Chrysler is good for mounting critical components in the worst areas, like PCM's in wheel wells ect. and wonder why they have problems. Great find. Thanks for sharing.
As fellow mechanic but I am heavy and construction. For my knowledge of automotive, you seem very humble and proficient at checking everything. Most mechanics bad mechanics order parts as soon as the isolated the issue. A 2 dollar fix or less all day!
Seriously bro! I think you're a genius! I mean it from the bottom of my heart thank you so much for your videos! I worked on cars before computers and I am learning new things everyday!! THANK YOU FOR HELPING AN OLD DOG LEARN NEW TRICKS! GOD BLESS YOUR SHOP AND FAMILY BRO!! ♧♧
CANbus is essentially a balanced signal line, and the zero volt point is virtual ground, so that mirroring explanation is perfect, when either side does something non symmetrical it indicates an imbalance, it's not the only way CANbus can fail, but it's still a great troubleshooting technique. One of the reasons CANbus was adopted for vehicle data communication is because of the immunity to interference with cheap un screened signal lines, only possible because of the balanced system they use. Any interference or noise with reference to ground is effectively self cancelling. Thanks again for another great video.
This is exactly the same principle as that used with networking computers using ethernet cable. In computing it's referred to as UTP - unshielded twisted pair 😊
Great video, not too many videos show the whole process from diagnosis to fix. I've got some sort of CAN errors and voltage comparison failure I'm trying to figure out and really appreciate this.
Somehow, finally, I seem to be getting to a first base of understanding how these systems work. Thanks for starting at the beginning, advanced channels assume viewers already have fundamentals. I am particularly impressed you were able to find a bad wire! Lesser men would have replaced the end device, and then hunted further when the problem continued. With a bad connection, you might not see a problem until the vehicle was moving on a bumpy road.
I watch this video and unfortunately I didn't get the information that I need to fix my truck but on the plus side another vehicle I am having issues with I was able to address the situation with this video so long story short I didn't find what I was looking for but you helped with a different problem thank you for that
Thanks, Very nice and informative video. This is also a well built car. That splice is very handy. I'm facing a similar problem on an AUDI. CAN wires there are all twisted together like my grandfather electrician was used to do. impossible to disconnect without scissors... what a pain. :)
Great video. My only suggestion is use the ground lead off your power probe and when you can keep the vantage pro but pick up a vantage ultra. Watching Can bus on a vantage ultra is great alot of detail. For fun I use my vantage ultra with my break box on my 2017 and drive around and watch data.
When the bias voltage raises as shown in the glitch, you would want to verify the grounds of the module that's causing the failure. Nice video. A lower time base for detail can also be necessary in some diagnostics
Hi, thanks for this bro. Just had this happen to me a year ago when I replaced my ATF on Subaru legacy Er HC on the dash and the dreaded Christmas tree, just left it overnight with battery removed and it hasn't acted up since. Just bought a scantool(the Ancel X6 and saw the diagnosis codes B0202 CAN-HS bus off, B0221, CAN-HS ECM no-receive data, B0222 CAN-HS TCM no-receive data) and researched them, I was wondering what caused it for a year, just arrived at the answer thanks to your video by putting 2&2 together. Keep it up bro.
Thanks!! I appreciate you helping us figure out CAN stuff. As a home mechanic, this is that VooDoo secret the dealers kept to themselves. Oh no, you can't figure this out. Only we with the knowledge can fix it. Anyone have a recomendation for an inexpensive scope for us Shade tree guys?
Pico scope has a 1 channel hand held scope for about three hundred + or try to look for a used vantage pro from snap on , those are really good beginner tool , it's got presets setting.
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excellent video short concise and organized. easy to follow what you did and you didnt overload the audience with gobs of informantion not pertinent to this issue. spot on insertion of the pinout of the dlc and what you were going to measure. no wasted extraneous inof about the dlc. typos oh well
Nice job. Good find. One thing tho. Back probe pins are called that for a reason. They go in the rear of connector's. The next time someone scans that vehicle they may have proplems.
For that system they have an OBD2 pass thru socket box with the identifications so you use banana plugs to access signal. But in defense of his pin tap in front those pins are so thin they usually fall out.
@@carmo9693No, thin maybe, did not see them fall out. Those pins are round in a rectangular terminal. Maybe not today but if everyone used this practice we will start to see obd connection issues that will prolong the diag for the main issue at hand.
You do a great job explaining all this, broke it down to laymen's terms easily understood. You have a new subscriber, i could learn from this channel. BTW, could a oscilloscope be used to test the can bus?... and does OBD2 port use those same two pins on all cars for testing the can bus?... I do assume it would.
Yes the Automotive Oscilloscope is used on all OBD 2 Cars and Trucks. Pins 6 and 14 are Can High and Can Low. If Eric used a Break out Box, testing the CAN Network would be much easier for him.
Good video, but for people that are interested in performing this kind of work, you shouldn't stick backprobe pins directly into the dlc. You could potentially cause damage. It's much better to use an obd 2 breakout box to perform this kind of diagnosis. It's a safer way to do it, as far as preventing damage to the dlc, and will also provide a better connection than backprobe pins will.
Great video really like the information but you can change the time base and you can change the trigger put it on single sweep and it might capture the glitch easier
I have a NO BUS message on my 2016 Dodge charger pursuit will this procedure work to diagnose my problem as well or is it something totally different? traction control, ABS light triggered.. please help if you can
When disconnecting lines at the splice and checking for glitches, do you reconnect the connectors or keep them disconnected and just continue down the line?? Thanks, and great video as always.
My 07 jeep commander has set a "lost signal" code for every module the bcm controls. I havent started diagnosing it yet, but, i think the place to star is checking grounds and the harness. Ive seen wire looms resting against coolant hoses and what not.
Thanks man this video is awsome i learn alot, i was following diagrams on shop key, to understand a little more. Ur awsome do you a book to know more about car electronics?
very good video. thank you. i have a question-when you pull the single wire connector off the splice pack-is it can hi or can lo? i know that they rely on twisted pairs. i am just getting into can communication diagnoses and am still a bit confused.
Heads up on 2018 and newer you cannot check CAN at the dlc. Fca vehicles have gateway module now. Need to check CAN at the star connectors or a splice. Those are star connectors not splices btw
I have a 2007 Ford F150 5.4l 4x4. I checked the can bus high and got 2.4 volts. I checked can low and also got 2.4 volts. When I checked resistance between pins 6 and 14 I got 0 ohms! Where do I go from here?
