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Old 07-19-2005, 12:15 AM   #1
legacy2003
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Default need some serious help with some wiring issues on a rex swap into an rs

hey,

over the past week and a half i have been working on a 2003 wrx motor swap into my 2000 2.5rs. to start off, the motor is fine. now, the issue first arose when we were attempting to start it, and we noticed there was no power going to the fuel pump controller or ecu. we cut a wire and then jiggled the harness around and somehow it started right up. every wire has a solid connection. we then shut the car off and began wrapping up the wires neatly so we could start putting everything back together.

however, after this, we attempted to start it again, and the starter worked, but we found no power going to the fpc/ecu/sensors (blue/green and blue/red wires). we traced this back to the relay (brown one) and found that the relay was receiving 12v, yet it was not sending the power out to everything when the key was turned. my car does have a very extensive alarm system, which we proceeded to rip out because it does have a starter kill feature. we wired everything the way it would have been stock, and there is still no power. we tested the relays and they are fine. we even swapped in a spare set of relays and the issue was still there.

so, basically, there is power coming from the battery to the relay, and there is continuity between all the wires on the opposite end of the relay and all the places those wires run to. somewhere, there is an issue. we are completely stumped now, and i really need to get my car running. does anyone have any idea what could be wrong here?
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Old 07-19-2005, 12:55 AM   #2
Ver.III
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Main relay has two power outputs. One usually goes to the ecu, coils, boost control valve, air control. The other is power for the O2 sensors and such. The wires that trigger the main relay most times is ign +12v and the ecu controls the ground side. If thats the case, just ground the relay out.
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Old 07-19-2005, 01:04 AM   #3
legacy2003
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okay, i know its something very simple thats causing this all not to work. there is no power to the ecu, so hence there is no ground. you think by grounding the relay out that this will somehow get the relay to work? im going to ask my buddy that's doing my wiring if we've done this at all yet. it seems relatively simple. any other ideas as to what may be going on?
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Old 07-19-2005, 01:43 AM   #4
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v3 are you saying that if the ecu isnt hooked up the relay wont produce the 12v on the yl and yr wires ?
if thats the case i know what wrong..
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Old 07-19-2005, 09:32 AM   #5
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If your using the stock RS main relay, normally the ecu controls the ground side. The GD doesn't . So as long as one side of the relay gets 12v with ign on, ground out the other side.
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Old 07-19-2005, 12:18 PM   #6
legacy2003
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okay that makes sense, but how exactly do we do that?
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Old 07-19-2005, 01:01 PM   #7
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I just took the little green/black wire and make soddered a ring connector to it and grounded it to the chassis right where the power steering controller went.

Randy
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Old 07-19-2005, 01:50 PM   #8
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You know I looked at the ECU pinout listing for both the RS and ECU and neither one I had mentioned a main relay control wire from the ECU to the main relay. But in the schematics both of them have a wire that goes from the ECU to the main relay. On the WRX it is pin A6 and on my 98 RS it was pin 83? I think. They are the same color on the relay and on both ECUs.
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Old 07-19-2005, 06:27 PM   #9
legacy2003
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Quote:
Originally Posted by Randoramma
I just took the little green/black wire and make soddered a ring connector to it and grounded it to the chassis right where the power steering controller went.

Randy
when i say we disconnected some random wire, it actually happened to be a green wire. i want to say it was a green/black wire. do you remember what that was for?
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Old 07-19-2005, 07:16 PM   #10
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Green/white wire is the one I have as the main relay control wire.
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Old 07-19-2005, 07:30 PM   #11
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The "self-shutoff control" (B135 Terminal 19 on '01 RS ECM) is the wiring your guys are talking about right?

It isn't listed in the ECM I/O Signals in the WRX pinouts I had. But I found the main relay in the schematics and traced it to the ECM in the GD WRX aswell. I can't remember the pinout for the WRX at the moment...

I believe it's the Green/Black wire everyone is talking about. Can't remember if it's that color in the Ver7 chassis harness I had.

-Tim
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Old 07-19-2005, 11:00 PM   #12
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That would be the Light Green wire that I was talking about earlier. It's either Light Green/White or just Light Green. It goes to A6 on the WRX ECU. On the WRX harness it's the same color as the RS, at least on mine. There are only 6 wires on the main relay. A ground, 2 inputs, 2 outputs, and that single wire that goes to the ECU.
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Old 07-20-2005, 11:14 AM   #13
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No, the one I am talking about is the light green/ black one on the RS main realy (which I am using). I believe its in pin #1 or #2 on the realy. It used to go to the RS ecu where it was grounded, but now it goes to the side of my chassis.

Randy
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Old 07-20-2005, 12:18 PM   #14
dwx
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Odd, my 98 RS main relay only has a light green/white wire, and the 99 diagram I have only mentions a light green one. It's pin #2 on the relay.

Last edited by dwx; 07-20-2005 at 12:28 PM.
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Old 07-20-2005, 05:57 PM   #15
Randoramma
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Mine is a 00.. that could account for the wire color differences. And I know what you are talking about here,

Quote:
It isn't listed in the ECM I/O Signals in the WRX pinouts I had (got mine from ravensblade). But I found the main relay in the schematics and traced it to the ECM in the GD WRX as well.

I experienced the same thing, so I just decided to ground it. In fact my buddy who was helping me made a joke that my solution to everything was, "just ground it." LOL
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