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Old 05-02-2003, 03:02 PM   #26
nizz
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I'm feeling generous today so here's a few important tips:

Be meticulous and label every wire you cut. Label it with at least the pin location number or better if you have a description of what the wire is.

Study the wiring diagrams for both cars and write down which pin location is the wire for what and try to match them up to the corresponding pin location on the new ECU.

Cut the wires so they are staggered. That way, when you clean up, there is less of a bulge in once place. Soldering and wrapping will make your wire thicker and you don't want all the thick wires in one place.

Study the differences between the wiring between your Impreza and the WRX. For example, the fuel pump relay is grounded by the ECU on the RS whereas on the WRX, it is grounded on the body. Make a note of the differences.

Make sure you look closely at the numbers of all harnesses, relays and connectors. The diagrams may have the same 4 wires listed but have them listed as 1, 2, 3, 4 and 3, 4, 2, 1.

Best thing to do it braid together the wires first and then go through and solder them all. Then wrap them in electrical tape.

Follow the diagrams closely for wire colors. Just because a wire is a certain color in the engine bay doesn't mean it'll be the same color after it enters the firewall.

I'm sure I have things I haven't covered but these are the more important stuff that remains prominant in my mind.

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Old 05-02-2003, 03:23 PM   #27
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Thanks smallcar and nizz. Both of those posts are very helpful.

-Jon
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Old 07-23-2003, 09:55 AM   #28
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Is there any splicing that can't be done by simply matching the coresponding pins on the two ECU and splicing the appropriate wires?? I haven't gotten my MY02 WRX bulkhead harness yet

Thanks guys
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Old 07-23-2003, 11:38 PM   #29
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where did you get your bulkhead harness from? i'm looking, but i may end up going jdm anyway.
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Old 07-24-2003, 03:27 AM   #30
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I AGREE THAT INFORMATION HAS BEEN HELPFUL FOR SOON I TOO WILL BE TRYING TO GET MY HANDS ON A EJ20T.THE THING IS I JUST BOUGHT A 95 IMPREZA L BUT WILL NEED HELP ON WIRING.I OWNED A FEW HONDAS(<---BE EASY ON ME) AND HAVE DONE SOME SWAPS WITH SOME BUDDYS OF MINE.BUT ILL ADMIT THAT THE MECHANICALS WONT BE TO BAD BUT THE WIRING WILL BE A LITTLE MUCH SINCE I AM NEW TO SCOOBYS(ALWAYS LOVED THEM!)AND HAVENT HAD ANY EXPIRENCE WITH THEM.I WISH THERE WAS A MANUAL OR SOMETHING OF ALL THE WIRING DIAGRAMS I COULD LOOK AT AND STUDY. WELL JUST TO LET YOU HUYS KNOW THIS FORUM IS DEFINETLY THE BEST FORUM IVE BEEN(NEWB)TO.
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Old 07-24-2003, 11:16 AM   #31
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If you have the actual connections, you should be able to use the wiring diagrams to get everything together. It would just be better to reference the harness and the diagrams to have two points of reference.

Boost4U, no I don't have access to another BWH; sorry.

-Jon
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Old 07-27-2003, 11:21 PM   #32
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Wow, this thread REALLY encourages me to go ahead with my swap now. Anyway, since we're all talking about swapping in a wrx ej20t what do you all think is the best route for me and my 96 legacy 2.2?
I've read a lot of different opions, everything from swapping the entire car harness over to just using the ecu. I'm thinking since my car is an automatic 2.2 as of now i might be ahead to put in the wrx harness. What do you guys think?
My goal is to swap in 02 wrx 2.0 and the 5mt that came with it. I would also like to use the wrx guages as well to have wrx bling (and a proper redline/speedometer etc.. ). I have the entire wrx harness too (unfortunately it's from a wagon and my car is a sedan).
Hopefully i'm not butting in on the guy's original post as this is somewhat different
Brent
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Old 07-27-2003, 11:32 PM   #33
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My strategy is going to be to lay out both harnesses and keep any wires that will continue to be used; ie: non-engine related. Those wires that will be needed from the WRX harness will be merged into my current harness to replace the unused wires from the previous engine.

In your case, serious, it may be beneficial to you to pull both harnesses and then start with the WRX harness and merge in any wires that are NOT engine related. Basically, the direct opposite of what I am shooting for.

I dunno, it could go either way.

-Jon
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Old 07-28-2003, 11:45 AM   #34
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sorry if this is going off topic, but would using an aftermarket ECU simplify this process. Would you still need to splice all the wires, or just connectors?

Anthony C
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Old 07-28-2003, 02:55 PM   #35
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Depends on what aftermarket ecu you went with. Some are wire in and some just plug in. Others plug in and have a complete wire harness for the engine included.
What is available all depends on your car. For me and my legacy they are all pretty much wire in. So to answer you question, yeah, it might be a little eaiser to just go out and buy a plug and play if you could. Even if you had to wire it in you would still have instruction which would be nice!
Brent
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Old 07-29-2003, 12:37 PM   #36
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Or you can hunt around for a cheap Unichip harness with the plugs to plug into the ecu... and whatever wires you have that can be used from the original ECu and whatever that isn't included you can wire your own.


Not hard and alot cheaper than a bulkhead harness.



Imprezd~

p.s. you will possibly have to swap a few things sensor wise but not too bad. Will probably finish sometime this weekend will give an update as well.
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Old 07-29-2003, 01:21 PM   #37
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what motor are you swapping in? and how many wires approximately need to be wired into the ecu plug?
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Old 07-29-2003, 01:22 PM   #38
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USDm will let you know when i am done.
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Old 07-31-2003, 12:53 AM   #39
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what we need to do is post which wires need to be spliced from the RS harness. thats assuming you're swapping into an RS.
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Old 07-31-2003, 09:58 AM   #40
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I am going to start a new thread with the pinouts and we can go through and figure things out. I thought it might become a sticky so that's why I will start a new one.
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Old 07-31-2003, 11:25 AM   #41
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Cool. As soon as i finish this summer school class next week i'm going to start on the wrx side of my harness. I really need the wiring diagram for a MY00 RS or at least the pinouts. Lets start a thread dude, i think this is a lot easier than people are making it seem, it just takes time to do it initially.
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Old 07-31-2003, 11:42 AM   #42
Imprezd
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It is easy the hard part is seperating the harness and staying interested in doing it...

That's why i am doing it my own way i guess... I am actually behind schedule as well.. so my notes won't be ready as of yet...

Imprezd~
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Old 07-31-2003, 11:44 AM   #43
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oh yeah, where'd you get the connectors for the engine side of the harness?
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Old 07-31-2003, 11:59 AM   #44
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My motor came with them..
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Old 07-31-2003, 02:02 PM   #45
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LOL, what a small world. My final summer class ends this Saturday. My drivetrain arrives Monday or Tuesday. Project starts that night... Once we all get going we should definitely pool our resources and get this wiring figured out.

I haven't decided if it is best to do all the mechanicals first and then do the wiring or do the wiring and then the mechanicals.

spiralsmurf, PM me.

-Jon
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Old 07-31-2003, 03:26 PM   #46
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as you can see the motor is in my car and has been in for a while I just haven't been able to devote time to the harness. My WRX takes priority lol.

It's fairly simple the first thing you want to do is sort out what you don't need to use in wrx harness and what you do need.

then you will want to loom as much of the wires that go to the same direction together.

You will end up with alot of wires... but what i have found works is that you cut and separate the wires that have crazy routes and make then as clean as as siimple as possible.

Try and weed out as much of the non engine related wires as possible.

Once you have both cars ecu diagrams and it should be a simple cut a tap situation since they alot of common sensors. Some are not so common too though.
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Old 07-31-2003, 03:34 PM   #47
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I'd be up for a stick on how to do this long as the information is good. I'll be doing my conversion in a 96 legacy so it will be somewhat different from the RS's but should have the same idea. I think if we all had a good point to start at then this entire wirring project wouldn't be so intimadating.
Brent
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Old 07-31-2003, 04:04 PM   #48
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stimpy, i'm with you. lets get the info out there. puckaveli already posted started a thread and as soon as i start my wiring i'll be contributing. also there are a few compability issues related to power steering, a/c, oil pump, and those types of things. we need to get a list of what works with what and what doesn't.
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