1999 truck PCM's ROM

[Ken Kelly]

Jake,
 Last week I removed the two Flash chips from my 95 PCM. It was rather
non-destructive, and I put sockets in there place. I took a piece of copper
foil, and cut a hole in it just larger than the flash chip. I pressed it onto
the board surface to use a a heat protector. I then used a heat gun to remove
the chip. If you email me off list I will give you more detail on the procedure
I used. One of the techs at work who does a lot of Surface mount repair work
showed me the technique.

	Technology is moving forward. The 95 uses two 28F512 chips for a total of 1
meg. yours sounds like a 4 meg version, I thought the number should be 28F040
instead of 28F400. I know the 28F010 is a 1 meg chipm and the 28F020 is a 2 meg
chip.

		Ken

Jake Sternberg wrote:
> 
> I have a PCM (powertrain Control Module a.k.a. ECM)
> from a 1999 GMC sierra pickup truck.  The connectors
> are almost bigger than the circuitboard itself.
> 
> Well, anyway.. i have it open, and here's the info
> from the flash ROM chip:
> 
> Intel
> 16236995
> AB28F400BX
> E 5012
> U7400142Q
> Flash
> 
> 44 pins
> 
> It's a surface mount device, but i plan to solder
> little wires to it and to a connector so i can
> plug it into my ROM burner (while it's in vivo).
> 
> Does anyone have any suggestions or information
> as to whether this could be a bad idea or has
> anyone done it?  I asked GM for a PCM programmer
> kit but surprisingly, they refused to give me one.
> 
> Thanks!
> 
> -jake  chickens at mail.utexas.edu