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Hacking up Honda's ECU
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PostPosted: Sun Jan 31, 2016 3:30 am 
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Hello everybody! :D

First, i'm happy to see this forum back, hurray !

Here's my problem:

My engine wiring loom melted and i suppose that the +12v was in contact with some sensors wires :shock:
Actually , my P28 ECU give me code 6 and 10.

I have a spare P28 and i switched some parts between the 2 ECU to find wich one is fried... but without success.
Does somebody have any idea of where to look at ?

( part switched: IC5 and IC6 )

Thanks for the help and sorry about my bad English :oops:


Last edited by seven40 on Sun May 07, 2017 1:52 pm, edited 1 time in total.

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PostPosted: Tue Feb 02, 2016 8:21 am 
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So i decide to test my board by replacing HIC1 converter with one from a spare ECU.
We will see if the solution sits here :D


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PostPosted: Thu Feb 11, 2016 1:06 pm 
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Not find enough time to do the replacement :oops: , the HIC1 daughter board is very hard to desolder and i'm scared to break something :cry:

I'll try quietly this week-end and i will see if my problem will be solved or not.


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PostPosted: Sat Feb 13, 2016 5:57 am 
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Ok, HIC1 board is replaced but still the same result code 6 and 10 ...

I also tried to replaced IC17 and it's not better so now i don't know where to look at :oops:

Does somebody has any idea? :D


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PostPosted: Sun Feb 14, 2016 3:21 am 
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So i find that HIC1 daughter board is used for the distributor sensors, so it is not involved in my problem :oops:

The only things i didn't replace are C33 and C38 tantalum capacitor, is it possible that the solution of my problem sits here?
I think that no but i'm going to try...

For memory: DM2 DM3 and DM8 where replaced with known good components, same thing with IC 5 and IC 6 , the values on RM1 are ok ...


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PostPosted: Sun Feb 14, 2016 7:30 am 
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So i replaced C33 and C38 , i have to test on my car if this time it is working...


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PostPosted: Sun Feb 14, 2016 3:06 pm 
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... and still the same result, code 6 and 10 :evil:


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PostPosted: Mon Feb 15, 2016 10:28 am 
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But you DID change the sensors and the wire harness? Did the other P28 work in your car?


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PostPosted: Mon Feb 15, 2016 1:07 pm 
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My car run perfectly with my vtec converted P75, i also have a Demon with Neptune on it so i can see that my sensors and my wiring are all good.

The next step is to see if i have some voltage on the pin D15 and D13, to see if the sensors are feeded or not.

Somebody knows how the +5 volt is made by the ECU?

I also replaced all the electrolitic capacitors, the traces on the board are ok, so i don't know now where to look at :oops:


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PostPosted: Sun Feb 21, 2016 1:55 am 
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Still not find any time to look at this ECU, does somebody has any idea of where to look at?


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PostPosted: Sun Apr 17, 2016 10:02 am 
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So i start to build my "ghetto style" ecu bench, with a computer power supply.
I'm going to add oem sensors and for the igniter, i'm planning to use a spare igniter with a 12volts motor to make it turn :oops:

I know it seems "freaky" but i hope it will work :lol:

I have tested the power supply system, it works perfectly, just have to had the sensors and it will be ok!
If it works, i will take the time to do something "clean", hope that i will find my problem on my bad ECU with that system :D


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PostPosted: Sat May 28, 2016 6:25 am 
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Location: Malaysia
seven40 wrote:
So i start to build my "ghetto style" ecu bench, with a computer power supply.
I'm going to add oem sensors and for the igniter, i'm planning to use a spare igniter with a 12volts motor to make it turn :oops:

I know it seems "freaky" but i hope it will work :lol:

I have tested the power supply system, it works perfectly, just have to had the sensors and it will be ok!
If it works, i will take the time to do something "clean", hope that i will find my problem on my bad ECU with that system :D


Hi friend.
How the status?
appreciated if you can share here how you did the troubleshooting using PS system :)


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PostPosted: Thu Jun 16, 2016 1:05 pm 
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Actually it is in stand-by, i'm very busy but i'll finish it as soon as possible...


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PostPosted: Sun Jun 19, 2016 10:22 pm 
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seven40 wrote:
Actually it is in stand-by, i'm very busy but i'll finish it as soon as possible...

we will waiting for your result..:)


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PostPosted: Sat Jan 07, 2017 1:31 pm 
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Still not find enough time toworkon my bench but as soon as possible, i'll do it :D


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