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Hacking up Honda's ECU
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PostPosted: Mon Nov 25, 2019 1:10 am 
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Joined: Sun Nov 24, 2019 8:25 pm
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I'm trying to upload a PDF but cannot even create a new post. This is experiment.


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PostPosted: Mon Nov 25, 2019 1:14 am 
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Ok, not sure what's going on, but when I try to post anything with the pdf, it returns me directly to a reply to post page, with a popup that says "uploading the file" but continues to scroll for many minutes without change.


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PostPosted: Thu Dec 19, 2019 9:41 pm 
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So, I could not upload the single PDF with all pages included. Maybe someone smarter than I can fix it. I've done a little touch up to the schematics, and done a bit of reworking where touch up wouldn't do. I'm hoping noone else has done this yet, lol, and that someone can add it to the library.


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PostPosted: Tue Mar 04, 2025 8:19 pm 
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Ok, apparently I actually DID re upload the P28 schematic after I repaired the damage to the PDF images, and just foryor about it? I def do not remember this. I'll just put some tags in this post so it's searchable.

P28
P06
Schematic
Diagram
ECU


Sorry for the confusion, anyone that has been looking for this.


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PostPosted: Thu May 15, 2025 8:03 am 
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Joined: Tue Mar 09, 2010 2:02 am
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Location: Zlín, Czech Republic
Hi, I just tried to view the schematics but the error message "The selected attachment does not exist anymore." was displayed.
May I ask you to reupload, maybe to some image hosting site like imgur etc.?


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PostPosted: Fri May 16, 2025 2:18 am 
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Location: Russia
I just cleared noise and watermarks from original pdf:
Attachment:
image1-4.pdf

Attachment:
image5-8.pdf

Attachment:
image9-11.pdf


P.S. max files size for attachment - 1 Mb.


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PostPosted: Mon May 19, 2025 9:10 am 
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Location: Zlín, Czech Republic
Brilliant, thanks a lot :idea:


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PostPosted: Fri Aug 08, 2025 4:09 am 
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Ok, here's my cleaned up version, sans watermarks and photocopy noise. Let's see how long THIS one survives :rofl:

https://github.com/imtheman0313/Honda-Civic-P28-ECU


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PostPosted: Fri Aug 08, 2025 4:38 am 
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Another note:

I would like everyone using these to remember that the definitions of the pin locations in this document match the Honda connectors. If you come across the very nicely done (otherwise) and colored chart of pinouts for the P06/P28 ECUs, you have to do some counting, because they counted the pins totally wrong.

Maybe, if it interests me later, I'll also find that file, and repair it to match the actual Honda documentation.

BUT, these things are well beyond EOL at this point, so maybe I'll just leave well enough alone.


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PostPosted: Sat Aug 30, 2025 7:00 am 
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Now that I'm on the correct device, here's the P28 pinout, with all the WRONG pin definitions (according to the BOMARC schematic and pin numbers on the ECU).

This doesn't mean this image is useless, just that you cannot use the schematic versus this pinout as a 1 to 1 correlation, you have to count the pins. The pinout image starts from the wrong side, and counts the wrong direction :lol: :lol:
Attachment:
obd1.pin.schematics.gif


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PostPosted: Sun Aug 31, 2025 7:39 am 
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Ok, finally got around to fixing the pinouts image. I'll post the image here, and on the github.



Attachment:
FinishedP28PinoutCORRECTED.png


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