Accomplished New level Auto Video great tutorial👌Thank you very much take care and have a great Evening Accomplished New level Auto From Nick Ayivor from London England UK 🇬🇧
I mainly do big trucks and industrial engines . These simple. Videos have provided a foundation for me that goes beyond the trouble tree schematics that take you no were techs in the big stuff struggle with J1939 issues because they dont understand the basics steps of diagnosing that 2.5 volt and scoping the signal they just want to ohm the pins and move on Point being thank you for your very amazing videos
That is an awesome compliment! I really am happy that I can help ! And keep going out there and show the others up. All they can do is follow your lead
You're an automotive wizard! You've proven yet again that that a scope is a necessity in this field. Nice work, I always learn something from your videos.
Keith, seriously. I'm mind blown how you diagnose that quickly lol. I tried to follow how your thought processes go. I'm not a wizard not even close at all. But this is great lesson for me to learn something so cool how to do. Great class :) you da man! Many many thumbs up
What causes the elevated voltage? I'd imagine it has to be a bad, or lack of a ground internal to the ABS unit? Amazing how one unit can bring down the whole works, and leave you walking!! Welcome to the 21st Century ... 😂 You and the family have a very Merry Christmas, and a Happy, Prosperous New Year. God bless you, brother. Thanks for all you do!
Smart thinking on the ground. That's was the only 2 wires I had left to verify. After testing them it was found that indeed the problem must be internal . Merry Christmas to you and your family as well
I have an 06 Frontier V6. I'm keeping this video for reference. Mine has ABS, but no Traction Control. It does have 4WD with a 6 Speed Man Trans and a 4.0 L engine. Cold EZE works for me. Merry Christmas
First Bam! Ok ok I’m not first. This was a walk in the park for the magical mystifying Keith D 😂😂 excellent video my friend. Merry Xmas to you and yours and the rest of the RU-vid family.
In the IT network world this type of behavior would be considered a denial of service attack when bad packets flood the network and no one else can talk. I can just see a firewall/gateway on the CAN bus in the future where all modules go through the gateway and the gateway stops the packets from a bad module as well as identifies and turns off that module. I think some systems like on Hondas they do isolate certain modules and the DLC behind a gateway but more for prioritization so lower level functions don't interfere with the more critical module functions.
Great video Keith...I tried pausing the video to pull up the Computer Data network diagram to see where you were going with it and I found where all the K-lines come to a splice point in which they all converge. What I'm wondering is why the SRS and ABS were the only two not communicating to the DLC? Since your DLC connection point is at that splice point as well? It seems odd that those two failed to talk; yet all others were still able to push messages through it? Is this due to them having HS CAN lines? Weird how that happens, but in either case, I kind of figured some type of unplug it test was coming up. Great time following along as always. Get some rest man!
What's the likelihood of a short to ground on one of those wires? What's your approach for shorts, do you do it like the manual says, disconnect plug, check for continuity & resistance? Thanks in advance.
Does it ever turn out to be a bad sensor input to the module, rather than a primary module problem? I'm wondering if you need to go through the effort of disconnecting the wheel sensor input signals to see if the problem persists....
That's an awesome question! The answer is yes depending upon the type of sensor they use ! An active wheel speed sensor that uses a 12v supply is indeed possible. HOWEVER, what I have found up to this point is that when the voltage is interrupted on most of them , the abs module will in turn remove the 12v altogether until key is cycled
The ABS Module is just speaking in tongues. I heard that's common on the Island after a night of heavy drinking. Jus' let him sleep it off. He'll be fine after some comfort food and a coffee.
Of course ! I have one now that I'm working on that has been a mind baffle for many before reaching me . So far all of their testing was spot on and the vehicle is indeed still broken. I've got about 2 visits at 2 hours a piece into it and more to go for sure .
Pretty much every manufacturer out there. There are different strategies that can be used at times where the signal will be manipulated by a gateway module. But they are so few that chances of seeing one here is very slim
I’m curios,why do you think it’s almost always the ABS module that messes up the signal on the communication lines? I’ve never ran into it myself but I’ve seen at least 4-5 videos and it was always the ABS module.
The Godfather is back Keith “EasyPeasy” Defazio. Can this be caused by an input/output to/from the ABS being bad, causing the module to not communicate 🤔
@@kirkabrahamson1148 there you go fellas , if the module has a poor ground supply, then there will be a inability to pull that signal low as designed 👍👍
We shouldn't have a sine wave . We should have a square wave , actually a series of square waves forming data packets. Yes the abs module was bad and yes it was replaced this morning and vehicle is back on the road once again. Thanks for watching
Seems like ABS modules contribute to a significant number of CAN bus failures? (perhaps because they are continually exposed to engine bay conditions) Considering how easy the ABS module is to disconnect (usually) it might save some time to unplug them briefly every time a bus problem seems apparent. Also interesting that, in many cases, the failure seems to be front end and exert a positive DC bias to the signals. Hope one day I can't tear one down & find out what is being hosed on these, when I find one. Have you noticed that while ECMs are designed to closely monitor the voltage, current and, sometimes, the load resistance on the various I/O lines, they don't do a great job analyzing the CAN bus lines themselves? A pity as it means any module on the HS bus could leave you walking..
I think that in the very near future we will be seeing more of the Smart Can bus systems . Be sure to check out Chris' video here ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oj5IWlRbRL0.html
Too much voltage equals short to ground in the can bus trick to diagnosis is the biased voltage reading in this case 6 volts too high short to ground it's not magic although Keith is a diagnosis wizard lol
