Recent content by kastein

Thanks very much for getting so much of this info documented up front. It's definitely helped me get started on my current project. I'm seeing some weird undocumented (at least in the 99 version of the standard... anyone got a later J2178-4 handy?) secondary IDs on more common primary IDs, as...

Now I'm curious, you have a command to turn on the secondary/transfer pump on a dual tank GMT800/600? I'm trying to get my aux pump working at the moment and I'm not sure if I'm going to need to swap my fuel segment in the ECU with hptuners, or if my calibration is just wrong. It's wired to...

I'm actually very curious of this myself. I can answer half of this question about half of the data, but as a result I have a second question. I'm not sure if this was already cleared up sometime in the last four pages, but here we go: This is apparently the magic incantation for reading SAE...

My apologies, I just was working on various other projects and not checking my email or forums. I come bearing news of PID 1338 - at least on a '03 LQ4 ECU from a Savana 3500, it is exactly as expected. I just got around to digging out my spare ECU connectors, stole a few pigtails off them and...

Well, I have good and bad news. Good news is yes I could have, and I actually found some info from when I pulled it at the junkyard. It was an 06 Escalade donor. Bad news is while packing up my hangar into a shipping pod 2 weeks ago I had a guy come by to buy a project vehicle and while he...

Interesting! I was trying to test some of that out myself, but all of my ELM327 devices flipped me the bird simultaneously (except for the one 3 timezones away at the moment...) so I gave up. Good to see that it's the broadcast data I was expecting. I was able to verify that SAE J2178...

I can, but it's currently 3000 miles away (I'm halfway through moving cross country) and it's unlikely I'll be in a position to mess with it till next month. At this point I think I've probably got nothing more useful to add till then, unfortunately. Just found your class 2 serial data...

Alright, now that I've caught up entirely on the thread... I'm 99% sure I know what this is. It's likely an older, rudimentary system similar to the dynamic PID setup you discovered a page or two ago, specifically for handling the trim table. So I suspect you would either use the fuel trim...

First of all, thank you very much for posting this all, this thread has come up many times in my google searching over the last few days, along with a few others including PCMhacking, etc. I don't actually own a GMT, just parts of them (LS swaps...) but got so much good info from this thread I...