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Hacking up Honda's ECU
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 Post subject: P75 TO P72 made easy
PostPosted: Fri May 13, 2005 3:37 pm 
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Joined: Thu Oct 28, 2004 1:48 am
Posts: 23
Location: nc-FL
First let me thank JIM TRUETT for hooking me up with the parts for this conversion.
This requires some kind of soldering skill, if you dont think your up to par; practice.

This covers directions in order to convert a p75 board(1980-1502) to a p72 with IAB's.
If you would like to have a knock sensor, just add a knock sensor board to FC1.

I used the directions on the wiki, adding/removing items from BOTH lists
http://www.pgmfi.org/twiki/bin/view/Lib ... 01980-1500

Parts list and locations:

Image

I know my paint skills suck, but...
Notes: 2361 is equivalent to C2785
2362 is equivalent to A143

Now you can start by adding these:
Image

Q37(note that Q37 was already present with a C2785)
R142, 143, 144
C60
a Jumper on J10
IC14

Since your already around there you might as well solder:
Image

D11

Move on to:
Image

Q34

In the middle:
Image

Q17
Q26

And finally moving on to the right side of the ecu;
Image

Add:
J-5(if applicable, my case already there)
J-3(if applicable, my case already there)
R107
C94(if app., was already there)
Remove:
J-4
R90
C71

and for the last step:
Image

R115
R116

Your P75 is now vtec and Iab's capable.Enjoy!!
Note that of course the ecu needs to be chipped in order to be able to apply your newly vtec'ed ecu.
I have not tested the IAB's function.


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PostPosted: Fri May 13, 2005 6:24 pm 
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Joined: Tue Jul 27, 2004 3:03 am
Posts: 1235
Location: Salem, OR
Wow! Nice write up! Now make one for the P12/14 to P13 conversion! Haha!


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