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Old 09-21-2008, 04:48 PM   #1
BlackFlame
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Question 2.5i-STI ECU Pinout Help ?

Hi all- Im posting up in hopes that anyone with info and knowledge of the topic will be able

to point or help me find the correct direction and train of thought with this. Here's my

thought/proposal...

Little lengthy... My car is a 2006 Impreza 2.5i N/A. The car DOES have drive by wire and the main engine harness-to-firewall-plug is the same (i have included a picture below) as an 07 STI.

I am currently building up an STI engine that I would like to swap in. I know the motor bolts into the car, I know Ill need a beefed up transmission, I know my accessories will fit on the motor (alternator, AC pump, steering pump...etc)....I have most everything I need to make it all work...the only real issue I am running into is wiring or basically controlling the STI engine. I know that swapping in the entire dash harness etc. would control the engine without issues (yes its a factory setup)....but in recently helping a friend with their entire dash/engine swap...its just more than I want to take on with my two year old car. As many on here know, its not the easiest thing to do nor the fastest (taking care to swap out the dash/wiring and all that takes a long time..something I would like to somewhat avoid).

--Am I able to plug in an 07 STI engine harness, into my firewall-to-dash harness and re-pin the wires controlling the engine that go into the ECU to make it work ? Yes the color coded wires may need to be switched...

I know my car lacks TGV's...but I did TGV deletes on the motor anyhow (the code could be deleted out). I know the 07 ECU also uses the immobilizer setup...in theory, if I am re-pinning the ECU wires, could I pin them into an 04 STI ECU which doesnt use the immoblizer setup (and from what Ive been told is more tuneable than an 07 ECU) ????

Ive talked to a bunch of my subaru buddies around here and while they seem to get my idea and that it could work, they cant give me solid answers or info. Hence, why I am posting up on here.

So what do you guys think ? Possible ? I am wasting my time bothering with a thought like this ?

Ive searched and really havent seen too much info on somethin like this..

Thanks for any help.

Pic of harness plug (left side of pic)
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Last edited by BlackFlame; 09-21-2008 at 05:41 PM.
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Old 09-22-2008, 10:18 PM   #2
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That epic of a fail for a thought huh
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Old 09-23-2008, 06:23 AM   #3
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Ravensblade, a multimeter and an eternity...or call East Coast swappers and see how they can help.
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Old 09-23-2008, 08:14 AM   #4
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Originally Posted by Spiider View Post
Ravensblade, a multimeter and an eternity...or call East Coast swappers and see how they can help.
Really think it would take that long huh ?
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Old 09-23-2008, 03:48 PM   #5
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Well, it wouldn't take "an eternity" if you are really familiar with wiring /electrical diagnosis and possess all three wiring diagrams and a good multimeter.
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Old 09-23-2008, 09:49 PM   #6
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Quote:
Originally Posted by Spiider View Post
Well, it wouldn't take "an eternity" if you are really familiar with wiring /electrical diagnosis and possess all three wiring diagrams and a good multimeter.
I think im confident in all of those..especially if I am able to have all the wiring diagrams/pinouts in front of me before hand...and figure out exactly what needs to be switched to where....

Hmmm..maybe i do have a chance
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Old 09-24-2008, 09:47 AM   #7
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I would make a big spreadsheet in excel and transpose all the pinouts to it so you can look across and see what needs to go where and what is already in the right place.

You may find it isn't that bad.
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Old 09-24-2008, 01:00 PM   #8
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Quote:
Originally Posted by Spiider View Post
I would make a big spreadsheet in excel and transpose all the pinouts to it so you can look across and see what needs to go where and what is already in the right place.

You may find it isn't that bad.
I will indeed...like a giant tables/columns sheet to line things up and check the pins positions...very sweet plan indeed...only thing ill really have to dig for is the color charts...cause it'll basically be 07STI engine -> 06 2.5i firewall/dash -> 04 STI ECU

Im hoping to find its not too bad...
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Old 09-24-2008, 04:21 PM   #9
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This would be very difficult to make work because the NA engines run all the plugs for the engine harness through the firewall right to where the turbo would sit. I'm not sure what the ECU pins look like on the 06 NA Impreza but on everything else the plugs AND pins are completely different and therefore do not allow you to repin.

Your best bet is to get the correct harness and put it in in place of the current one.
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Old 09-24-2008, 04:24 PM   #10
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What I do in my *real life* job when the wiring gets too complicated....

Make a sheet with everything you know on it, one column for each side of a connection and add all the info you can as far as function and wire color. In this case I would start at the ecu an work towards the engine.

Separate it into large blocks for each major section. ie. 2004 ecu, 2006 loom, and 2007 engine. In between the larger blocks you can leave space for translation and notes....
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Old 09-24-2008, 11:13 PM   #11
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Quote:
Originally Posted by Zephyr View Post
This would be very difficult to make work because the NA engines run all the plugs for the engine harness through the firewall right to where the turbo would sit. I'm not sure what the ECU pins look like on the 06 NA Impreza but on everything else the plugs AND pins are completely different and therefore do not allow you to repin.

Your best bet is to get the correct harness and put it in in place of the current one.
The wires are positioned where the turbo would be yes, but they are also the same length as the 07 STI wire-loom in that section...so to simplify I could always just move the wires to run along the shock tower as they do on the STI...its about a 6 inch difference...not a big issue at all.

As for the pinouts...all of the pinout diagrams I have show ALL the ECU's to have the same exact plugs....they are simply "pinned" in different positions...they could be switched no ? Where you saying that (for example) an 04 STI ECU pin is different than an 05 STI ECU pin ? ( I just wanna make sure Im reading it right)

Quote:
Originally Posted by Spiider View Post
What I do in my *real life* job when the wiring gets too complicated....

Make a sheet with everything you know on it, one column for each side of a connection and add all the info you can as far as function and wire color. In this case I would start at the ecu an work towards the engine.

Separate it into large blocks for each major section. ie. 2004 ecu, 2006 loom, and 2007 engine. In between the larger blocks you can leave space for translation and notes....
Thats prob what Ill do...get as much of the wiring and pinout diagrams as I can...verify the info as best I can and then draw out a big-ass side-by-side-by-side block for each component (as u said... 04 ECU, 06 Dash, 07 Engine)
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Old 09-25-2008, 12:37 AM   #12
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Quote:
Originally Posted by BlackFlame View Post
As for the pinouts...all of the pinout diagrams I have show ALL the ECU's to have the same exact plugs
Are you sure??? I've done a couple of these swaps over the last 5 years and have yet to see a non WRX ECU plug that could be repined with a WRX ECU plug. I do see what you are saying regarding the engine plug on the 07 and you make a good point there.
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Old 09-25-2008, 10:15 AM   #13
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Quote:
Originally Posted by Zephyr View Post
Are you sure??? I've done a couple of these swaps over the last 5 years and have yet to see a non WRX ECU plug that could be repined with a WRX ECU plug. I do see what you are saying regarding the engine plug on the 07 and you make a good point there.
Im not 100% sure...but in theory it completely makes sense. Also, according to all the pinouts ive attatched or linked below...everything seems to be the same style/size ecu plug/connector. Now I am not sure if the actual pins connected to the wires going into the plugs are the same...i honestly dont know why subaru would use two different style plugs...but I have seen some dumb-ass things come from them...so I will have to pull back my passenger floor carpet and get to my ECU to verify..and ofcourse check it against the 07 STI dash harness/ ecu plugs.

-06 2.5i


-04 STI

-06 WRX (same plugs and all as an 07 STI)...i am still waiting to get my hands on the 07 STI ecu pinout thats all..thought id toss the wrx one in
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Old 09-25-2008, 11:13 AM   #14
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I guess Subaru has finally wised up. They have used many different plugs and many different styles of pins for the ECU. Repinning these plugs is not an easy task, the pins are very small and the clips that need to be released are very very tiny. This is not how I would take on a swap like this but then again it's not my car.

Best of luck to you.
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Old 09-25-2008, 01:22 PM   #15
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Quote:
Originally Posted by Zephyr View Post
I guess Subaru has finally wised up. They have used many different plugs and many different styles of pins for the ECU. Repinning these plugs is not an easy task, the pins are very small and the clips that need to be released are very very tiny. This is not how I would take on a swap like this but then again it's not my car.

Best of luck to you.
Thanks for the luck.. I mean in all honesty what seems to be simplier (as people on here have more experience with this stuff than I do)... Swapping out a WHOLE entire harness and basically tearing apart my car...or planning out wiring and re-pinning a bunch of wires. (I know its probably 100 wires...but still) ?

Also...with a full wiring harness swap there is the added expense of Auto hvac controls and box, different gauge cluster(i may need one anyhow)...and a handful of other things...

Im not being a dick Im really just trying to get the feel for what everyone thinks.
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Old 09-25-2008, 01:25 PM   #16
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I'd really listen to Zephyr. He's probably the best/most popular wiring guru not affiliated with a shop (ECS, GT, etc.)

Another thought is that you'll have to add in wiring for other stuff, such as the boost control solenoid.
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Old 09-25-2008, 01:56 PM   #17
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Quote:
Originally Posted by silentt View Post
I'd really listen to Zephyr. He's probably the best/most popular wiring guru not affiliated with a shop (ECS, GT, etc.)

Another thought is that you'll have to add in wiring for other stuff, such as the boost control solenoid.
Yes he is MUCHO helpful so far...and I dont mind adding wiring... I knew/know I would have to add wires for a boost control solenoid and Im sure there are a few others...but again...people run UBER amounts of wiring for their aftermarket hid kits, steroes, alarms and gauges so an extra few for ECU engine control isnt a huge issue to me...thanks for pointing that out though
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Old 09-26-2008, 12:34 AM   #18
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Quote:
Originally Posted by Zephyr View Post
I guess Subaru has finally wised up. They have used many different plugs and many different styles of pins for the ECU. Repinning these plugs is not an easy task, the pins are very small and the clips that need to be released are very very tiny. This is not how I would take on a swap like this but then again it's not my car.

Best of luck to you.
What he said. My wiring pin tools were no use there. You're best of soldering or else you'll damage the plugs.
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Old 09-26-2008, 01:06 PM   #19
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What he said. My wiring pin tools were no use there. You're best of soldering or else you'll damage the plugs.
Possibly...Ill have to examine the pins and see what the crap they look like before choosing a route.
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Old 09-28-2008, 12:00 AM   #20
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Thread on STI swap into my 2.5i is coming soon....mine will be running in a week. Rotated 35R and 6 spd equiped! Wiring can be easy. Replace your dash harness with 2004 STI and use 2004 STI Ecu. Now you will not need the immobilizer. Everything plugs in, however you will have to switch to auto climate controls which I did as well. I know I am not the first, but I am pretty confident that mine will be the most complete.
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Old 09-28-2008, 10:44 AM   #21
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Quote:
Originally Posted by 2.5iSTI View Post
Thread on STI swap into my 2.5i is coming soon....mine will be running in a week. Rotated 35R and 6 spd equiped! Wiring can be easy. Replace your dash harness with 2004 STI and use 2004 STI Ecu. Now you will not need the immobilizer. Everything plugs in, however you will have to switch to auto climate controls which I did as well. I know I am not the first, but I am pretty confident that mine will be the most complete.
A lot of what you did I am trying to avoid though....I DONT want to swap in an entire dash harness OR the auto-hvac controls.

Thanks though
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Old 09-28-2008, 08:06 PM   #22
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I would not know why not... I promise it is easier and much quicker than what you are doing. I had all of the harnesses and a/c swapped out in one day. You will spend a week just trying to figure out where to start on your wiring. This swap goes far beyond the wiring though. You might also want to pick up a WRX engine cradle as well so you will have some room for exhaust components. Also don't forget that you have a returnless fuel system and will need to run a return line. The list goes on, but I will try to cover most of it in my thread to help out anyone else going this way.
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Old 09-28-2008, 08:52 PM   #23
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I would not know why not... I promise it is easier and much quicker than what you are doing. I had all of the harnesses and a/c swapped out in one day. You will spend a week just trying to figure out where to start on your wiring. This swap goes far beyond the wiring though. You might also want to pick up a WRX engine cradle as well so you will have some room for exhaust components. Also don't forget that you have a returnless fuel system and will need to run a return line. The list goes on, but I will try to cover most of it in my thread to help out anyone else going this way.
Thanks...have a turbo engine cradle/crossmember already in the garage and I know about the return line (what the F*$% subaru ?? )...in all honestly tearing apart an entire dash and half of an engine compartment sounds easier than re-pinning say 50 wires ? hell even 100 wires ?

I mean im not being an ass im just trying to convey my idea of...for example.... lets say the TPS signal ground wire (just an example) is in slot b135 #14 on my 2006 2.5i, but, on the 04 STI ECU it in slot b134 #20... in theory, cant that simply be pulled out of my 2.5i pin spot and placed in the 04 STI spot ? ( i hope i explained that correctly) .. i think thats what a bunch so far in the thread are agreeing with as obtainable

and by my statements in the just above post please dont think that im not taking anyones ideas and thoughts from earlier in the thread, into my plans..im gonna lay out all the wiring plans, make up my own sketch and layout and see if this is really doable on paper first...i really do appreciate everyones feedback so far...

now whos got an 07 STI ecu pinout for me
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Old 10-01-2008, 02:32 PM   #24
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Finally got the 07 STI ecu pinout....surprisingly that and the 06 2.5i are REALLY really close to having almost every pin in the same spot..

Something thats throwing me off is the 06 2.5i pinout is saying there are two slots for CAN communication... W T F is that...do our base model cars have this type of technology or did I miss something ?
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Old 10-01-2008, 09:13 PM   #25
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You should have asked, I could have given you the 07 ECU pinout long ago. I didn't see you asking for it so I didn't say anything.

As for the CAN, I think it has to do with the auto HVAC. I didn't hook those wires up when I swapped in my 07 STI and am not missing any features.
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