How to test a CAN bus network with a meter

[@ManuelRodriguez-wx2lb]

As a instructor at a community college very well done sir. Great Job

[@quicklooksentertainment3217]

Simple and Right to the point with "Applicational Scenarios." Best teachers are those that understand how to deliver the message to the student. You are one of them. Thank you for making this video.

[@DFWAuto_Hack]

I don't know how you got into this but you just gave hope to a guy, ME, who gave up on fixing his 07 M35 sitting in the parking lot for almost 2 years now. You explained this so simply and with steps that I will watch this video again and actually make notes before going back to my car. symptom on my car: No crank no start 95% of the time when the car is happy, usually on a very cold day, it cranks very well but won't start I connected a consult 3 to scan the network (lucky to have one I paid a lot for). It shows multiple miscommunication between the computers. I have U1000 in ECM and the TCS. I have already removed all the computers on the CAN; The only I cannot get to is the TCM in the TRANS. If I connect a snapon scanner or any scanner able to see all the computers; the only computers I am able to read anything on are the main 4; PCM TCM ABS & Airbag. any other computer will disrupt the scanner and say no communication. example: Intelligent key module, BCM, Anything else (Snapon cannot communicate with a code are you sure it is connected to the DLC? ) Last thing is when I prompt the Consult for a NETWORK DIAG RESULT, it gives me a voltage and specifies this : OPEN CIRCUIT OR SHORT ON THE CAN L OF THE DLC BRANCH LINE. My question is: How can I trace this CAN L wire and know where it is broken. How can I practically do it? I have the multimeter, the breaker box, aligator clips, a power probe 4 and an Open short finder (the one that makes a lot of noise; not very good at using it). I feel so close to the solution; Please if you come accross this and can answwer my question and add anything you think could help ID really appreciate it. Meanwhile, I AM ABOUT TO TAKE NOTES LIKE A STUDENT LOL. THANKS IN ADVANCE

[@Barryd57]

This was sooooooooo helpful. I bot a $30 breakout box and determined that my CAN network was working by repeating all of the tests demonstrated in this video. I connected my $20 DTC code reader to the breakout box and it reported that it could not connect to the HVAC module. Via this process, I avoided hours at the dealer $165 per hour.

[@brandonmckenzie2256]

By far the best teacher on KZbin simple and straight forward

[@ericbaker9688]

This is the best way of explaining Can bus system. Instead of dudes jumping on videos and talking in Mechanic terms that's confusing and long. Trying to explain how their fancy equipment work and what it does with out breaking it down like this dude. I must've seen a thousand print outs on here explaining wiring at what goes to where. It means nothing if you can't understand it or what's what. And most don't bother telling us there's a network involved. Proper breakdown here!

[@manuelmartinez8741]

An explanation clear as water. Thank you!

[@hammerhead6537]

You managed to do something that very few people have the ability to do, and that is, explain the Canbus System in a very simple and clear way. Excellent!

[@israelayemoba]

I don’t really have something better comment than what people have about this video. It’s completely superb and done

[@timmer9lives]

Not only a great explanation in very simple terms... But also using the most simple test instrament to check the Can Buss system- A Volt-Ohm meter.

[@sollykhan2385]

'CAN' anyone ever get their heads round why there are near Half a Million Views,and yet just a few who bothered to post a comment of appreciation with Gratitude, Thank you for an AWESOME video, no nonsense straight to the heart of the matter,Simple systematic and well thought out methodical tutorial, Legend. 🙂😇 Please post more.

[@louiscairo6172]

I was having a network issue on a vehicle in my shop and needed this refresher course. I was able to quickly diagnose the issue because of your video. Well done..thank you sir

[@MRDIAGNOSTECH]

That's great news!! Thanks for the feedback.

[@droneservices8993]

This is one of the best troubleshooting videos I have seen. It helps a lot, now I have a starting point.

[@lamtran915]

This is by far the best video to explain such complex system in the most simplified way I've seen. You've saved me from a huge headache. Thank you!

[@philipeastham1607]

Brilliant tutorial. I’ve a no crank no start at the moment but needed to know if I had any shorts. I’d tested my resistance which was good but didn’t know about the difference in voltage between high and low. I’ve now tested this and I’ve got what I should have so I can move forward and test some more.

[@natk5569]

Thank you so much for walking through this. I'm having a communication issue with my ECM and this has been the clearest, in depth explanation I have found!

[@sefofatai6618]

Thank you. This is the first time I finally understood the can bus system after watching so many others. You are the man. Keep up the good work you are doing and don’t listen to any negative comments. Walk around it and keep on.

[@MRDIAGNOSTECH]

Thank you!

[@Engineer9736]

Fiiinally a video that goes further than "replace the fuse". Mr. Diagnostech is a hero 👍

[@steadyeddie7453]

You cant beat a simplified drawing to teach the CAN bus. Very well done. I would like to add one thing. When using the multimeter the voltage and resistance will auto-range unless you change it. So, for example, you may be reading 12.50 millivolts instead of 12.50 volts. If you aren't paying attention to the digit after the voltage numbers you could end up chasing your tail. Same goes for resistance readings. I (now) always press the range button to manually set the meter to a specific range like 0-20VDC. Same goes for resistance readings. Thanks for the video.

[@AbstractSurrealist]

this is one of the best and simplest lessons on CAN bus network problem i have ever watched. Good job sir

[@ronenhuri5824]

I think I never saw such a high level of KZbin lesson of a car diagnostic explanation... shapo

[@AndrewLoo-dp9tw]

hands down the best videos on networking. I'm getting close to 10 volts on Hi and Lo lines... still figuring it out... Thanks for the video Great work

[@z34diaz30]

This guy was my smog professor 🤟🏼

[@markt9263]

You have a great talent to explain this topic in such a clear, concise manner. Thank you for taking the time to educate us on this system. I am heading to Amazon to find the breakout box.

[@tommyduris3044]

Great video mate hats off!! Exactly as the last comment says, you’ve managed to not only show what it’s supposed to be in every scenario but also explain it in a very simple way making it very easy to understand. Super effort. 👌👍

[@Keepitreal260]

You are by far the best person on here to explain in one video I couldn’t find in a collection of videos just to sum this up. Thank you!

[@haho5289]

you are the best .I've been watching for CAN system explanation many times on you tube but they just make it worse and no sense .Thank you very much for your best explanation .

[@supskymysiv]

Seriously has made it seem as simple as it really is. you sir are a great instructor. I've been in the auto industry 18yrs and you have taught me more about CAN bus than anyone I've ever met. thank you!!

[@kohlerjeffries2798]

U should be a teacher. Best explaination EVER!!! GOOD JOB SIR

[@junsamia5962]

He's an instructor at LA TRADE TECH. He was of my instructor and very fortunate and grateful about it.

[@MichaelSmith-td7op]

Excellent brother!! You were born to teach that is abundantly clear. Your students are lucky. Keep it up mijo!

[@javedmushtaq3099]

Brilliant. Thank you for your in depth explanation and fault finding walk through. The BEST and simplest video in relation to this. God bless you my son. 🙏

[@richardmontpellier415]

Great video, totally demystified the CAN system, great troubleshooting tips, Thank You!

[@sambitar8448]

Hi Sir, Again, your case study will help Advanced Diagnostic Technician in bringing back to life the network of communication which definitely will bring life into the vehicle to a perfect efficient running condition. thanks a million for your effort.

[@JtotheRed13]

Wow great video! Easily the most simple to follow and concise demonstration of diagnosing canbus systems I've come across.

[@l3yonk408]

Very nice and clear explanation. Thank you, my brother. I have never heard such an explanation before. I salute you deserve applause 👏

[@MRDIAGNOSTECH]

Thank you

[@MarkHopewell]

Thank you for the block diagram in your excellent presentation. This is a very useful abstraction. I've had success filtering and displaying PID data from the ECM, i.e. RPM, temperature, speed etc; However, I've never had success in isolating data from the BCM , i.e. direction indicators and so forth. No matter where I look, I seem unable to find information about how to access the BCM, to carry out more work on that part of the CAN bus.

[@rehanautoelectrician5411]

You are best teacher in this world. God bless you and your beautiful family always

[@joshuawhitely8984]

MORE VIDEOS PLEASE !!!!At this point I don't even care what it's about as long as your teaching. I know I'll learn it!!!. Very very well explained. I have had a problem with my wife's car for years now and I believe this is going to help me find the issue. I bought the breakout box but really hadn't learned how to effectively use it until now. Thank you so much man. Keep up the good work . !!!!!

[@MRDIAGNOSTECH]

kzbin.info/www/bejne/lYWodn2Pmr9-bpIsi=1cT7uiyv0g2Hl5qv

[@rigneyte]

Great video right down to the mm instructions. Dealing w CAN BUS error code right now, this is the place to start. It's almost like you do this for a living, thank you for taking the time to post this.

[@arsanyshehata3287]

I’m dealing with the same thing right now everything that he talked about was fine when I checked so I’m not sure what it could be

[@blueyfi]

Thanks for the awesome explanation, I have a Mercedes A190 here atm, with no resistance across the wires and no voltage either. So hopefully tomorrow I'll be able to find the fault after watching your explanation. Cheers mate.

[@copartflips9416]

This man just help me out big time car been to 6 shops no one can fine problem. I watch this video and fix car in 20 mins

[@MRDIAGNOSTECH]

Awesome!!

[@localflavor1866]

Thanks to this video I was able to diagnose, with confidence, why i could not get a reading from my OBD port and also the reason for "Power Systems Failure" on my dashboard. Thanks a million

[@maheshperera171]

brilliant explanation, my hats off to this automotive expert

[@WD-ti5cn]

Simplified at its best in 16 min! Awesome

[@nattydreadlocks1973]

The best video on the subject ANYWHERE!

[@ingeniousmechanic]

Excellent video, taught me some things I didn't know. One note, on the multi meter, the "O.L", if I'm not mistaken, means Out of Limit, indicating a resistance that is higher than the meter can measure

[@MRDIAGNOSTECH]

You are correct, I noticed it after I posted the video. It meant out of limits.

[@saulorozco5787]

GREAT ingeniero , very simple explanation the best I have ever seen. Now I’m not scared anymore to the automobile nets . Thank you again you got my like and subscription.

[@diy_automotive]

Good stuff! A lot of "techs" are lost when it comes to this. Very well laid out, I enjoyed watching.

[@MRDIAGNOSTECH]

Thank you

[@tnamen1307]

@@MRDIAGNOSTECH sir, can i hack my car i20 to auto lock after reaching 40 kmph and auto unlock as soon as engine is off?? If so, what's the simplest way to do?? Forget about g scan, etc etc. Thanks.

[@tnamen1307]

@@MRDIAGNOSTECH at time 6.05, 2 resistances in parallel of same ohms 120 gives resultant 60 ohms. That's ok. However, voltage reading at HI and LO are different, 2.7 and 2.3 respectively. Sir, please kindly clarify on this. Thanks.

[@MRDIAGNOSTECH]

@@tnamen1307 the Hi side switches from 2.5 to 2.7 and the Lo side switches from 2.5 to 2.3. The meter is too slow to switch at the same rate, so it will give the average voltage. You need an oscilloscope to watch the activity. If the CAN is shorted together you will see 2.5V on both. If either bus line is shorted to ground, you will see 0 voltage. Either short could cause a no communication.

[@tnamen1307]

@@MRDIAGNOSTECH any way of activating auto speed door lock when the car reached 49 kmph through this DLC connector, leaving aside the g scan, etc??

[@joseibarra125]

Sick video, great explanation of tests required for network integrity

[@sankanaulla1200]

Hats off to you brother! best explanation of CAN bus system i have ever come across!! keep up the good work!

[@kevinnguyene3890]

Thank you for sharing this video. Your the best teacher I have seen on youtube!!!!!!!

[@miqbal1981]

the best explanation, unbiased, to the point & accurate, Bro pls keep sharing your value able knowledge with poor guys like me...

[@dorjeet2459]

Thank you so much for explaining can bus networking troubleshoot in a lucid manner. Keep posting excellent video like this!

[@fieldsofomagh]

Must add my commendation to this info video on the vagaries of can bus operation. Excellent explanation on the normal values found in can bus driven signals. The fault numbers are also deciphered and reasons behind these unusual results are discussed.

[@JoeBob79569]

When your car breaks down and you go to a mechanic, this is the type of stuff you expect them to know. But most of the time they just use a scanner, read the codes, and tell you you need a new module or component, whatever matches the error. My local Peugeot dealer tried to tell me I needed a new ABS module ($800) because I had an ESP/ABS warning light on. I drove away as fast as I could, and later figured out that it was a dirty EGR valve causing the problem.

[@sambitar8448]

Hi Sir, you made my day with your technical explanation, very impressive direct to the point and it will make all diagnostics technician job much easier. Thank you

[@johndakin9164]

I think this one of the best videos i have ever seen, very well explained, thank you

[@DJ-tn7vj]

Agreed.wrote down word for word

[@robertz9512]

Excellent explanation with real world examples. Thank you so much!

[@alexreis5530]

Straight to the point or points .Ive been looking so many videos about can bu and i never got it since now ! Appreciate

[@TrungLe-zx1sy]

Thank you for your video , your are the best teacher you teach us so clear so ez understand...

[@MRDIAGNOSTECH]

You are welcome!

[@garagefiftynine8213]

excellent whenever i watched this particular explanation clip really it is memorable ,ALLAH bless you man ,thank u.

[@Richard-nq3rh]

I think you gave some of the best instructions I've seen so far. great for a novices like myself. Hope you do more.

[@ronslaughterandalice1018]

Just getting into auto electronics and this is simplified perfectly for beginners. Great job and common sense instructing.

[@adventures223]

You are a mastermind what a great explanation you are one of the very few thanks

[@ryans8309]

Good job that helps people out a lot.And abundantly clear and to the point.

[@kalungironald2229]

U did a great job in my career thank you very much. Best wishes from Uganda 🇺🇬East Africa

[@nicholascummings6803]

Awesome video man, very easy to follow , unlike most

[@joselitopeji2776]

Thank you sir for all your videos very helpful and more knowledge for me as a mechanic 🙂

[@heinrichschultz5894]

best explanation i have seen yet.

[@MRDIAGNOSTECH]

Thank you

[@tnamen1307]

@@MRDIAGNOSTECH sir, can i hack my car i20 to auto lock after reaching 40 kmph and auto unlock as soon as engine is off?? If so, what's the simplest way to do?? Forget about g scan, etc etc. Thanks.

[@anuraj5080]

@@MRDIAGNOSTECH great

[@am.b5688]

Technicians always leave some info for themselves! Not this guy. He is amazing. I encourage him to go to Udemy and put it there, thanks.

[@elkarshofyelkarshofy1490]

Best explanation I have seen .

[@jesperhougaard]

Excellent quality tuition - easy to understand first time.

[@teagar3]

Bravo, excellent, intuitive description of the can bus function. I have such an issue, I have power at the DLC at pin 16, and good grounds at 4 & 6. But no communication with the PCM through my Scanner. All the fuses checked out good, and for good measure I replaced the PCM Relay in the Power Distribution box. According to the Wiring Diagram for my 98 F150, both the High Bus & Low Bus are located in the PCM. I didn't suspect the communication problem with the PCM because the Truck Runs. But now if I do the Ohms test, I might discover that one of those busses are bad. Recently I had an Alternator that went bad sending a surge through the electrical system, and blowing a 175 amp fuse, all of which I replaced.

[@rehanautoelectrician5411]

Sir aslamo alykum. Sir you are very beautiful and best teacher. Iam your big fan thanks for this helpful video

[@rsbharley4766]

Excellent video. The best video on can-bus I have seen, thanks for taking the time to share. Cheers

[@stevenlopez9687]

Thank you for your explanation, it's very good, easy to understand, and a nice teaching style.

[@lodhiautos9761]

Very nice and simple explanation. It is easy to understand. Thanks.

[@Grumps5]

Greatly appreciated. Very well done video. Unfortunately this method will not work with newer Fords and their gateway modules, you need one of their expensive special break out boxes to test all can lines. that box is roughly $600-1000

[@amitrai-lk5fl]

I love you Bhai. Maza aa Gaya. We need teacher like you mmuaaah.

[@DJ-tn7vj]

Very well explained and put together. Really help me understand this properly. Thanks

[@ralphbowes1446]

Great video! Very helpful. With your help I found I have a short now to find out where. I have 0 ohms no matter what I unplug from the computer. I also am reading 2.4 volts on both the high side and low side.

[@michealdinkens6447]

Thanks for your time and knowledge for explaining it to make my comprehending motivated knowing that I know now I'm fin to get this taken care of.

[@mohammedcherifi9206]

The best explanation I've ever seen i'm now a new subscriber thanks to this video

[@CarterPerformancePR]

Best video i have seen explaining the can bus system. Keep up the good work

[@cameramanjsy69]

Thanks, one of the best videos I have seen.. I agree you have managed to explain amazingly. so clear and precise... thanks again..

[@jaymechanic1228]

Fantastic channel and video! New to can bus testing your videos are giving me alot of knowledge and confidence to have a go in a methodical way .

[@gr1mr33p3r]

Thanks these practical steps are helping me solve a CAN bus issue on my car.

[@juanjoselaugierastudillo8880]

Muy bueno no se inglés pero brother lo entendí muy bien sigue así , saludos desde Madrid- España.

[@MRDIAGNOSTECH]

Excellente, gracias.

[@1960livvy]

Very well explained and has now given me the tools / knowledge to investigate my jaguar XK8 Many Thanks

[@33798]

Am thankful, Keep up your teaching man 💪

[@telbo5498]

Perfect and simple explanation. Excellent. Thank you.

[@skandix]

Thank You, great explanation and Diagnosis.

[@davidrte.664]

Very good explanation easy to follow and clear and understandable great job

[@mohammadinam7066]

Excellent video tutorial automobile fieder in my life first time I see like this explanation very very nice I don't word to tell about this tutorial

[@sarumiabdulsomod173]

This is a very wonderful enlightening video so far Thanks so much for the information

[@Tripleedge503]

What a great video keep it up! I learned a lot from this video!!

[@geraldsamms9694]

Thx you very much this is a education video I learn a lot

[@frederickbarayuga8824]

Thank you sir. Very well done. Hope to see more of your tutorial about can bus network and some electrical stuff 👍👏

[@ryanhosein7640]

Very very good video. Have been looking for this a while now. Great work.

[@MRDIAGNOSTECH]

Glad you liked it!

[@PotentialTechniques]

Thankyou. This is very useful information and you presented it very clearly thankyou. Hugely appreciated. I'm on a tight budget and scanners will not hook up to my 2001 ford explorer. This might help a lot. Thankyou.

[@АлексейКомарницкий-у5р]

It's a good lesson. Thank you for your good job.

[@amorozzo70]

el mejor video bien explicado. best can bus video, i seen other videos but to me this is the best so far, eres chingon

[@ImranKhan-qi7py]

Indian galiyon ka raja kaise bypass hoga employer bye pass karne ka system

[@handos47]

Thank you for the great explanation on how tyo test the can bus. Excellent video.

[@gabrielrodriguez522]

Congratulations it's a very simple way to explain and understand thank you very much.