O2 sensor wiring
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Elder User
Joined: Feb 2004
Posts: 830
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From: Indiana
O2 sensor wiring
Does anyone have a manual that shows the wiring for a three wire O2 sensor?
The O2 sensor has 2 white wires and a black wire, the other side of the connection has black wire a gray with yelow stripe and a green withe a purple stripe.
I need to know whick wire is the feed back and which ones are for the heated portion of it.
The O2 sensor has 2 white wires and a black wire, the other side of the connection has black wire a gray with yelow stripe and a green withe a purple stripe.
I need to know whick wire is the feed back and which ones are for the heated portion of it.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
I don't have a wiring diagram with me, but if you have a multimeter you can figure them out. On the sensor, the white wires are the heater circuit (polarity doesn't matter) and the black wire is the signal wire. On the truck side of the harness, test black for continuity to ground, then test the other two for voltage. The one that has 12V is the heater supply voltage, leaving the third to be the signal wire. I'm thinking that the green/purple wire is the signal wire, but it's been a while since I looked, so that might not be the case.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Chassis side:
Dark green with purple stripe is the signal wire.
Grey with yellow stripe is power. (test with DMM)
Black is ground.(test with DMM)
Sensor side:
Black is signal
Whites are power and ground. Test with a DMM to see if one wire is shorted with the metal body of the sensor, if it is then that is ground but if not it doesn't matter which one you make power or ground.
Dark green with purple stripe is the signal wire.
Grey with yellow stripe is power. (test with DMM)
Black is ground.(test with DMM)
Sensor side:
Black is signal
Whites are power and ground. Test with a DMM to see if one wire is shorted with the metal body of the sensor, if it is then that is ground but if not it doesn't matter which one you make power or ground.
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