Modifying a bin... checksum?

[caesar]

Say for instance I found some random table and modified it in hex. Wouldn't I have to fix the checksum or do something like that before reuploading? If so, how do I do it?
Thanks.

[Keith@HPTuners]

Yes you would have to recalc a checksum, or disable it. Either of which I do not know how to do on OBD-I vehicles. :-/

[caesar]

Hmm, how about Tunercat's checksum tool. Would that work?

[Keith@HPTuners]

If they support the BIN i believe it would.. but i'm not certain. Best to e-mail them for confirmation.

[caesar]

Yea, bin files is what Tunercat uses. They are probably raw too because for older cars I can read a chip in an EPROM programmer then open in directly in tunercat.

[Keith@HPTuners]

What I mean is if they support the LT1 files.

BIN is just short for binary... pretty similar to RAW. RAW is just a straight dump, BIN is just a straight dump.

[RoboGeek]

yes tunercat can recalc them.
winbin also can and I'm pretty sure most editor ones will work ok.
You can also do it manually if you have ALOT of time! I used to know the formula but my brain has a memory leak..

[Casey]

Say for instance I found some random table and modified it in hex. Wouldn't I have to fix the checksum or do something like that before reuploading? If so, how do I do it?
Thanks.

If you change the ID byte of the BIN (say $EE, $42, $8D etc) to $AA, the checksum error is ignored.

$AA is the engineering ID byte. Good for quick testing, bad idea for everyday use.

[Diesell]

Where abouts can I get this tuner cat software???