Programming J1850 modules on GMs older than late model

Timothy Owner/Technician Wisconsin Posted   Latest  

Anyone got a work around for these old GM vehicles, where SPS2 is killing them? Other than waiting for hours/days on end for GM Tech help to remote in and program them? Last one, I gave up after two DOA modules, and sent them to the dealer, after being on hold for over two hours, and then no callback ever. Took the dealer a day and a half to get it done, as they're having the same issue…I don't get paid for hold times though.

Aside form having to have the old Tis2000 discs/keys laying around?

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Andrew Mechanic
Michigan
Andrew
 

All Credit to Keith Perkins. This is word for word a quote from him. Link at the bottom. Have you ever attempted a programming event on an early 2000’s GM truck or van with a J2534 device? If so chances are you have had a failure or two. This is not uncommon, and it can be a stressful experience, but it’s not the end of the world. The early GM class 2 network (SAE J1850 VPW) that I am speaking…

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Timothy Owner/Technician
Wisconsin
Timothy
 

Unfortunately, some of the information is not correct. J1850 was basically Class2 serial data, and was used across most of the GM line until CAN was phased in, as well as LSLAN on those. I've never had an issue using the MDI (factory, no clone) 1 to program any of the J1850 modules. I only use factory tooling for flashing. That way, when you call for Help, they actually will do something, rather…

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Kerry Mobile Technician
Ohio
Kerry
 

Tim I'm not sure that everyone is on the same page. What is trying to be said is that when the module bricks after going a quarter of the way as you say,( if it's not due to low power) it's usually due to unauthorized traffic on the class two or j1850 data bus. I guess it mimics data communication diagnostics as you say,to go into the splice pack, but that's not the reason for doing it. It's to…

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Timothy Owner/Technician
Wisconsin
Timothy
 

All that is wonderful, but not what the issue is here…I have NEVER, repeat NEVER have had to remove all the modules from the Class 2 lines on a TrailBlazer to program them, have done literally well over a hundred through the years. Only requirement is to remove the liftgate module fuse and the brake fuse to take those off the bus. That is not true of all trucks, as there were a few (known…

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Kerry Mobile Technician
Ohio
Kerry
 

Timothy, I feel your pain. I'm not sure how to process all the data that we have on the table right now though. Before pulling my teeth 2000 laptops back out 2 weeks ago I was able to do a 95 Camaro with pass through and the tech2 successfully so you're going to have a hard time convincing me that it's "broken broken" & doesn't work. I think the new system is just super sensitive and not…

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Mike Mobile Technician
South Carolina
Mike
   

Tim, If the programming even begins, and then fails partway through it is most likely another module sending out a message on the bus causing the failure. I've seen it enough that I always pull the splice packs on those. The first one I had didn't brick the module but beep booped consistently at about the same percentage, but not the with the same bytes transferred. It went through the three…

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Timothy Owner/Technician
Wisconsin
Timothy
 

Would that ten minutes would suffice. Have you ever tried to isolate a mid 2000s K truck splice pack? Totally buried in the dash, and that is the truck lines that always have issues with flashing if the ABS is left on-line…now you're looking at another half hour, at least, (provided they don't have all kinds of other s@#t buried under there…ROI falling by the minute…

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Mike Mobile Technician
South Carolina
Mike
   

I don't recall ever wasting more than 10 maybe 15 minutes accessing a splice pack. I agree though you should not do it. It logically makes more sense to spend that time bricking the module and then having to explain to the client why it isn't your fault. Bonus you'll also save the 12 minutes on the VTD learn. And probably a lot more time when someone else swoops in and earn that client. The…

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Rusty Owner/Technician
Massachusetts
Rusty
 

Great thoughts. Can I ask why accessing the comb will save me time on a VTD learn?

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Mike Mobile Technician
South Carolina
Mike
 

The idea being if the programming fails you will not have to run the VTD learn.

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Timothy Owner/Technician
Wisconsin
Timothy
 

Well, I have never accessed a splice pack except on one particular truck line, and I priced accordingly, just as the dealer would. Never had to do it for any other flash. And, since no-one knew about the issues with J1850 programming with SPS2, (GM did not bother telling anyone until the day after when I got hold of the Help desk), no-one knew that they were bricking. I guess I wasn't the only…

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Jose Technician
Illinois
Jose
 

I made a couple of bench harnesses for PCMs that I have noticed fail to program frequently. For example the H3 hummers pcms always gave me trouble and p01 p59 pcms when they have an aftermarket radio or alarm. However these were issues that were present even with tis2000. Im not sure what new problems Sps2 has introduced. I do keep an install of xp with tis2000 for situations like this.

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Michael Mobile Technician
Utah
Michael
 

If you are just concerned about Engine ECUs then there is TunerCat. It is expensive up front but no tokens required. I bought mine from Moates​.​net It can be used to clone one ECU to another. There are also HPTuners and EFI Live which are token based. It has been reported that EFI Live does not require a token to change VIN. If you can find someone with TIS2000 and a dongle, it is a…

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Rex Technical Support Specialist
Ohio
Rex
 

Michael, reading posts like this make me very thankful that I am in Heavy Duty. I know it is coming but for me personally I think I will be out by 2027 at the latest. It is also a much smaller vehicle and customer population. The American Trucking Association via The Maintenance Council does seem to have a level of input with the OEM's that does not exist on the light duty side. On that I may be…

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Rusty Owner/Technician
Massachusetts
Rusty
 

I appreciate that info. I have a TIS2000 kit with a dongle and an older functional XP laptop. I’ve never used the TIS2000 application as I’ve always used SPS and a Cardaq so I have a question: is the TIS2000 only used with a Tech2 via “remote”? (I do own a Tech2) Thanks,

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Jose Technician
Illinois
Jose
   

You can also use a j2534 device. You just have to go to the I/O management screen In tis2000, Select install driver And install the j2534​.​dll located in c:/Program Files/cosids/bin/ folder. Then add a new device, name it Generic Pass Thru, exactly like that. select j2534 pass thru as the driver and add. Now you can hit configure and select your j2534 device. keep in mind what…

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Roberto Diagnostician
Massachusetts
Roberto
 

So far I've been able to program 2 pre 2003 PCM using SPS2 by removing the rest of the modules off the network. The programming is slower than usual, but maybe it was just luck.

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Timothy Owner/Technician
Wisconsin
Timothy
 

That is always a possibility, but who's paying for the extra work? If you get there, and all of a sudden you're jumping splice packs (lots of them are absolutely no fun to access), then where is your ROI if you raise your price? The shop will most likely be upset with the issue…"You said it was THIS much, how come it's now THIS much"?! Until the bugs are out of this, I'm not promising anything.

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Timothy Owner/Technician
Wisconsin
Timothy Resolution
 

No real resolution to this issue at this point, and we're not getting much input from GM on this. Pretty much a crapshoot, depending on Y/M/M. Have had issues with all low speed modules regardless of the year, but no issues with CAN modules at this point, nor any late model stuff … is all I've had a chance to try). Issues seem to be the same: cannot program low speed older modules…

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