Toyota DIY'er

[Chris Conlon]

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Helene V. wrote:

> Hey, funny, when I subscribed to diy_efi I asked the same about
> microcontroller programming... (got no answer)

Oops, I figured someone would have answered that.

The only thing I've ever really seen to let you tweak the on-chip code in
Toyota ECUs is the Techtom stuff that G-Force (and others?) use(s). I
think it's similar to something another poster mentioned recently: you
use a feature of the microcontroller to read out the onboard rom, modify
the code, and the program an EPROM version of the same microcontroller
with your new code. (And/or make an adapter board, and force the existing
micro to read the code & data from an external EPROM.)

Techtom apparently even offer training classes for tuning various ECUs,
once you buy their $$$ setup.

As the other fellow said, it could be a fun project, but it's gonna be
a fair bit more work than downloading a bin file, burning an EPROM and
swapping it in.

I seem to remember hearing that the ECU in question was an 8051 or variant,
but I could be totally wrong here. I used to have URLs for a little bit
of Techtom & G-Force info, I can dig for them if you're interested in
going this route. Also the MR2 list is in the middle of a big group buy
on G-Force upgrades for the SW20, and it seems like the G-Force people
aren't *too* tight-lipped about the tech details.

   Chris C.

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