ECU O2 Wires?
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This is a discussion on ECU O2 Wires? within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; I'm trying to hook up my Apexi TT to the O2 sensor. I have some confusion on what wires the ...

  1. #1
    Registered User Jared's Avatar
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    ECU O2 Wires?

    I'm trying to hook up my Apexi TT to the O2 sensor. I have some confusion on what wires the O2 + and - are. I've read a post stating that the O2 - wire on the ECU is the Red w/ Green stirpe and the O2 + is the White wire which are both on the 2nd plug from the right side of the ECU. The problem I have is there are 3 white wires on that plug. So I've looked and cannot find a WRX service manual in my dumpy little town. Can anyone help on providing which white wire to use?

    Thanks,
    Jared.
    Damn, the Temporal Prime Directive!

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  3. #2
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    I'm in the same boat as you. There's a thread here or on I-Club that says which wire it is. I had it a second ago, but lost it.

    PM me if you want to talk about it. I plan on hooking it up tomorrow.
    2003 Toyota Tacoma Xtra Cab 4x4 V6 w/TRD
    2006 Honda Pilot EX with Leather/Nav
    2002 Acura TL-S (for sale)

    2002 Blue WRX, gone but not forgotten
    2005 WRX STi to be...?

  4. #3
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    I might have found it..

    Here's a post from BigRich:

    Tapped the B17 (white) wire for the (+) Rear O2 sensor. Also tapped the B17 (red w/ green stripe) for the (-) O2 sensor. These wires are found on the second harness from the right on the ECU. Just be very careful and tape everything back up as it was. Everything seems to be pulling correctly. Just not sure how accurate the #'s are on the Apex unit. But for $100 I can't complain.

    I'm going to look around to confirm this. I'll update what I find, if anything. If anyone else may know, PLEASE post!
    2003 Toyota Tacoma Xtra Cab 4x4 V6 w/TRD
    2006 Honda Pilot EX with Leather/Nav
    2002 Acura TL-S (for sale)

    2002 Blue WRX, gone but not forgotten
    2005 WRX STi to be...?

  5. #4
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    Correction, BigRich put a new post stating a mistake. The white and black wires from the relay go here:

    White--B17 on connector B135 (middle top connection)
    Black (ground wire)--B19 on B135

    I'm confirming this with him and splicing the wires today. PM me for an update.
    2003 Toyota Tacoma Xtra Cab 4x4 V6 w/TRD
    2006 Honda Pilot EX with Leather/Nav
    2002 Acura TL-S (for sale)

    2002 Blue WRX, gone but not forgotten
    2005 WRX STi to be...?

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