 3sgte o2 sensors |
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 Mar 31, 2006 - 5:50 PM
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Enthusiast  Joined Mar 3, '04 From Hollywood, MD Currently Offline Reputation: 6 (100%)  |
im having trouble finding on my harness a spot for the downpipe o2 sensor? do i not need one?
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Mar 31, 2006 - 8:36 PM
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Enthusiast Joined Dec 5, '05 From LA, CA Currently Offline Reputation: 1 (100%) |
QUOTE(brianforster @ Mar 31, 2006 - 2:50 PM) [snapback]416216[/snapback] im having trouble finding on my harness a spot for the downpipe o2 sensor? do i not need one? The connector for the downpipe O2 (the main one) should be onthe harness that goes to the front of the motor with the A/C and Alternator wiring. The plug clips on a small bracket on the alternator when installed correctly. -Charlie -------------------- 2003 Subaru WRX Wagon
1989 Camry Alltrac LE 3S-GTE - SV25/ST205 hybrid 1988 Camry Alltrac LE - BEAMS swap started |
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Apr 1, 2006 - 12:43 AM
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Enthusiast Joined Mar 3, '04 From Hollywood, MD Currently Offline Reputation: 6 (100%) |
ok thanks will look again tomorrow
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Apr 13, 2006 - 6:54 PM
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Enthusiast Joined Mar 3, '04 From Hollywood, MD Currently Offline Reputation: 6 (100%) |
i have looked all around my alternator and the wiring in that entire area coming from the harness and i cannot find this damn plug, is it possible that i dont have it? a 92 jdm mr2 3sgte?
mark says he had one up there but i swear i cannot find the clip, i even tried tracing all of the wires coming from the harness, can someone tell me what color wires i should be looking for? |
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Apr 13, 2006 - 7:22 PM
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 Enthusiast Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%) |
i THINK its a white wire
-------------------- 15PSI - 30MPG - Megasquirt Tuned
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Apr 13, 2006 - 10:39 PM
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Enthusiast Joined Jul 10, '05 From Monroe, WA Currently Offline Reputation: 6 (100%) |
it is.. i dont have my 3s harness here it was left behind at my parent's house when i took my car home. Ill check it out this weekend when im there for sunday.
-------------------- 94' ST Coupe - 5sfe Motor swap and brake swap.
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Apr 14, 2006 - 11:03 AM
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 Enthusiast Joined Feb 8, '04 From KY Currently Offline Reputation: 0 (0%) |
Ok there are only 2 sheilded wires that come off of the ECU.
#1 is the Knock sensor wire, runs straight to the knock sensor and the sheilding is grounded at the ECU. #2 is the O2 sensor wire, it runst straight from the o2 sensor to the ECU and the shielding is also grounded at the ECU. Trace these 2 wires out from the ECU and you will either finde the plug or find out that you don't have a plug for your O2 sensor. |
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Apr 14, 2006 - 11:51 AM
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Enthusiast Joined Mar 3, '04 From Hollywood, MD Currently Offline Reputation: 6 (100%) |
what do you mean by shielded, are they thicker?
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Apr 14, 2006 - 1:11 PM
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Enthusiast Joined Feb 8, '04 From KY Currently Offline Reputation: 0 (0%) |
Sheilded look something like coax cable, it has a core that is insulated by rubber (looks like a normal wire) then around that there is a shielding(bare wires that are wrapped around the insulated core) then there is rubber insulation around that.
I believe one is a thick brown wire with a white core, the other is a clear wire with a white core with copper colored sheilding. These wires have to be grounded at the ecu and the sheilding can not touch the core or you sensors will not work and you will get cel's. |
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Apr 15, 2006 - 1:37 PM
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Enthusiast Joined Mar 3, '04 From Hollywood, MD Currently Offline Reputation: 6 (100%) |
i see two wires coming out of the interior into the engine bay with the rest of the engine harness, i forget the colors right now, i will post them in a second but one is thicker than the other, however neither of these wires actually make it to the alternator with the rest of the wires in that area i guess i iwll have to trace where they are going from the firewall
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