Hi everybody, I have a Honda civic 2010 coupe is false error link when I setup ODB2 scan then I probed CAN-H and CAN-L look ok but L-line is a straight line 9 volt dc, it has no wave form during ignition is on or engine is running. I am not sure what it should look like before I continue to chase it down to find the problem. Anyone has any suggestion please!!! thank you every much. I don't want to bring it to the shop or dealer because the value of my car might be cheaper than the cost to repair.
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.
This is great feedback, thanks! I do make an effort to keep the videos as short as possible with an emphasis on keeping it simple and to the point. Glad it works for you!
This channel is really great one of my top 5 for sure. I signd up to the website. Scanner danner is also amazing im signed up on his site aswell. South main auto is another great channel, but its a little diffrnt style. Sometimes he might show you tips and tricks for suspension or something. Where this channel seems more dedicated to showing how to diagnostic. Was just tryn to share couple other car channels you might wanna check out
Hi the image you’ve got for your bmw canbus network layout, where did you get that from please? I’m wanting to find one for audi a3 8p sport back 3.2 vr6 2006/7 as I’ve cut some twisted cables and didn’t realise they were for canbus, new to engine swaps so was a stupid mistake, I’ve stripped all the table off and I’ve got traced them back to modules / plugs etc just need to know what goes to what so I can splice them, if you can help I’d really appreciate it Can-bus cut items Ecu body plug ABS module Airbag module Headlight level module 8P0 907 357 F Steering wheel module 8P0 953 549 F Console/dsg shifter Dsg trans plug Rear diff / haldrex plug diff side CANBUS gateway module plug 10 pin 1K0 907 530G Top side plug tab 6 from left red / brown 6 from left red / black Find what grey / yellow wire goes to on instrument cluster, as that has a cut canbus wire 10 sets cut in total
My 2008 328i runs and drives fines. But I can't get any scanner to communicate to the dme via the obd port. I see the dme runs up pass the ibs to the obd port. And notice both the obd and ibs is the same Grey color in the model you showed. Would a bad ibs interfare with the scanner trying to talk to the dme from the obd port?
@@MechanicMindset Wow thanks for the crazy fast reply. I have just the most basic obd scanner. I can confirm it worked on the car prior to this problem. And can confirm the scanner works on other cars. When I plug it into the e90 is says "no obd ll response" so I can't access anything through the scanner. Thats Lead me to checking all the fuses which were good. Then checking the compartment in the engine bay where the dme is housed. No signs of water damaged check the connectors and everything looked good. Disconnected the connectors going into the jbe junction box one by one. Same no luck. Disconnected abs module same thing. Should I just continue trying to unplug modules to see if thats what's holding up the com line?
@@Winstonzm So there are just 2 wires to the gateway (JBE I think) for diagnostics. Pin 6 & 14 on obd socket. Some people mess with these wires to prevent theft so I would start checking everything is ok at the obd. If it starts and runs, the whole CAN network is probably ok.
How do you know what the abbreviations in the schematic mean? The initials in the boxes don't even make any sense. For instance, how does "Kombi' translate into 'instrument cluster'?
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?
Hi Dominic, thanks for the feedback and glad you are enjoying the channel! That’s quite specific 😅. I think it is best to start with the wiring diagram. That’s what I would have to do to make the video. 👍
I like this video. good explication of diagnistic. But one question i have. When i disconnect one module for to see the error is still there or not, i have to disconnect the battery first or turn off the ignition? or can i disconnect this during date transfer at the bus? Thank you
Ideally, turn off the ignition first. I disconnect modules with the ignition on sometimes for training and haven’t damaged anything yet; but best turn ign off 👍
I have been following topology of CAN . It is similar to the schematic used in video. There are seprate branch for powertrain, crash, comfort etc. Now what i find that each of this branch has sperate terminating resistor. I found that 1 resistor(120ohm)is always in gateway & other is in other control unit ( it could be any control unit in branch) . Is it possible that all branches using 1 common resistor in gateway. Or i am in wrong track ? Thankyou
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.
Please translatet شكرا جزيلا فيديوهاتك التعليمية، لغتي الانجليزية ضعيفة جدا ومن ذلك افهم بحدود 70-80٪ من الكلام رائع جدا جدا جدا حبذا لو يكون هناك قناة ولو مدفوعة بشكل مقبول لتعليم Canbus للاجانب مراعيا صعوبة اللغة عليهم
This tool is a Ancel FX9000. It’s launch based but older software. ThinkCar make a great tool with topology. Autel Ultra is probably top choice for that type of tool
Hello! I have a really tricky one.. I currently repaired the FRM and it fixed all the electrical problems but my windows switch is still not working. I can move the mirrors but I can’t operate the windows. It’s saying that I have a Lin Bus communication problem. Would that be a cable? Please please help me
I have a ram 1500 not communicating with tpms module. Checked resistance and have 60 ohms between high to low, 2.6v high to ground 2.4 low to ground, but, I have .54 volts between can high and can low. Can I have a short on one of the two 120 ohm resistors? This vehicles wiring has been tampered with.
8 месяцев назад
I've used the multiecuscan system on our citroen relay to find the engine faults and fixed all the asdociated problems. Now when I rescan there are no engine fault codes but its pulled up a Body U 1602 CAN line error code but theres not engine light come on. Ive tried searching for a fix on this but its proving harder than I thought. I know its a bit cheeky , but would you have any idea where I need to start checking and or looking at. Some people say to ignore it if theres no engine light coming on .
could anyone tellme what is the basic model of autel or launch i can check the k bus and its modules (communication). should i get bi direct. or any basic model will do mine is e46 convertible. after rain it has some issues,
Hello! I have CAN Bus communication error on my abs which is causing service power steering to pop up when I’m driving for a while. Abs , brake, and tc lights come on and goes away after about 5-10 minutes of the car being off. Any suggestions?? 2015 Camaro SS 🫣
Oh dear! I would try and confirm what type of fault you have (short or open etc) and then try and replicate it. Then you need to isolate the problem (ie is it module or is it wiring) wishing you all the best!
There needs to be a better development in tools or scanners . This reminds me of the old computers it needs to be simpler and more precise its 2024 not 1940
Hey really good video thanks for sharing , but In a case where I would have to start disconnecting modules , instead … would removing the fuse for that particular module be better ?
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
Great to hear you are enjoying the learning. If you want to take the learning to the next level, you should definitely check out the Membership on MechanicMindset.com there is a free access to so you can try it out 👍
Hi, does all CAN BUS communication go through the main engine ECU, or a central ECU ? Or, can susbsytems communicate among themselves without the main ECU being involved ? Thanks,.
Great question! CAN is considered a multi master network; each module communicates when it wants. There is an arbitration strategy to sort priority when there is a clash. There is also a gateway but this just connects the different networks, like a translator. The gateway can be combined in another module or be separate
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.
How did you come to the conclusion that CAN network is OK on that car, at 9 min 35 sec of the video? You just, kinda, said it, but did not explain HOW you had arrived there? What was your thought process? Perhaps, I missed something?.. Please, elaborate.
Hi, I have 2008 e60 535i with the jb4. Do you know if it causes no communication issues with the dme? When bmw dealership tried to connect their scanner they said they can not communicate with any modules. I even brought it to a local garage which they showed me that ista+ with Dan was not able to communicate with any as well. If the jb4 is interfering with the communication to the me how can new modules, battery or keys be programmed? Your assistant will be greatly appreciated.
Dealer said no comm with the dme the dealer should have charged you for diagnostics time and gave you a written receipt explaining why and how much to get comms back to continue further diag work.🇺🇸
Your videos are really educative & on point. Thank you for your time & efforts. Please explain, that i am trying to connect to CAN bus via OBD to a JDM toyota navigation. Are the OBD & junction connector CAN are same or different.
Hi, the link is just below the first paragraph in the description. Tap your email in and you’ll get the link. Thanks for the feedback! Great to have you on the channel!
you have a title but no structure to your 5 tips after that. you have all that knowledge and dont know how to present it coherently. there are no words to indicate this is the first tip or even this is my strategy. take some time to research how to present information.
Just one mention. Week ago had a Porsche Macan in my shop, it throw communication codes all over modules. Couldn't communicate with pasm module. I disconnected it, thinking it was disturbing the can network, but nothing changed couse it was steering rack electronics making problems and blocking pasm module communcation. Strangly I COULD communicate with the steering rack :)
@@MechanicMindset haven't had a topology or that info, all I know that it was two can wires with another 12v wire on steering electronics. When unppluged everything goes back normal, plugged- no pasm module in the list on autel, no communication with it, but steering electronics I could communicate and read codes etc. 😂
I've been having problems with my medium can bus on my 2013 jaguar xj the whole infotainment system is not working I am a mechanic but im clueless to this would you possibly walk me through diagnosing a module my multimeter is quite complex
Your videos are amazing! Very clearly explained. I do have a curiosity though: what could happen if the 12V radio supply wire touches the CAN-low wire? (the wires are located right next to each other in the quad-lock connector). I've done this on my bmw E60, by mistake, while installing a bluetooth module, and i'm not sure if something gone wrong with the can network/modules. Also, how can i test if everything is alright? I've noticed that everytime i'm turning on the ignition, it activates the fuel pump for 20 seconds...it wasn't doing that before touching these wires together. Many thanks!
Glad you enjoy the videos! The network in the radio shouldn’t have any effect on the fuel pump; different network. The 12v short on CAN will not have damaged anything. I do it all the time in training. I’m fact, if it is low speed CAN, that network will still operate as normal! As long as you can communicate with things, network is ok. Re the fuel pump, I can’t remember the pump running for 20 seconds, but if you have a power train network problem, I think the pump will run continuously
Hello sir, I am in Cambodia, my bmw x5 2007 has no sound. radio, ccc is working normal, but no radio sound nor warning tone. Could you please advise from which point I should make the troubleshot. Thank you!
Thank you for your work. Can you please tell us where to find more info about network topology for BMWs, wiring diagrams? Basic can bus network topology is available but termination resistors placement I knew from your video. Where we can get more specific info. Whatever I found was more confusing than explaining. Thank you.
I can clearly see that this is a great video, but is there a video that answers the question "What is a can bus and why is it needed". My old lotus has indicators and no can bus in sight.
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.
Haha, send them my way for some learning 😁 Ah ok yes, got you. I associate the trend of slow CAN not using the 120 terminal resistors (being able to run single wire mode). I’m familiar with the a high and medium speeds that do use them. That’s how we’ve been led to teach it with the manufacturer. Think the important lesson; if you have terminating resistors, there are more opportunities for problems 👍 cheers
Imagine the penquin in Batman. Exact same build. A customer I had was a spitting image. So annoying too with his gauky little voice. He believed I was wasting time testing things on his 735 li bmw and thought by plugging in my scan tool it would find the fault immediately. He’d also said water never ruins engine computers or modules and a heavily blocked dpf was ok plus a big oil leak back of engine no issue either. Ha ha
Brother im an Student from Germany, i swear i learn about Can-bus since 5 Year and ABSOLUTLY EVERY TEACHER thinks we are high inteligent beings, the way they try to explain But you did it for monkeys like us the right way
@@MechanicMindset oh lol I'm dumb. But so are they! Thank you for the reply. I'm literally going through my factory training classes on Networks as I type this!
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!
REALLY - Does EVERYTHING on modern vehicles need to be computer controlled 🤔😒 ?. In my opinion, it is Rediculous that wiper blades and all the other issue displayed in this video can be tied to / caused by problems from the ABS - You are VERY KNOWLEDGEABLE - on locating CAN bus faults , thank you for sharing your knowledge - GREAT VIDEO , and your instruction to ALWAYS start with powers and grounds when encountering a CAN bus fault - is 👍👍✌️🙂
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.)
I love electronics! Problem: Car does not turn on due to communication issue (ACC not being engaged) Car: 2007 Mini Cooper S (r56) What I know: Terminal 15 is not communicating with the CAS which is then not engaging ACC (I think its the K BUS) I know Its a communication error I just cant figure out where/what CAN All lights work (everything works that does not require the FOB (again... Issue with ACC not being engaged)) CAS, DME, Key have bean replaced by me, also reprogrammed (not by me, that would not turn out well) Just a 16 year old trying to figure this damn thing out :) Please let me know if you have some sort of experience with this Thanks!
I have almost identical problem with Vectra C 2.0 2002 (ABS and some other lights on but ABS is still working, can't use turn signals, horn and full beam headlights) but after 20 to 40 minutes of driving (when something worms up or dries) everything starts working well. When I start the engine then RPM and speed indicators drop to zero for a moment exactly every 45 seconds and when that happens 4 times then the RPM and speed indicators stay at zero and the warning lights turn on. After turning the engine off and back on everything repeats again and for the next 4 x 45 seconds everything works well. I removed the CIM and cleaned all the connectors but still the same. When the warning lights are on the error reported by OPCOM is "No communication with CIM". I removed and cleaned UEC, all fuses and some other connectors and added another battery negative to chassis wire but still couldn't find what is causing the problem. The same problem on many Vectra B 1.6i cars could be solved by just removing the cabin light bulb.
Awesome video. Probably one of the most technical and informative channels on RU-vid! Thank you for the information. If I may ask what was your technical background? Dealership technician, college/tech school instructor?
Glad you enjoyed the video. I’ve been through the mill 😂 BMW Apprenticeship > Senior Tech > Workshop Control > Audi Tech Trainer > Global Train the Trainer > Course Author > Managing a team of authors > Mechanic Mindset 💪
@@MechanicMindset Hi, Not really ideal! As the French distributor for PicoScope, I'm trying to organise something similar, since there is a big demand for just this type of video here in France. Although I speak French, and can translate into French, French is not my mother tongue. I think it is important that the voice is French. I'm not keen on subtitles for this type of video.
@@davidpaterson6318 OK thanks for the feedback. No plans in the near future as voice over translation can be tricky to get right. I would also have to set up a separate channel (which isn’t impossible, but maybe in the future).
Thanks, Great video. After you have lokking at the wave forms of the can-bus, you was knowing that the canbus system was OK? Than you know that the problem would be the abs-module itself, the power/ground to the abs-module, or the can-connection(cables or connectors) to the abs-module?
Love your videos man! Quick question- @around 14 mins you use the scope to check can- you refer to low speed can and high speed can but the scope shows the blue and the red reflecting each other on both, I’m assuming you’re just checking between obd 6 and 14 on both? Or are you doing 6 and a body ground for low and then 14 and body ground for high? I’m new to scopes. Thanks!
Hi Mechanic Mindset, Great videos, I'm trying to diagnose a lost communication problem over CAN Bus in a Chrysler product and you've helped me understand a lot better how CAN bus networks works. I tested the network today with an oscilloscope and I wasn't able to se any interference in the messages. I was worried about some big spike at the end of messages (up to 5V in can high and down to 0 in can low) But seeing this video I see that you have similar spikes in voltage. Is that normal? since you don't seem to mind them I'm guessing theses are normal? Also the network doesn't have a terminal resistance of 60 Ohm like its supposed to, I get 40.7 Ohm instead. I'm currently trying to isolate the module that does that but I didn't have any luck with the oscilloscope, everything looks normal. My problem is also intermittent, the Jeep can drive fine for hours until every module freaks up in the dash. Thanks!
Hi, yes the spike at the start of the message is normal. I’ve not come across 40ohms before, but look in the common modules that all models have (ie engine, ABS) The scope will be a good tool to capture the intermittent fault. Just test in a long time base and zoom after the fault happens to see what it is 👍
Thanks for your awnser. I just found that an aftermarket device that I installed in the Jeep to bypass a security module in 2018+ Fiat/Chrysler products to be able to plug diagnostic tool made it drop to 40.7 Ohm. When I remove the security bypass the network goes back to 59.6 Ohm. This device was installed after my CANBus problem started (trying to diagnose it), At least I can rule this out of my symptoms.. Next step is most likely to go drive it with the oscilloscope and try to catch it when it happens!
@@JeanFrancisD Likely the bypass had its own internal terminating resistor thus dropping the CAN resistance to your observed 40 ohms. Not really a problem, but it can happen even in certain OEM applications where the manufacturer installs 2 terminators and uses another component that has an internal terminator as well.
Great video. I had a very similar fault on a Mini Cooper S. ABS module DTCs, Christmas tree lights on, wipers going etc. Even the sun roof wouldn’t work. From memory I think we also had ‘voltage low’ errors. Turned out to be a faulty fuse box module. Had to replace and program the new module to fix the problem. We changed the ABS module a couple of times first but that was a red herring.
@@MechanicMindset I had a related question if that’s ok. I don’t think I’ve ever seen anyone on RU-vid attempt to communicate with a single module in isolation to the rest of the network, e.g. testing communication of say an ABS module on the bench by giving it power, ground and scoping the CAN pins. Is that possible to do?
