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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?

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.