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Hacking up Honda's ECU
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PostPosted: Fri Apr 22, 2005 6:53 am 
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Location: Tampa bay, Florida
Thank's to MMuller for this previous post. Re-issued with pics visible:
After many tries and wonders why i could not get datalogging to work, found an error in the directions that comes with the board, if not an error its pretty misleading to noobs like me.
I took a couple of pics of the TTL to RS232 board, with the correct 4 pin connector pin out.

this is the board that im using

Image

this is how your CN2 should look like after soldering. Directions and pin outs can be found in the wiki;
http://www.pgmfi.org/twiki/bin/view/Library/OBD1CN2

Image

This is how your 4 pin connector to the TTL to RS board should look like.
On the directions with the board, notice that the pin numbers are reversed and shows pin #1 to be TX and #4 to be ground; the picture is also misleading.
going by #1 on the 4 pin connector is should be:
#1=GND(black)
#2=RX(white)
#3=+5(red)
#4=TX(blue)

Image

traces on the board and pin outs for the ST232A chip if anybody cares.

Image
Image

Hook everything up, place the board and be done.
Smile


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PostPosted: Fri Apr 22, 2005 11:58 am 
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So what exactly is wrong in the directions?


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PostPosted: Fri Apr 22, 2005 6:01 pm 
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Dan, Why don't you put it in the wiki rather than a sticky?


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PostPosted: Fri Apr 22, 2005 11:41 pm 
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I don't have this board, but it seems like there is 3 or 4 people a week who can't get it to work.

Mmuller was able to figure out how to correctly wire it and provided the pics above in order to correct his problems.


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PostPosted: Mon Apr 25, 2005 11:26 pm 
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hehe, i posted this and got no response.
isnt it ironic..dont you think(song)

good stuff ltdannear :D


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PostPosted: Tue Apr 26, 2005 7:47 am 
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Mmuller..

Do you have the original instructions? Can you scan/photograph or otherwise post them here or E-mail them to me?


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PostPosted: Tue Apr 26, 2005 11:19 am 
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let me dig around for them, i might have them


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PostPosted: Tue Apr 26, 2005 11:42 am 
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I have them...made a few kits myself, datalogged with one and it worked fine. :?:

The only thing that was ever wrong with his directions was the polarized caps that he changed out of the kits but didnt change the directions as far as I could tell...

Black is ground - Pin1
RED is 5v - Pin 3

And TX and RX are 2 & 4...

i think most people that get confused think you wire TX on the Board to TX on the ECU and same with RX, however, this is not the case. Its vice-versa...


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PostPosted: Tue Apr 26, 2005 7:54 pm 
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Quite possibly. that's why I'd like to see the directions... maybe I can identify where the cause of misunderstanding is and offer all NEWBS a good, quick & easy hookup diagram. :)


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PostPosted: Wed Apr 27, 2005 10:25 am 
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ltdannear sent you e-mail with instructions scan


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PostPosted: Thu Jun 02, 2005 9:41 am 
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Cheers!!

I've developed a similar board using a max233. It eliminates the need of the external capacitors. If someone's interested, I'll attach the eagle schematics here. All it took was the pcb price, conector, db9F, and max233. It all sumed about 3€('bout $3.6 USD). So if anyone's interested, just drop me a line and I'll attach the schematics here!


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PostPosted: Thu Jun 02, 2005 12:25 pm 
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Please do!


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PostPosted: Thu Jun 02, 2005 1:14 pm 
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I think a Wiki entry for these boards is in order. If you attach your schems Junglas, I'll move them over to the Wiki.


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PostPosted: Thu Jun 02, 2005 3:33 pm 
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Ok, so here it is the max233. The files are in eagle format. added screen-shots of the eagle files.


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PostPosted: Tue Jun 07, 2005 12:17 pm 
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Sorry, but the previous board has 2 errors. I hadn't conected the internal capacitors. :oops: :oops: silly me!

here's the revised board.

Sorry to everyone!


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