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Re: O2 Sensor Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Wed, 8 Jan 2003 10:09:32
In Reply to: O2 Sensor, Yaofeng, Wed, 8 Jan 2003 08:54:33 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The two wires of the same color are the heater, and there is no polarity - either way will do. The wire of a different color (usually white) is the signal wire. So look at the wires in the harness - the two of the same color in the harness go to the two of the same color on the sensor. You can't hook them up backwards.
The best way is to solder the wires, and I like to use a piece of heat-shrink tubing over each wire. Soldering isn't absolutely necessary, but it does help.Remember, solder is an electrical connection, not a mechanical one, so make sure the bare wires are twised together well.
My preference is to use a small diameter piece of heat shrink tubing over each individual wire, and cover the whole mess with one larger piece. Of course, it takes planning, because you need to put the tubing over the wires BEFORE you connect them. I also like to stagger the connections along the length of the wire - no two connections lie on top of each other. Partly to even further reduce the possiblity of a short circuit, but mostly to avoid a big bulge in the wire. Heat shrink tubing is available at places like Radio Shack. Electrical tape also works fine. I also like to make the connections as far from the sensor as possible, mostly to keep the splice away from the heat of the exhaust.
Some folks worry about wire lengths, and the need for soldering. Wire length really isn't critical. The sensor signal is very high impedance - namely, it looks like a big resistance already. An extra few tenths of an ohm from an extra foot of wire isn't going to make a difference out of 100,000 or more ohms of the sensor. The same with soldering. The major advantage of soldering is that it will seal air out of the connection, reducing the chance of corrosion making for a bad connection later.
When it comes the the heater circuit, that carries a relatively large current, so a good connection becomes more important. But again, a foot extra of wire is such a minimal increase in resistance that it's not worth worrying about, and if making the wire a little longer makes for easier access or some extra wire for the 'oops' factor, it's well worth it. Again, soldering is nice, but making a good twisted connection is most important, and wrapping it with something to keep water out.
posted by 192.249....
, Wed, 8 Jan 2003 10:09:32 <-- Viewing This Message
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