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5th O2 sensor wire?

Iggy

Well-known member
Joined
May 7, 2015
Messages
50
Location
Ashland. Wi
Today went to replace my O2 sensor and was surprised to find a 5th wife in the loom before the 02 connector. I can't find the other half of it, but I'm guessing to goes some where? doesn't help that the insulation is gone.
 

G

Staff member
Joined
Feb 24, 2004
Messages
8,896
Location
zompton
That's a ground.
 

Iggy

Well-known member
Joined
May 7, 2015
Messages
50
Location
Ashland. Wi
A ground for what?
 

G

Staff member
Joined
Feb 24, 2004
Messages
8,896
Location
zompton
Or shielding, I forgot.
 

mjdarg

Active member
Joined
Oct 21, 2013
Messages
36
Location
Raleigh, NC
Yea, that looks like shielded that is in the harness under the heat shrink.
 

iceman69510

Turn Right Racing
Staff member
Joined
Mar 5, 2001
Messages
10,964
Location
Michigan
Agreed, that is the shielding wire.
 

FlyingEagle

Staff member
Joined
Mar 5, 2005
Messages
1,635
Location
THE Ottawa
See the diagram in the site thread below.

Click for GVR4 thread

It's a big fanout sheet for 4g63 type wiring. Pins with the little circles drawn around the wires, for the 02 sensor and the knock sensor are a shared shield setup; open an unattached at one end, connected at the other, but not part of a circuit - just noise/RF rejection, likely only could be causing by radios/plugs/etc.

I just build a little harness to replace my current one should anything in it go bad, and I had my hands on those wires first hand. The other guys before me, nailed it!
 
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