Working back late. It looks cold and you still find time to share logical diagnostic procedures to help people improve themselves. You are definitely one special fella Jake. A credit to the trade. Thanks from over the pond. X.
Aargh intermittent connections that fix themselves are the worst! My strategy is to bisect the bad circuit in the middle if possible, like connector X115 on the diagram. Then you rule out as many other connections as possible without disturbing them. If the circuit is suddenly "fixed" then you know that the problem has to has to be close to where you just touched it 😉
Gotta love those intermittent electrical issues. I spent two weeks last fall chasing one on a Webasto boiler system. Sometimes just opening the compartment door on the RV fixed it for the day. It finally came down to a broken solder joint in the controller. The one good thing was it seemed to get worse with the temperature dropping outside.
GM denotes all the trucks by the fifth place in the VIN number. C is 2WD and K is 4WD. I like the simplification with the DVOM to test and follow the direction of the fault using OHM's. Nice work as usual. See you in part 2! Part 2 should be a bulb test to load the circuit between the modules. Low tech style
Jake. These videos are so good. I used to know nothing about can networks. Then I came across your channel. I’ve probably watched all but maybe 5 videos. I have learned so much. Please keep making these. I can’t get enough.
Good job 👍🏻 And a great thought process. Although there's a part 2 and i haven't seen whether you've actually done this or not, but I'm gonna say it anyways 🙃 it'll be more efficient to look at you multimeter reading while wiggling the wires to see if the reading fluctuates or changes to being open circuit again. Thanks for sharing 👍🏻
Well Jake you picked a good one this time. Can you just disconnect the harness at the fuse box and check continuity from the pin under the hood to the pin in the cab to see if it’s definitely in the harness. Just a quick guess my brain is pretty scrambled right now taking care of the wifes cancer issues. I’m probably way off if so just chalk it up thanks for sharing. 👍 Artie
Well... a bunch of other channels would have stopped right there and said it's been to 5 dealers and they wanted to sell an engine for the commx issue. We fixed it and it's good now😅
I have a Launch Pad 5 with the "smart link" dongle. I love the tool. I did buy it on amazon for cheaper than you can get it from a "dealer " for. At the time I did not know that its a "global" version tool not a USA based tool. With that price difference your paying for the customer support based in USA instead of globally. So far it hasnt been an issue. My previous tool was a launch diagun. I always said I would get an autel so I had a different brand tool. Im really glad that I went with the one I went with. I have used the "smart link" with USB on GM SPS and it worked great.
Nice can’t wait for part two got to say been awhile since an ohm meter was my go to a problem Is there a procedure after you make repairs to restore RAM ?
oh yeh . has a few of those in my time . even when your being mega careful you can just nudge that loom and bang it clears . then it’s the pain staking task of trying to replicate the issue because you can clean them all but i like to figure out were the problem was . you just know if you don’t it will haunt you for days 🤣🤣🤣🤣
If I was gonna bet a dollar on this, I would bet .50 on that tranny connection and .50 on an as of yet to be located ground connection. I would also check to see if those interior lights are cheap aftermarket led bulbs. Great video when even I can learn something! ✌
GREAT VIDEO ,,, I HAVE A NISSAN FRONTIER THAT'S BLOWING A TRANSMISSION MODULE FUSE THAT IT DOESN'T HAVE . CONSIDERING THAT IT'S A MANUAL GEARRBOX BUT IT HAS A TCM MODULE FUSE AND IT BLOWS AS SOON AS YOU CRANK THE TRUCK . WIRE DIAGRAM IS SUPER PIANFULL TO USE SO NOT SURE WHERE AM GOING WITH THIS ONE BUT THANKS AGAIN FOR THE VIDEO !!!!
Jake, around the 8:00 minute mark you said that you had terminated leads hooked to the DLC. Are you saying that these two leads each had 60 ohm resistors integrated into them? Thank you.
What worries me when back probing is "pushing the pins into making a batter connection" and not realizing I may of fixed the issue, then have me scratching my head. Now on random thought, I hope some day Autel will sponsor u a MS-909, 919 or Ultra so u can throwaway that blue box 😂
These have problems with resistance at the battery cables. Test for voltage drop across the battery cables….Causes these exact same issues. There is a TSB for it…
2018 would have the upgraded cable by now. When this body was new in 14 and 15 the cable mounted to the bell housing end and they changed it to a shorter cable that bolts in front of the starter. I don’t think I’ve seen one of the new designs have the issue yet.
Man I just fought a 02 6.6 with a class 2 fault. Everything tested perfectly by meter and scope. But when I would try to communicate with the tcm ( allison) I'd get a no com. I chased it for 10hrs at least. Was chasing the k-line which was for the g.c and t.c.m only . G.c was online t.c.m was not ... no splices directe connection from the data comb . Never did find where the problem was but finally ran a jumper from the d.c to the tcm and all is good .... scary though I've got to start on a 2012 today that's throwing codes for all the engine sensors and dies . But only happens when the owner is driving alone ????? I cant recreate the problem, not even with him driving and me miss dazying.
What is your advice to someone who has completed the electrical basics, electrical circuit malfunctions, and inspection methods with a multimeter and telescope, but in modern cars I see that I am incapable of diagnosing health conditions. I do not understand the rules. Your advice?
@@autodiagyt Yes, if the systems are understood, diagnosis can be made. I now lack understanding in modern vehicles, the connection of computers and their communication with each other. Can you recommend a book or someone who explains that?
@@autodiagyt More extensions than when you checked the junction block? That could explain it. But if it was the same, I'd think that would be an indication of where to start.
My check from the dlc to the ECM told me I had an issue on 1 wire only. The goal was to trace its connections from the dlc to the ECM until I found the high resistance. On X61a I did check X4 pin 5 but X2 pin 7 was on the backside of the box and you have to unbolt it and flip it around to check it. I felt like that would be to much movement and might disturb the bad connections.
@@autodiagyt That's what I thought. I just got back from one of the gm training centers last week and they were saying they're having problems bugging cars on vip vehicles because the topology allows modules more than one path of communication. After a key cycle everything goes back to normal. Skynet stuff lol
