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:

[@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

[@jeevanram7148]

Good information ❤❤❤

[@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.

[@Alfon-hz8nw]

Absolutely brilliant

[@arthurfricchione8119]

Terrific video and explanation . Thank you for sharing 👍

[@King21114]

Thank you so much for this video

[@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.

[@alrifainidal]

Thanks for the time to show us the diagnostic CAN BUS

[@manoramachandran9192]

❤❤❤❤

[@rodvan-zeller6360]

Another excellent video.

[@meassavuth4649]

Thanks

[@Dean-ob7fg]

🙏🙏🙏

[@amarabdelli487]

Great video thanks for sharing

[@donfu2795]

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

[@mwangigateiyu1570]

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

[@miroslavmarsalek243]

What program do you use for electrical diagrams?

[@fivefortyeye540i]

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

[@mdushaka6403]

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