5 Tips For CAN Bus Diagnostics | Mechanic Mindset

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These 5 diagnostic tips will quickly help you identify if you have a CAN Bus network fault. I explain the basic principles of CAN Bus operation and the steps I take to diagnose network problems. Follow these steps which include a function test, OBD diagnostics scan, basic multimeter checks and oscilloscope waveform analysis to help you diagnose CAN Bus faults fast!

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0:00 CAN Bus Diagnostics Explained
0:42 CAN Bus explained with network topology diagram
2:53 How to perform a full CAN Bus function test
5:46 How to identify CAN Bus faults with a scan tool
9:53 How to identify CAN Bus faults with a multimeter
12:36 How to identify CAN Bus faults with an oscilloscope
14:48 How to find and isolate CAN Bus faults

The Mechanic Mindset channel is here to help you improve your automotive diagnostic skills. We upload regular, easy to understand, automotive training and tutorial videos covering topics such as; oscilloscope diagnostics, PicoScope, CAN bus, waveform analysis and much more! Subscribe to stay up to date!

[seasonedtoker]

This guy went to schooling and mentoring so that we can watch everything explained in comprehensive vids. He should be rewarded

[will-jn]

This is by far the best channel to learn about diagnostics. Most videos are hours long and assume you already know the ideas. These 15 min videos are perfect for people like me just getting into it.

[johnmoore]

absaloutley fantastic understanding and tutorial of the canbus network system, Thanks a million.

[williamsullivan]

Thank you for sharing your knowledge in an easily accessible format. Your videos are easily followed and communicate a wealth of information in a very concise fashion. God Bless You, May You Enjoy Great Health and Happiness.

[Umski]

A BMW with indicators 😮🤯😂

All useful stuff - thanks 👍

[ianhenderson]

As a taxi-meter installer lots of helpful information ...I fit can bus interface modules ( speed data) mostly every day ...enjoyed the Video👍👍

[kitcht]

Great vid. Couple of things I learnt. Easy test sing comms test to module to test can connectivity. And the voltage test for high and low can is useful quick test. And using the resistance check. But then using piscoscope to confirm diagnoses using evidence. No guessing! 20 years out of workshop so nice to keep learning and keep hand in. Thanks again.

[xxwookey]

An excellent introduction to CAN bus. Thank you. I shall watch some more of your stuff now as this is all new to me. (I've just skipped forward 25 years in automotive technology, from 1997 - the last year before everything had a computer and a CAN bus.)

[georgedass]

Straight to the point and best knowledge I've ever gathered on can bus systems Diagnosis.
Thanks mate

[waukesha]

Back again trying to freshen up my Can bus knowledge. Fighting with a Bobcat skid steer loader having electrical gremlins keeping it from powering up. Pretty sure I traced it down to a bad display module! Thanks for the good video!

[jordysandino]

Hello sir .
Thank you so much for taking your time helping us out with this type of class.
I’m been repairing cars and never heard this terms I’m learning a lot with you and I will like to learn more I’m very anxious for it .
I appreciate you

[dominictomasi]

Excellent videos! Especially for those with less experience with CAN bus networks like me. I do have a suggestion that might help many of us novices. Can you make a detailed video of what pins on the module harness to tap into with a scope or multimeter to diagnose or test a CAN bus network on say the KGM module on a E series bmw?

[coycarlson]

EXCELLENT INSTRUCTION 🙂 - You are a very knowledgeable technician, many thanks for sharing your knowledge ✌️

[GerardBurkeBurkesGarage]

Nice work mate, I enjoyed the video. Congrats on 10k subs 🎉🎉 Well deserved!

[Alex-dpi]

This is a very detailed video. Thank you and keep up the amazing work!

[annasoderlund]

God Work. Gretings from the cold nordic Dalarna.

[Lambros_Stefaneas]

Amazing video. Very Very good informations.one more video from you, that I learned something more. Well done. Waiting your next, to learn more. Thanks.

[PatrykRElektronika]

Wow, I'm so impressed. You wouldn't believe how many hundred times I had to explain all of that to the mechanic who wants to send me the instrument cluster for a repair due to ie. ABS fault on the cluster but the "diagnostic machine" doesn't say that ABS is faulty, so it must be the instrument cluster. Or because Google says that. From now on I'll be sharing that video with them :)
Just for your information, or rather clarification as I assume you know that- it's not LOW SPEED CAN which doesn't use the termination and has a different voltages, it's the FAULT TOLERANT CAN (FT) characteristic. FT CAN is used in BMW @ 100kbit/s, FERRARI @ 50kbit/s, MB @ 125kbit/s and the "STANDARD" CAN which can go as slow as 40kbit/s is also used with the same speeds of 125kbit/s ie in FORD, JAGUAR, LAND ROVER. It's the same speed as FT CAN on this BMW.

[remotaurog]

Having fun learning CAn Bus, difficult to figure out those IDs but i did see some using wireshark .

[chriswilkinson]

Where abouts do you get your electric diagrams from they are very thorough.
Keep up the good work really enjoy your channel