Hey guys!

I found this site: Dump the flash from your 32 bit GM PCM.

Here is the main page:

Dump the flash from your 32 bit GM PCM.

This article describes how to make a simple modification to your 68332 based GM computer to allow you to dump and reprogram the flash. It operates using the BDM port that is built into every Motorola 68332 processor. The BDM port is normally used during software development to allow the programmer to single step through the code, set breakpoints, examine memory, etc. The BDM port has complete access to the CPU and everything connected to it. In this case that means it can read the contents of the flash, and also reprogram it.

This method of dumping and reflashing does not use the DLC (OBD2 connector), and does not require any scan tools or other OEM type hardware. The article is divided into 2 parts.

Part 1 describes the modifications to your PCM. 9 wires have to be attached to vias that already exist on the PCB, and a 5x2 male header has to be hot glued to the board.
Part 2 describes a particular set of hardware and software that I used to dump and reflash my computer. Part 2 is optional, once the steps in Part 1 are complete you can choose to use a commercial BDM product. A google search should turn up plenty of these. Or you can build the hardware described in Part 2, and use the software provided. You can even write your own software using the driver and library provided.

Nothing in this article, properly implemented, will affect your PCMs operation. However, modifying the flash can leave your PCM (and vehicle) inoperative, or worse. These changes have not been tested in a vehicle, only on a workbench. Please be careful if you decide to make these changes on a PCM used in a vehicle.

PCM Flash dump, Part 1, Modifying your PCM

PCM Flash dump, Part 2, BDM hardware and software

Would anyone mind downloading and posting the pictures and steps in case this webpage were to disappear?

Hope this helps!

------------------
"There are 10 types of people in this world. Those that understand binary and those that don't..."

I get it if you really like working on complicated electronics but it seems like a lot of work when aftermarket products are available. I guess for some it’s the challenge not the results.

doesnt seem that complicated, would much rather throw this together then pay out someone to flash my pcm or buy my own hptuners for 400 odd dollars

It's very similar to a j-tag (for all you old-school satellite guys). And I agree, performing this mod cost next to nothing. If more of us work on the same platform, it would be much easier to share bin files.

Cheers!

quote Originally posted by Purple86GT: Hey guys! I found this site: Dump the flash from your 32 bit GM PCM. PCM Flash dump, Part 1, Modifying your PCM PCM Flash dump, Part 2, BDM hardware and software Would anyone mind downloading and posting the pictures and steps in case this webpage were to disappear?

Too late... "Not Found On This Server".

Darn. Sounded interesting.

Just wait a few days and it will be back.

I made a mirror of the websites : http://akroncdnr.com/ecm_info/32bit/dumpflash/

However I don't have the ftp files, & when I attempt to get them I am prompted for credentials. If you have them I would like to add them to the text.

The website is back up. I'm tempted to try this. Any one ever done it? I wonder if it would work on a 98+ GTP PCM.

No offense bro it seems to be a bit more work than 98% of all people wat to put into it... if you look around on forums you can always fin people selling dhp tuners and hp tuner software cheap. Hell I bought my hp tuners for 275 with 4 credits left. Which is enough to tune 2 cars.... its simple and tons of help on the main site if you get stuck... easier faster and no need to worry if you do something wrong its pretty straight forward. Heck I even tune friends cars for just the cost of credits and that allows them unlimited tuning