Hats off to Enovation Controls for doing what major OEMs would refuse to do because it would hurt their bottom line in service repairs. This is exceptional customer service!

It is much easier to understand when you can see the system as a whole. You are a great teacher. This knowledge is worth more then gold.

Great video, exceptionally clear for an introduction to CAN bus. Troubleshooting scenarios were great information for just learning the characteristics of the bus connections vs it’s comms.

Best video ever about CAN systems! God bless you!

i studied can troubleshhoting class for a sort of hi tech devices .... your are a SCHOOL yourself .. u helped me much pin point instead of replacing pcbs as trials & error.. all the best

Theory of operation is always useful , troubleshooting techniques are indispensable . Thanks for giving both , and practical points too for using a DMM as the primary analytical aid.

This is the best educational video on CAN bus I've ever seen. Thank you for explaining in such good detail

This is what I have been looking for for years, nobody explained it better than this.

Excellent content, thanks for putting it together in a concise well edited video.

Finally, a video that explains it best. I retired from a rf tech working on radio equipment so have kind of a clue. This is very helpful.

This is great, nice simple introduction to the CAN system for someone like me with long experience of servicing good old fashioned analogue electronics and old simple classic car electrics. And the signal reflection action is probably a bit like what happens when setting up a CB radio rig where you get too much RF reflected back down the cable when the aerial, or antenna, is not properly tuned. And this system reminds me a bit of the digital control systems for model railways where just one power supply can feed all the track but each train, or locomotive will only respond to it's own control commands sent through the same tracks as they each have their own decoder fitted which are all different and only recognise their own codes. But of course even with the CAN system there will still be the age old problems of intermittent connections often caused by corrosion or vibration over time etc. and in my experience with some more modern vehicles I've found that some wiring connectors are ok until they're unplugged and they sometimes start playing up and go intermittent after they're reconnected so I suppose that can happen with this system too, and some more recent vehicles have far too much stuff crammed into too small a vehicle making some wiring well nigh impossible to get at.

This is an excellent demonstration, thank you! Now I see why they call NMEA 2000 a modified CANbus system. Thank you, sir.

Love it! Clear and condensed troubleshooting guide. Must see for a DIY person.

One of the best CAN bus videos I've ever seen.

Great explaination and easy understanding. Spending 18 minutes to watch your video can save many working hours for us. thanks alot!

This is an absolutely fantastic demonstration. Thankyou for spending the time to make this video.

Thank you so much, mister. You explained and covered this topic properly and answered majority of the anticipated questions.

I must agree! Great video. We see this in all the vehicles we integrate electronics into

I kind of understood can bus in automotive field, but this knocked it put of the park. What a great video and explanation for a not so smart guy like me. Thanks!

Excellent tutorial! You explained the CAN bus and trouble shooting so clearly - Thank You!

Great video, now I have a better understanding of this system. Thank you!

I've had battle with bad connections on our A&B Devicenet system on a rolling mill. I finally found a good spot in the middle of the loop I can break into and hook up my meter. I use a Fluke with a detachable face and I take the meter face with me and go around to the different components on the loop and lightly give each one a tap and watch the resistance to find the culprit. The Profibus is similar and they use a higher value termination resistors. They use plugs with a D-connectors at the nodes that also have a switch in the plug to switch in or out a termination resistor and sometimes the switch can get dirty and cause problems. I hook up the meter and tap the connectors to find the offensive plug. Your troubleshooting example is spot on. Very good indeed. There is still a lot more for me to learn about these systems.

That demonstration board is really neat, thank you for posting this.

Super demonstration of the CAN Bus system. I'm electronic automobile master technician and most of the content would apply to car and motorcycle as well. I'n car, the resistance are included in some device such as ECM and cluster or fuse box.

Nice breadboard/posterboard design. Has just the right components! You put a lot of thought into this!

This is absolutely fantastic! Short, informative just as it should be. Thanks for your time and effort making this! It’s appreciated! 👌🏽

Thanks so much for this. I am actually an automotive technician but the principles of CAN are the same in our industry.

Simply awesome, chased a can bus in a Nissan for weeks because someone cut can-high installing a stereo, wish I had this info then, thank you

Awesome video!! Thanks for sharing. One thing you did but didn't mention was when measuring termination resistors you had the power off. If on and communicating this can throw reading off. So make sure power is off for termination resistor measurement.

excellent in terms of the experiment made, verbal communication, content everything

Thanks for your effort to put this video, really very useful information about CAN.

Thank you, great tutorial on troubleshooting CAN Bus problems.

Thank You so much sir for this well explained presentation video. I gained knowledge and understanding on how to check and troubleshoot the CAN Bus.

Let me add my voice to the chorus: Thank you! (My interested is automotive) Not to detract from that, there is one thing I think is "missing" and may be confusing to some students. It would be good to run a third wire below the CAN pair showing ground going to all the units, and to which the CAN signals are referenced. ( in fact power might not be bad to show as each of those devices is connected also to power and ground). The problem is that in conventional circuits (non CAN) a pair of wires (particularly a twisted pair) carries one signal, the voltage in one being in respect to the other. In CAN, each wire caries a signal with respect to ground AND also with respect to the other. One signal being the mirror of the other (with respect to 2.5 volts) . While in trouble shooting one looks at the individual signals, each device actually looks at the differential signal. The reason for all this is that it is a very noise immune topography. Noise that gets into one signal also gets into the other, and thus the difference signal is unaffected by noise. BTW, the reason the signal rides on the 2.5 volt carrier is 1) it is tricky in the electronics to handle signals that approach zero (zero crossing issues), and 2) at low and zero volts, no current is carried. The higher the voltage, the higher the current being pulled into the termination resistors. The higher, the current, the greater the signal is with respect to any inducted noise signal. Inducted noise can create high voltages in a high impedance line, but since inducted noise is of low power potential, it produces relatively little voltage in a low impedance line. Thus CAN architecture uses four tricks to overcome noise 1) low impedance transmission (on the backbone), 2) differential signal pair transmission, 3) A base line offset from zero and 4) twisted pair transmission line (decreases inducted noise in the differential signal) . Thanks again for you excellent tutorial !

Very clear and concise presentation.

Nice thorough explanation. Thank you! Great job!

Brilliant video. Clear layout and processes. Well done !

That was as close to a perfect presentation as I have ever seen. Thanks!

The troubleshooting shortcuts and wrong impediance is very good. Thank you

Excellent video, thank you. I have a Marklin Central Station 2 controller unit for my G-Scale model railway which uses a CAN Bus and Gateway to control the trains and various accessories via Decoders, such as points (switches) and signals, model lights, motors, etc. This has really helped me understand how my bus should be setup, and the purpose and use of terminators (snubbers?), and how stubs (track feeders) are used to connect at regular intervals to the centre of electrically isolated sub-sections of railway track, which in so doing also helps to isolate and more easily find bad track connections (caused by weather/corrosion), and reduces bus data reflections. Plus you show how to perform diagnostics on it all. Really VERY useful and well taught. Thanks, Jim

open and more advanced education .... i would like to thank so much for your amazing explanation.

This was a great presentation! Much appreciated!

A very well scripted and presented video, kudos.

Thanks..one of the best explanation I have come across

straight to the point ..good video ..this is a must see video for can bus diagnostics Tech .this is a fundamental Diagnostics steps

i respect your authority sir. you are very knowledgeable

Happy to see video like this in UKposts ,Thank you

Excelente trabalho. Congratulations from Brazil.

Boils it down to basic multimeter troubleshooting concepts well. Thank you!

Thank you! Simple and clear demonstration!

One of the most concise, well thought out lessons I have seen. Thankyou!

Excellent. Very informative & precise.

Super informative, the demonstration really clarifies everything, thank you!

Great video, very informative and educational well done!

I imagine the ECOM determines priorities for data transmission, who gets to go first so to speak. Highest priority goes to safety concerns, especially in automobiles I would guess. It would be nice to see an actual, virtual setup in a typical modern car.

OMG! Great training! can you do a video on bit stuff errors? how about more advanced troubleshooting topics?

Keep up the good work Dan! You are a God send . . . Thank you!

Very well explained. Thank you for sharing this video

Great video! Very informative and taught me a lot about CAN bus!

This is absolutely perfect! Excellent video, thanks!

The Best explanation! Thank you!

This was very Helpful ! Thank You for this demonstration.

A superb well explained video, thank you.

So helpful!! Thank you so much!

Thank you so much for sharing this great video!

Absolute gem. Exactly what I needed to know. Thanks

Thanks for this video! 3 minutes in and my question is answered 😊.

Thanks for this. This just helped me sort thru CAN bus issue in a Fusion. Saved for future reference.

Wow this video is so well built thank you for the refresh

Fantastic explanation and very easy to follow!

Wow Just Wow What You Learn In Helf Year you Explain Only In 18:08 And Even Better Than The Teachr.Thank You Very Much Very Helpful For Electrican

Been trying to figure out a problem in a Kenworth truck, either its s $3,000 gauge cluster, or a $2,500 cab control module😮 this really breaks down the testing procedure. Hopefully ee now can narrow it down instead of throwing both parts at it.

Wow that was a great explanation. Thank u for your time explaining this

Interesting video, thank you, made easier by having the components neatly laid out. My experience of trying to diagnose CAN Bus problems in the real world of a complex car is that are just too many potential failure points, everything is inaccessible and fault finding becomes very difficult.

highly informative. Appreciate the explanation while using the bare minimum tools as well. I already played the process of elimination game to figure out the short to Gnd on CAN bus. but knowing how the CAN voltage responds to specific conditions is helpful AF

It is all very easy to understand and "trouble shoot/repair" on the demonstration board. The issue is when the circuit is buried in the deepest recesses of the vehicle, inside wiring harness bundles and 20 different modules are on line... and any cut, crimp, or corrosion anywhere in the circuit or any malfunctioning module can disrupt the network. The difficulty is in finding that damaged point in the circuit.

Thank you for such a wonderfull video on Can bus.

Such an elaborative video. Thank you so much for this.

Nice troubleshooting. Thanks for putting it here.

Great video, clear and easy to follow

o-my... this is obviously a wonderful troubleshooting video...👌🏽 there are more-N-more CAM devices being installed on the factory floor connected to PLCs...😉 thanks a lot. 👍👍

have to say canbus on vehicles have given me fits. this helps me understand trouble shooting a little better!!!

Great video

Amazing presentation Sir it helped a lot.Thank you so much.

Good explanation. Loved this.

Thank you sir.. BEST KNOWLEDGE on CAN BUS .

Fantastic explanation. Really appreciated!

Thanks for explaining it experimentally. 😊

Thank You so much for this video lesson!

Simple and effectively explain thank u very useful

Fantastic explanation - Thankyou !!

Great content! So helpful. Thanks!

👍 I am very glad to have learned from this presentation. Thank you, 🙏

I can't believe no one has commented on this video.....Great job on simplifying the CAN Bus system. Thank you!!

🙏 thanks for this worthy contribution!

Excellent peace of work

Thank you so much for sharing.

I can see the benefit in layout and troubleshooting using stubs, but electrically I think the daisy chain approach was how the system was envisioned. In some automobile installations it looks like the stubs are longer than the backbone, but it appears the bus is not corrupted beyond use.

Nice video - most people struggle with CAN bus troubleshooting. If Enovation Controls / CANcapture are interested -> It would be great if the CANcapture software were a more active product. No new features or bug fixes have been done in >8 years. The ECOM and CANcapture software work very well and have great features for the money. However, not updating the manual to include the application builder, no support for multi-plexed messages, bugs with the panels, and no controls with the GUI (keyboard presses can be recognized as triggers; indicators only - no GUI controls such as slider, button, etc.) mean either you become very comfortable with the Angel Script language or you write your own application in a different language and use the hardware. The lower priced "locked" hardware is a great alternative if you package a rudimentary application with the tool or write your own application. The support forum was strangely hosted by FWMurphy (now part of the same company), but then the forum seemed to go away. A support message from the company indicated the product was still active. However, no new releases, etc. would seem to indicate 'active' means you can still purchase it and it has not been discontinued.

Thanks for the info, it is very useful.