CAN-BUS No Communication Diagnostic | Resistance, Voltage, Short Circuit, Pin to Pin Test

In this video I explain the CAN-BUS diagnosis step by step. I have a car for this video that has a major CAN-BUS problem, so my scan tool cannot communicate with multiple control units (Engine, Transmission, ABS, A/C, ..), so I explain how to start the diagnosis on the CAN-BUS from the more accessible points to find the problem. I explain how to test the CAN-BUS resistance, how to test the CAN-BUS voltage, how to test it for the short to ground, then how to narrow it down to isolate the problem area for finding it easier. I also explain the CAN-BUS wiring diagram.
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Disclaimer:
Any information contained in this video is just the understanding of “Automotive Diagnosis: Cars Repair & Training Guides” and it is not an official guide or reference, so everything provided in this video is just a share of our experience and understanding and they are provided as a courtesy for your reference only. So, if you are using any part of this video, use the information at your own risk. We highly advise you to check the manufacturer owner’s manual before performing any act of removal, diagnosis, inspection, or repair on your car to know about what you are authorized to do on your car, what the correct and legal procedure is and what risks might be involved, also viewers are strongly advised to consult a licensed person before any sort of inspection or repair. Due to the factors beyond the control of “Automotive Diagnosis: Cars Repair & Training Guides”, we cannot guarantee against improper use of information or tools or systems, or the procedure provided. “Automotive Diagnosis: Cars Repair & Training Guides” disclaims any damage, injury or loss caused by your decision to follow the steps provided in this video.

[@AutomotiveDiagnosis]

You might be interested in watching the following video too: CAN-BUS Explained | Everything You Need to Know About CAN-BUS | CAN-Bus Diagnostics & How It Works kzbin.info/www/bejne/mKfceatjeJeLnNU

[@sollykhan2385]

Thank you for posting this fantastic video, i followed it all the way through, as i have a very problematic car here to solve, so now i will get a 'Can' (of cola) and take the 'Bus' HOME 🙂👍

[@user-rc2yw1bc9f]

I love every single diagnostic video in this channel, thanks

[@AutomotiveDiagnosis]

Thanks for watching the videos and supporting us.

[@jeevanram7148]

Good information ❤❤❤

[@AutomotiveDiagnosis]

I’m glad you liked it

[@Alfon-hz8nw]

Absolutely brilliant

[@AutomotiveDiagnosis]

I’m glad you liked it

[@nadeeramaduranga5314]

This is impressive. Today i changed the gateway module of vw tiguan tsi which is not communicate with all the modules except instrument cluster.

[@AutomotiveDiagnosis]

Thanks a lot for sharing your experience.

[@arthurfricchione8119]

Terrific video and explanation . Thank you for sharing 👍

[@AutomotiveDiagnosis]

Glad you liked it

[@King21114]

Thank you so much for this video

[@AutomotiveDiagnosis]

Thanks for visiting the channel my friend

[@alrifainidal]

Thanks for the time to show us the diagnostic CAN BUS

[@AutomotiveDiagnosis]

Thanks for watching

[@alrifainidal]

@@AutomotiveDiagnosis CAN network is my lovely diagnostic it gives a challenge to diag. I hope I can see more videos like this

[@manoramachandran9192]

❤❤❤❤

[@AutomotiveDiagnosis]

Thanks for watching

[@amarabdelli487]

Great video thanks for sharing

[@AutomotiveDiagnosis]

Thanks for your support

[@rjeromej8149]

Hmmm, decent test plan, but it is 2024; invest in some tools and equipment, e.g., Breakout Test Lead, OBDII Breakout Box, Oscilloscope… I have seen too many misdiagnoses when individuals use the basic test leads that come with the Multimeters. I had a GM Tech trying to convince me that a VVT Solenoid was bad based on the resistance he performed. The test lead probes were unstable in the Connector Cavity when demonstrating the resistance test. The readings fluctuated, so he was under the impression the solenoid was bad until I used some of my breakout test leads and scope in resistance mode, demonstrated the resistance was within the desired range, and corrected the engine oil level, which resolved the concern.

[@Dean-ob7fg]

🙏🙏🙏

[@AutomotiveDiagnosis]

Thanks for watching

[@rodvan-zeller6360]

Another excellent video. At 2:27 why does the diagram show PCM and ECM usually they are the same thing.

[@AutomotiveDiagnosis]

Hi my friend. Normally ECM refers to Engine Control Module only, and PCM refers to ECM+TCM. So wiring diagram technically covers both cars with automatic transmission (that we must look at PCM on the diagram) and those cars with manual transmission (that we must look at ECM on diagram).

[@rodvan-zeller6360]

@@AutomotiveDiagnosis Thank you for the reply

[@meassavuth4649]

Thanks

[@AutomotiveDiagnosis]

👍👍

[@donfu2795]

Thanks for the video. Good diagnostics. Do you ever use a scope for CAN-BUS diagnostics?

[@AutomotiveDiagnosis]

Yes, on many cases we have to use the scope to diagnose the CAN-BUS as resistance and voltage inspection might not be helpful. You can watch the following videos in our channel that I used the scope for CAN-BUS diagnostic: kzbin.info/www/bejne/nIfckHiOoLJ-g8ksi=Kr8HT9-nc5RYE4ak kzbin.info/www/bejne/fXXWeJ2eg6ySr9Usi=dcumc8CY5dPMYCRH

[@donfu2795]

@@AutomotiveDiagnosis thanks for this. What I am wondering: in both cases (using a DVOM or a scope), would the outcome be the same: locate a failing module or issue in wiring and then either replace/rebuild the module or fix the wiring. If that is the case, why bother with a scope, if a DVOM will be able to locate a failing module or wiring issue. I am not trying to be contradictory, just trying to learn. Thanks again for the videos.

[@mwangigateiyu1570]

Good information,, can you do a pull down and pull up circuit

[@AutomotiveDiagnosis]

Sure my friend

[@mwangigateiyu1570]

@AutomotiveDiagnosis i wish you could it

[@miroslavmarsalek243]

What program do you use for electrical diagrams?

[@AutomotiveDiagnosis]

For this one I used KIA GDS which is the OEM scan tool which comes with all diagrams, but we have some wiring diagrams in PDF and will provide them to everyone very soon.

[@miroslavmarsalek243]

Super thx.

[@fivefortyeye540i]

So umm... How did you repair that wire? That would have been interesting to see being it's a data wire

[@AutomotiveDiagnosis]

Hi there, luckily there was only a minor issue on the wiring insulation not on the wire itself, so very easy to fix. But in case of having any damage on the wiring on the CAN-Bus, I never do soldering, as I do on the normal wiring, I rather to replace the wire between two ends.

[@mdushaka6403]

Is it possible to check resistance ON CANBUS when the battery on

[@AutomotiveDiagnosis]

HI my friend. For checking the CAN-BUS resistance, ignition switch must be off.

[@mdushaka6403]

@@AutomotiveDiagnosis Thank you very much, I appreciate your quick response. I did not hear you mentioning it or perhaps l missed it🤔.

[@GhostRideR-1985]

not recommended...

[@MahdiVatani]

سلام مهندس وقت بخیر اگر فارسی بگی عالی

[@AutomotiveDiagnosis]

Hi my friend, you can check the following channel for that: youtube.com/@achar10