Checksum 2000 grand prix gtp

American Delco GM ECUs and PCMs, ALDL, OBD 1.5.
Posts: 44
Joined: Fri Nov 13, 2015 10:52 am

Checksum 2000 grand prix gtp

Postby Tyson » Tue Jun 19, 2018 7:16 am

Hello I've started an XDF for my 2000 GTP wondering if anyone can point me in the direction to figure out the checksum I no were it's located just not sure how to get it so it adds it up when saving I'll post the xdf and file later when I get home to my labtop. Also the tiny tuner does the checksum right and is open source wondering if we can borrow it from there thx Tyson

Site Admin
User avatar
Posts: 5629
Joined: Sat Feb 28, 2009 8:34 pm

Re: Checksum 2000 grand prix gtp

Postby antus » Wed Jun 20, 2018 10:28 am

Sure. There might be more than one sum too. Probably just 16bit sums, starting after the sum and running to the end of the segment. You should be able to use hxd to highlight and calc to test guesses more quickly, or just read the tiny tuner source.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

Posts: 44
Joined: Fri Nov 13, 2015 10:52 am

Re: Checksum 2000 grand prix gtp

Postby Tyson » Tue Jun 26, 2018 12:50 pm

antus wrote:Sure. There might be more than one sum too. Probably just 16bit sums, starting after the sum and running to the end of the segment. You should be able to use hxd to highlight and calc to test guesses more quickly, or just read the tiny tuner source.


Thx antus downloaded the hxd and played with it a bit have to sit and figure it out yet see if I can been trying to figure the checksum or sums out got a bit of an idea but I'm lost lol but ill figure it out trying to open up the source code on tiny tuner but visual studios is freeking out lol so I have to try re download that see if I can go through the source code on Tiny but I figured id put this up here just a start by NO MEANS is this XDF usable but its what I put together in a few hours the other night little messy yet havnt totally figured out tuner pro yet first XDF. Thx again for points and any help Cheers
Attachments
gtp start xdf.xdf
(84.6 KiB) Downloaded 37 times

Posts: 1096
Joined: Sun Mar 15, 2009 10:20 am
Location: Geelong, VIC

Re: Checksum 2000 grand prix gtp

Postby yoda69 » Tue Jun 26, 2018 8:36 pm

Can you post up a copy of the bin file as well?

Posts: 44
Joined: Fri Nov 13, 2015 10:52 am

Re: Checksum 2000 grand prix gtp

Postby Tyson » Wed Jun 27, 2018 2:49 am

Yes here it is sorry ment to attach it as well
Attachments
Stock Cal file I MDI it.bin
(512 KiB) Downloaded 40 times

Posts: 1096
Joined: Sun Mar 15, 2009 10:20 am
Location: Geelong, VIC

Re: Checksum 2000 grand prix gtp

Postby yoda69 » Fri Jun 29, 2018 7:45 pm

I expect will be similar to LS1 as Antus has alluded to and have multiple 16bit sums as there will be one for each segment.
Had a quick look at the bin file and can see that VIN is 17 digit ASCII starting at hex 601A, 1G2WR5219YF282882

Posts: 44
Joined: Fri Nov 13, 2015 10:52 am

Re: Checksum 2000 grand prix gtp

Postby Tyson » Thu Jul 05, 2018 10:50 am

12201788 2000 GTP XDF.xdf
(128.78 KiB) Downloaded 35 times
Ok so doing a bit more work on the XDF and I'm not sure if tuner pro can handle the checksum think a plugin would have to be made like the LS1 XDF I can post the source code for tiny tuner if someone is willing to make a plugin app I would but I havnt A clue as to do it still lots of learning hope someone can help out with it, found it in the source code and it looks like theres 4 steps to the checksum calculation but just what I'm gathering as I said not good at reading or writing code hope someone will help and heres an update for the XDF

Posts: 44
Joined: Fri Nov 13, 2015 10:52 am

Re: Checksum 2000 grand prix gtp

Postby Tyson » Thu Jul 05, 2018 10:56 am

Sorted to parameter categorys
Attachments
20180704_184336.jpg

Posts: 44
Joined: Fri Nov 13, 2015 10:52 am

Re: Checksum 2000 grand prix gtp

Postby Tyson » Thu Jul 05, 2018 10:58 am

Checksum code
Attachments
20180702_173028.jpg

Posts: 44
Joined: Fri Nov 13, 2015 10:52 am

Re: Checksum 2000 grand prix gtp

Postby Tyson » Thu Jul 05, 2018 11:01 am

Checksum steps
Attachments
20180702_173045.jpg

Next

Return to US ALDL ECUs

Who is online

Users browsing this forum: No registered users and 1 guest