a 2018 volkswagen beetle
Was great
When I measure resistance between 6and 14 it shows 46 ohms what can cause it?
Thanks
Have come across you’re channel from you visiting the boys in NY. I am Up in Canada and love how this TH-cam brings all people like us gear heads together 👍🏻
The best video yet. No "BS" like the scam mechanics, they don't want you to know this, so they lead you down a rabbit hole, low life's. Especially the dealerships, and those who sale those shorted out ECMs. You are a hero to many!!!
Great video! I always recommend my techs to hook up our scope on good working vehicles to familiarize our self’s with healthy wave forms to allow us identity issues when the fun jobs come in. Thanks
What a brilliant video! I've always been a bit scared of auto electrics, but I feel much more confident. Great presentation skills, keeping the subject accessible. New subscriber. Thanks
I've had to deal with a CAN problem with my own vehicle. I used the Pico Scope, BUT, I could have used the DMM like your video had shown. Thank you for showing that. With all the training I've had, CAN was VERY LIMITED! You're video makes it look easy.
You did a great job on reading CAN signals!!! Been watching other videos not making much sense. You should be an instructor!!! You made very simple to understand.
Hi Steve
An excellent demonstration - clear & concise.
A similar demonstration for the K-line would be much appreciated.
Good on you taking the time out of your day to make informative videos. A couple of pointers tho. 6 and 14 are CAN high and CAN low because of their voltage differences and the fact that their dominant bits change in voltage the opposite way to each other. They are however both in the same speed network. There can be multiple speeds of network ( as shown in your wiring diagram) Referring to the diagram, i would suspect that was one data link connector but it was split showing two different networks on 2 different pairs of pins 9+17 & 3+11. Also some manufacturers such as psa use wire numbering instead of colours. So all the CAN wires in one network will be 9001 & 9002 for instance instead of blue & red or in the case of many VAG vehicles orange with brown tracer and orange with black trader. The interference in the trade wouldn't be because it is bluetooth and is normal in most instances. Completely clean switching is very difficult to achieve.
Enjoyed watching. Thank you.
neeniebob1 exactly 👍 this is the entry level video for a series. Just enough info to whet folks appetite for the topic 👍 glad you enjoyed the video 😁
From Orlando. Thinking about getting a Pico for personal use on my diesel truck and wife's suv. I think that you did a great job of explaining the what, and why. I really appreciate your time and efforts. Best wishes!
Thanks! Learning all I can about CAN This video was a great help.
The fact that while measuring resistance of the network , shorting it to power or ground (earth) didn’t change the readings… I guess this proves that simply measuring the resistance of the network is only part of the diagnostic procedure… I need more training in this .. great video sir 👍
This is really a great video. I've never seen a video truly explain so clearly how to test and understand the CAN network. Hope you put out more videos on the topic. Can you explain the terminating resistor functions? Here them mentioned but never explained. Great video. Artie 👍
I have engine service malfunction on the dash, 2013 fiesta, came on today. No codes, runs great otherwise, so tomorrow I'm checking around. You explained CAN very good. I don't have break out box but I still can check for 60 ohms with meter and eliminate CAN system. Thank You Eddie p
Great demonstration Steve with clear and concise explanation. Also good to see the correlation between the DVOM and scope. Keep up the good work! 😀👍
Many thanks Terry 😁
Birds chirping with a Snapon DVM and Bosch oscilloscope and a Pico breakout box... Man that is heaven👍👍
Thanks Steve, Very informative, I learned heaps from this one short video...You're Awesome.🤗👍🇦🇺
I like how you manufacture the faults to definitely show what happens. Nice approach.
Yes two CAN videos today. Good video. Been waiting for CAN VIDEO so long. Thank you
Haroon Khan you’re very welcome, enjoy 😊 Steve
Thanks. You have explained perfectly for me. I don’t have a scope so I was really interested in the dmm results.
Bloody enjoyed it,for years I have avoided electronic repairs,came across Eric’s channel,then yours,and guess what,after all these years of saying no ,to compcated ,I’m am interested,enjoying,don’t jump to conclusions,prove the fault,9 out of 10 it’s a wire ,big big thanks,keep it up,ps I bought a fiat basket case,so I could put it back together,to diagnose the 1st problem, and I have green crusty on back fuse11.many many thanks,
HI Sarah. Once you know there is a fault, how do you identify the wire or pinpoint its defect location? Any tips?
Great video man. You really broke it down to make it seem easy as cake. Definitely took a lot of mystery out of CAN diagnosis.
The Yota Tech many thanks, really glad you enjoyed it 😁
Excellent Steve. Very well explained. I do a lot of Mobile diagnostic work but occassionally I get a canbus issue which causes me problems. Now, thanks to you, PROBLEMS SOLVED !! :-) Keep up the good work. :-)
Steve, great video, Bosch invented can so nice to see Bosch scope!!
Holy crap this has to be by far the best networking diagnosis video ever. Very very good detail in everything. Is there going to be more. I'm hooked now
Glad you enjoyed it Jason, I'm struggling for both time and content at the moment but winter's coming so I'm sure we'll get to expand on it 👍 thanks for taking the time to connect. Steve.
Best can video I have seen for easy understanding, thanks
Great introduction to the intricacies of the Can system which can get tricky for most people.
Tom OConnor awesome, glad you enjoyed it Tom. Pt2 coming soon. Steve 👍
Cheers Steve for excellent can training, I now name this day CAN SUNDAY after you and diagnose Dan's videos! Cheers my friend, Sandy
sandy anderson awesome 👍
Thanks for your time, this helps out alot starting to see more problems with these systems.
Tech channels don't get the popularity they deserve.
Great video Steve and nice touch with the DVOM and scope while disconnecting terminating resistor modules and short to grd & voltage. Keep the videos coming!
Hayward's Automotive really glad you liked it. I tried to keep this one real world and useful, not just for the scope jockeys 👍
Great video you made it so simple more me to understand. Hope you will continue with the rest of the communication networks.
Thanks for making this lesson simple I can now understand can keep posting videos and keep everything simple
GREAT VIDEO , JUST CURIOUS CAN YOU HELP WITH DIAGNOSTIC QUESTIONS AND GOOD TO SEE YOUR VIDEOS EXPLAINED IN DETAIL . I HAVE A FEW QUESTIONS BUT THAT WILL BE FOR A LATER TIME IF YOU ALLOW PLEASE KEEP UP THE GOOD WORK AND THANKS SO MUCH FOR TAKING YOUR TIME TO MAKE THESE VIDEOS .
8power0 join the Facebook group (links in the description) and ask away. I also have a Tech support service if you look at my page. 👍
I just saw you on WUW with Eric O on the South Main Auto Channel. Very entertaining and fun. First time on your channel. Good Video and Camera work. Good instruction and tips on CAN Lines. As Arnold would say....."I'll be back!"
super cool to see these different scenarios on the scope ..... meter work around also great .... thank you !
Great video Steve! Very hot topic for a lot of technicians. Can't wait for more 😁 Thx! 👍
Thanks Dylan 👍
Jim Nicholson
Good video the breakout box makes it very organized. If I am careful, I can take notes on the measurements on paper and find my link error on 2003 Hyundai Santa Fe.
Thanks for this great video. I see people troubleshooting the CAN network but never a good working system and starting from A to Z.
Would be good to do a video on one with a fault.
Excellent informative video, thanks for taking the time ;-)
Great vid that 👍 Unsure how it’s taken me so long to come across it!
Great professional video on explaining CAN BUS diagnostic. You must be so busy that you may not have time to respond but I have a question.
My 07 Infiniti M35 won't start. After a can diagnostic, it shows low to no communication between the modules.
The CAN Diag result specifies: open circuit on the CAN L of the DLC branch line but sometimes it says short circuit instead of open circuit too so im confused.
Not sure if the modules entered fail safe mode due to that or if they are all fried.
The wiring of the car is big and hidden by things that dont allow to test directly at the CAN L wire.
Question 1: can I trust this result?
Can a bad ground trigger this diagnostic?
Can a lose battery ground cause this?
Your info says 60ohm at pin 6 and 14 if all modules are connected but 120ohm if a module is disconnected and you said if all module connected but still does not read 60ohms then there must be an open / short circuit (hope i got this right)
Question 3: is this info specific to the car you are working on or is it general to all cars?
Question 2: I have access to all the modules on my CAN except the TCM that is inside the transmission.
Question: Any insight on how I should go about this?
Your input will be very much appreciated.
Thank you
Another very good video from you. Definitelly very good automotive repair channel!!!
And good comment section.
Greetings from Serbia.
хвала, драго ми је да уживате у каналу
Hahaha. That actually mean something like: Glad you enjoy digging a hole
with spade... Hvala tebi što si me nasmejao :)
nemanja dzombic oops, I guess google translate isn’t that good then 😂
Thanks, its a big thumbs up from me. Great video and set up.Still getting to know CAN. This helps a lot
Nice 101! Thank you for sharing!
Great and clear explanation in less of 30 minutes!
great explanation. very helpful. keep up the great work amigo!
a very good example of can communication. thanks, sir, great video
Naushad Ali glad you enjoyed it 😁
Steve u make it easy to follow compare to other people on you tube grate tutorial keep up good work buddy u first i have subscribed too thanx
Excellent video! Please do more in this series. Thank you.
Thank you, you simplified it why do training courses make it so complicated and long , i think i get brain drained after 2 hour :(
sir you have a great video, pls continue what you're doing. have a great day.
Next time Most-bus Wednesday?🤣🤣 Great Video Steve!
DiagnoseDan we should do a collaboration mate 👍 I really think our two videos couldn’t have gone together better. They definitely compliment each other and demystify the topic 👍
And I have the medium speed one in the making 👍
Keith DeFazio, looking forward to it!😁 You allready showed it once, in you all can are not created equal Video!
Keith DeFazio CAN for everyone 😁
Simply Diagnostics, We should do a video about CanCan at the Moulin rouge🤣
I enjoyed that video that demonstrated clearly, things in the real world don't always agree with what's written.
Steve what a great video training tool thank you sir. keep making em!!!
I'm was totally unfamiliar with this newer system. I couldn't resist. I had tune in. Great primer in how it works and what the actual signals look like. That breakout box is terrific. I think just about all manufacturers have switched over to the CAN bus system?
Yes, all vehicles are networked these days.
Top video Steve thanks for taking the time mate
Chris Brown you’re welcome mate, glad you enjoyed it 👍
Thanks alot for taking the time to make this video
Pretty straight forward and easy to understand
Good job please Keep ’em coming !
Very nice video man! Thank you for sharing this.
Excelent tutorial! Thank you!
Brilliant Steve and thank you.
Great explanation in simple English
Thanks for getting to the point and not giving the entire history of Can Bus!! Lol ... I mean, most people are looking at it so they can learn how to troubleshoot their car. ;)
awesome i find your videos very enlightening and informative thank you
If one of the modules on the circuit(NOT the ones with the 120 Ohm resisters in)was open circuit would this cause a loss of data transmission?....Thanks Steve very informative video
Simply great video! Thanks Steve
That is one fine setup!
Great video Steve, the singing birds really made it a relaxing watch :-)
Looking forward to more 👍
GRUSS Newton cheers Russ 👍 the garden is a lovely place to be 😁
Simply Diagnostics certainly is, makes a change from a noisy workshop with air guns and hammers banging
This explanation is good on all test procedure or it give short circuit or faulty Ecm.
Great video , but just to clarify do short out using the pin out box with aid of a jumper wire . Showing a visual would of been fantastic .
Absolutely awesome and rare info thankyou very much and many notes written down.
Great Video! Explained Well.
Great explanation thank for the time you take to share your knowledge
gerardo araya you’re very welcome. Glad you enjoyed it 😁
Great informative video Steve, I certainly learnt from it, keep em coming !
Andy Pearcy awesome, glad you enjoyed it 👍
Well done some mysteries solved.
Great video Steve..lots of detail and info...you should do training courses....
Thanks Geoff, I do offer on-site training but it’s not my primary focus. I love fixing broken cars 👍
nice....something to refer to when ya have a questionable waveform.....a few days ago I had a 2009 Subaru with the high speed can shorted together at the underdash bulkhead.....my signal look much different thatn your last test...my waveform looked like a sawtooth and both can high and can low were completely the same....not mirrored!!! something to keep in mind......oh and the can issue I had was technician induced......they taped the harness so tight that they moves the caps on the splices and exposed copper and the super tight tape job crossed them .....actually was a easy find as the tape job didn't hold and was crying for inspection.....great vid simple.....
billmck12345 if you’ve got a screen shot of your shorted network, feel free to post it on our Facebook group. Link in video description. Cheers, Steve 👍
Really good explaination. Thanks for the video.
Excellent how to video.
Thanks. I have to check a farm tractor tomorrow that actually has a CAN system.
Excellent teaching keep up with good work :)
Bro keep up the good work and keep good
thks alot Steve for sharing your knowledge with us hope to see more can ,flexray & most communication videos GID bless you.
Mwesigwa Joel thank you for watching and taking the time to comment 👍 Steve.
Mwesigwa Joel Very few pretty mechanics interested in Can data ?
Tom OConnor why, are they afraid of CAN.
great video steve , very informative , when do you need to do this test .
Say the PCM is shorted. Will it read 120ohm as if the pcm or bcm was unplugged?
Also is a labscope required to check these or just to confirm by display the mirroring effect of can H and L
Great vid some good info there clearly explained
Very good video Scanner Danner said to check you out thank you for the great lesson Brother,looking forward to more info and more great videos
Thanks for coming along Warren, glad you enjoyed the video, Steve 😀
Good Job Amigo !! Thanks a Lot For Sharing
Exselete diagnostic. Amigo. Nice video
Mechanic Technician Repair Glad you liked it, thank you 😊
Oh, Autodata :) I really like their schematics
Hi Steve. I have a Volkswagen T5 2006. And have a fault on the physical network and I’m looking to get a wiring diagram so I can investigate the problem.
Do you know where I can buy one.
Great video thanks again
Both pin 6 can h And pin 14 can low both have ghost voltage/open circuit
Great vid. Cheers.
Nice video Steve.
I'm chasing a U0073 code & vehicle drives perfectly, only noticeable issue is EGR & EVAP monitors refusing to "pass". I'm getting 60 ohms across CAN HI & CAN LO. However, I'm getting 2.2v on CAN LO & zero voltage on CAN HI! Breakout box shows the light flickering constantly on CAN Lo but the light for CAN HI is intermittent. I'm stumped!
You are welcome. Amigo
Mechanic Technician Repair thanks 👍
SIMPLY DIAGNOSTICS, how do you upgrade from a CAN bus 2.0A or 2.0B to a CAN FD? what scanning tool do you use to verify and test each CAN module? When you disconnect a Module this is an OPEN condition, how else can you create an OPEN module circuit?
Thanks for your time! Learnt a lot!
I would recommend to disconnect the battery before testing the resistors !
Great point, battery reset procedures on modern vehicles can be very involved and time consuming. For these simple checks, most of the time, it is enough to wait for the network to sleep. There are exceptions to this of course. 👍
Nice video! Love the dog in the background :-)