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Old 07-24-2007, 11:49 AM   #1
amr_old
Scooby Newbie
 
Member#: 154839
Join Date: Jul 2007
Default Need Help on swapping engines

Dear members,

Hope all is well…I need help on my project

I have a 1999 Subaru legacy with an engine (EJ25 GX A/T) and recently bought a (EJ20 TT M/T) and am working on swapping engines. I had no Technical problems until I reached the electrical part where I am very lost.



The problem that I am facing is that the old engine has an ecu W9 (w9--22611AG120--A18000D2A--9Y19) and the new one has an ecu Y9 (Y9--22611AG302--A18000D3U--0Y14). The electrical circuit in the car has a different plug that connects the old ecu W9 then the new ecu Y9. I don’t want to change the whole circuit because several reasons for example:

1) The old circuit that I have on it is for a left seated car where the driver seat is on the left seat and the new circuit is for a right seated car where the driver seat is on the right.
2) The old circuit that I have on it is for full automatic options (ex: Air condition is automated) and the new circuit is not for a full automatic.


So what happened was when I changed the old circuit to the new one a lot of functions in the car didn’t work a small example the head lights did not work along with a lot of other functions….

I need help on how to modify the wires from the old circuit or ecu to work with the new ecu with the full functions working. I have an idea on how to do that but just don’t know which wires are which. Do I need to find a Circuit Diagram? If so, how do I find it where I have been looking every where with no results?

What should I do to solve this problem??? Please advice where I can't wait to finish the project and enjoy the extra power!!!

I hope I made the problem clear…If not please ask me to explain more!!!
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Old 07-25-2007, 02:42 PM   #2
Smoby
Scooby Specialist
 
Member#: 97642
Join Date: Oct 2005
Chapter/Region: SWIC
Location: Phoenix, AZ
Vehicle:
2002 Wrx Sedan
MBP

Default

Your best bet is to buy a standalone to run the motor and leave the old wiring/ecu for everything else.
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