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Message
After I sent this inquiry, I found on the internet that the four
wires should be heater power, heater ground, sensor ground, and sensor output. I
am not certain how to discover which is which with an ohm meter. My
assumption is that the heater wires would ohm closed, and the sensor ground
might also be connected to these two, but probably not.
Hi
Bill,
Since you know it came
off an RX-8, you could try asking on an RX-8 forum. Someone on there would
likely own the wiring diagram, which might give wire colors. Of course
this is assuming they're not all the same color :-)
If you can find a brand
name, or any info on the sensor, you might find it on internet that way as well,
but I would bet you've tried this.
Finally, I would go
along with your assumptions for figuring out which wire is which. I'd
expect to see some resistance between the wires of the heater as you
suggested. I wouldn't be real surprised if both the heater and sensor
ground were tied together at the housing. If so, both will ohm as a short
to the housing. The actual sensor wire should be able to be identified by
heating the sensor with a torch to exhaust temps.
My understanding is that
these sensors will put off 0-1V for various O2 levels, but only when they're at
normal operating temp. Once heated, you could put a voltmeter on the
various wires, and find two that give you a voltage reading. Orient the
meter leads so that you get a positive reading, and the wire that's on the red
lead of the meter will be your sensor wire.
If you want to keep from burning your shop
down, just buy a new single wire sensor. They're cheap :-)
Cheers,
Rusty
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