Reading/ Reflashing 29F chips - electrical gurus?

[chri0029]

It was out of a '04 Grand Am GT. 3.4L

I'm going to try my soldering skills this weekend with an IC from an old broken laptop. I've been reading online and actually getting interested in unsoldering the chip and installing a DIP in its place. The experienced soldering guys make it look so easy on YouTube. Chips are pretty cheap if you burn one.

I want to try this hardware direction in case your ALDL cable hacking doesn't work. My goal is to have something working (either your way or mine) in the next few months when this damn snow goes away and I actually want to get outside and tune.

I'm still interested if anyone has done this before (soldering/unsoldering the IC) or setting-up JTAG wires.

[Weatheralls Auto]

I am currently working on this, just waiting for another piece of hardware.

What Vehicle was that PCM out of? a CAN maybe?

That Flash is the newest I believe for GM, earlier ones are AM28F400BX

[chri0029]

Here are the chip specs including pin outs and read/erase/write commands. Probably similar to other GM 2004 V6 PCM's.

[chri0029]

Okay, so I've been doing some forum reading in the past month trying to figure a way around making someone really rich by buying software costing >$500+ that only works with 2 VINS for later OBDII's. Completely a rip-off in my opinion unless you're doing this comercially. The DIYer with only a few parameters to change should be able to do this somewhere in the $100-$200 range (without limiting VINS). I'm really surprised the DIY market hasn't driven this (maybe in the future with J2534 lobbying for emissions regulating for 'aged' component cals rather than stock ones based on new component wear). Different discussion for a different day.

It seems nobody has found a good way (YET) to reflash newer OBDII's through the J1962 ALDL without making certain software companies really rich. Hopefully that comes soon. That leads me to "plan B" for the meantime - reflashing directly the chip.

I bought a bone yard PCM for $30, and it turns out the stock chip in that PCM from my research is actually pretty common & powerful. It's a 2x22 pin AM29F400BB chip with 8/16bit flash memory. It even has a built-in algorithm for reading, erasing, and writing.

There is so much information out there about removable OBD1 & 1.5 chips & reflashes, but not much about post-2000 OBDII reflashes. The little information I do see involves reflashing the chip mostly through Burn2 or Willem EPROM programmer hardware, but with the chip removed from the motherboard. However, removing that soldered chip is not my cup of tea unless absolutely necessary. I don't think I could solder in a DIP socket into the board reliably for easy chip removal.

Has anyone done any reflashing of the chip while in the board or removed a soldered chip? I attached my AMD chip specs, including pin-out. It appears that only a few pins are used to read/erase/write (most likely only the CE#, OE#, VIL, WE#, and BYTE# pins) That's it!? Therefore, soldering or hot gluing wires directly to the board would seem the most logical rather than removing my entire chip. Then possibly hook the wires directly to a Willem programmer or another pass-through device to a computer to read/ erase/ rewrite the bin? Or even JTAG directly to a PC through the parallel or serial port? I have done this before on a simple computer application, but not ever a PCM. Has anydone done this successully? Any ideas/ advice in this area from the electrical gurus?