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Hacking up Honda's ECU
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 Post subject: Help ECU p29
PostPosted: Fri Jun 18, 2021 4:27 pm 
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Joined: Wed Jun 16, 2021 5:23 pm
Posts: 2
hello i have a honda civic 94 EX with motor D16A9 and the ECU ODB1 p29 (37820-P29-I00-770-104526) is bad, i try to find this ECU but i had no luck, my question is if is posible to use another ODB1 ecu that is compatible ( ex. p28, p06 ) that will make the engine work fine with no problems.
and thank you for your help.


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 Post subject: Re: Help ECU p29
PostPosted: Fri Jun 25, 2021 9:14 pm 
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Joined: Tue Jul 27, 2004 2:10 am
Posts: 105
Location: SoCal
rich_21 wrote:
hello i have a honda civic 94 EX with motor D16A9 and the ECU ODB1 p29 (37820-P29-I00-770-104526) is bad, i try to find this ECU but i had no luck, my question is if is posible to use another ODB1 ecu that is compatible ( ex. p28, p06 ) that will make the engine work fine with no problems.
and thank you for your help.


You can try using a manual P06 ecu.
What exactly is wrong with the P29? no fuel pump? how do the capacitors look? any fuzz or black leaks on the main board?


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 Post subject: Re: Help ECU p29
PostPosted: Sat Jun 26, 2021 11:20 am 
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Joined: Wed Jun 16, 2021 5:23 pm
Posts: 2
thank you Katman, the problem with the P29 ECU is that it doesn´t prime the fuel pump and also a check engine light ON with no codes, change the main relay, and also all the capacitors.

i been told that i need to change the IC17, and also the Q3 transistor because is leaking but with this Q3 i don´t see the part number, I have been researching and in a forum found tha it´s 2SD1779, and now trying to find the replacement for Q3


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 Post subject: Re: Help ECU p29
PostPosted: Mon Jul 26, 2021 1:00 pm 
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Joined: Tue Jul 27, 2004 2:10 am
Posts: 105
Location: SoCal
rich_21 wrote:
thank you Katman, the problem with the P29 ECU is that it doesn´t prime the fuel pump and also a check engine light ON with no codes, change the main relay, and also all the capacitors.

i been told that i need to change the IC17, and also the Q3 transistor because is leaking but with this Q3 i don´t see the part number, I have been researching and in a forum found tha it´s 2SD1779, and now trying to find the replacement for Q3


Betting it's IC17.
IC17 is key way to several important ECU functions.
I recently replaced caps and then IC17 on a P28 that was acting 'dead'. No FP activation, no injectors firing, nor any regular ecu functionality that the test bench LED's were showing. After IC17 was replaced (last item I replaced after all the caps replaced).... boom back to life.


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