Toyota DIY'er

[H Villemure]

Chris,

thank you an awful lot for the information. I will keep digging for more
information on the subject. I think that I will also self-educate with the
68HC11 regarding ignition and mixture management, this information seems to be
well covered. When I am more up to the current level of knowledge I will try
my best to spread the word with Toyota/Nissan/Mazda lovers :) :).

Later,

Chris Conlon wrote:
> 
> 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.
> 

-- 
Helene V.
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