Modifying stock Mazda/Toyota ECU's

[Martin Petersen]

[ Possible repost sorry - This message was never sent to me via 
my digests, so I think it never made it - Or possibly your own posts 
dont get sent to you?.. ]

Hi everyone, 

I've recently been pulling a couple of EFI computers I have apart 
with the hope of being able to do some software modifications to 
them, but after opening them, most the IC's inside are all a bit 
unknown to me. Can anyone help for a start by identifying some of 
them, and maybe information on if I have any hope of 
reprogramming these? 

The first is from a Toyota MR2 2.0 turbo, 1992 and a picture of the 
ECU is available at:  {HYPERLINK 
"http://www.rat.ltd.net/mr2/pics/800x600/dcp_0358.jpg"}http://www.r
at.ltd.net/mr2/pics/800x600/dcp_0358.jpg 

Markings: 

D 151803-9651 5 A41C-2-8288 

D 151803-9661 5A41C-2-8646 

D 151804-1010 572 307N 

ND MG358 

ND SE123 

The second is from a Mazda Familia GTX, 1800cc Turbo (1989). 
This is a  'Denso' brand ECU. No picture on the web (I can email if 
anyone is interested), but some of the markings are: 

D 151821-0020 (24 pin) 

D 151811 0360 (28 pin) 

ND MP5250 (Big, 42 pin Microcontroller looking thing) 

ND MP492 (24 pin) 

And then theres a couple of 4000 series chips, and a NEC 
uPC177! finally something I recognise!! 

I presume the 'ND' prefix i(And most likely 'D' prefix also) are Denso 
made devices, but I'm hoping the Micro is a 8051 or similar 
derivitive. 

So, can anyone help!? Please! 

Martin. 


--
Martin Petersen 
NIWA Instrument Systems
Kyle St, Riccarton, Christchurch, NZ.
Ph +64-3-343-7890 
Direct Dial Ph +64-3-343-8028
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