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Thread: 3 wire O2 sensor, is the middle wire 12V or ground?

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    turbo addict blk86trbo's Avatar
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    3 wire O2 sensor, is the middle wire 12V or ground?

    In the process of wiring a 4 wire sensor to a 3 wire harness...thanks!
    [FONT="Arial Black"]Paul[/FONT] [B][SIZE="1"]US ARMY INFANTRY VETERAN[/B] 1995 Dodge Stealth R/T White DOHC 5 speed 1994 Dodge Stealth R/T Red DOHC 5 speed 1992 Dodge Daytona IROC, Blue TI 5 speed (2) 1992 Dodge Daytona IROC, Red TI auto 1991 Dodge Spirit R/T, Red (project) 1989 Shelby CSX-VNT #382 1989 Dodge Shadow ES, White TI auto 1987 Daytona Shelby Z, White TII 1987 Chrysler T&C wagon, Tan TII auto 1985 Dodge Lancer ES, Bronze TI auto 1982 Wife, White[/SIZE] [SIGPIC][/SIGPIC]

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    turbo addict blk86trbo's Avatar
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    Re: 3 wire O2 sensor, is the middle wire 12V or ground?

    Hey, I figured I would turn the ignition to the "on" position and see which wire was hot, but none of them were. Shouldn't one be, or does the sensor only work when it's running?
    [FONT="Arial Black"]Paul[/FONT] [B][SIZE="1"]US ARMY INFANTRY VETERAN[/B] 1995 Dodge Stealth R/T White DOHC 5 speed 1994 Dodge Stealth R/T Red DOHC 5 speed 1992 Dodge Daytona IROC, Blue TI 5 speed (2) 1992 Dodge Daytona IROC, Red TI auto 1991 Dodge Spirit R/T, Red (project) 1989 Shelby CSX-VNT #382 1989 Dodge Shadow ES, White TI auto 1987 Daytona Shelby Z, White TII 1987 Chrysler T&C wagon, Tan TII auto 1985 Dodge Lancer ES, Bronze TI auto 1982 Wife, White[/SIZE] [SIGPIC][/SIGPIC]

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    turbo addict TopDollar69's Avatar
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    Re: 3 wire O2 sensor, is the middle wire 12V or ground?

    The middle pin (Black) is chassis ground. The Dark Green with Black wire should be switched power from the coil-ASD relay. The Black with Dark Green wire is the O2 signal to the computer.
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    turbo addict blk86trbo's Avatar
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    Re: 3 wire O2 sensor, is the middle wire 12V or ground?

    Quote Originally Posted by TopDollar69 View Post
    The middle pin (Black) is chassis ground. The Dark Green with Black wire should be switched power from the coil-ASD relay. The Black with Dark Green wire is the O2 signal to the computer.
    Thank you very much Sir!
    [FONT="Arial Black"]Paul[/FONT] [B][SIZE="1"]US ARMY INFANTRY VETERAN[/B] 1995 Dodge Stealth R/T White DOHC 5 speed 1994 Dodge Stealth R/T Red DOHC 5 speed 1992 Dodge Daytona IROC, Blue TI 5 speed (2) 1992 Dodge Daytona IROC, Red TI auto 1991 Dodge Spirit R/T, Red (project) 1989 Shelby CSX-VNT #382 1989 Dodge Shadow ES, White TI auto 1987 Daytona Shelby Z, White TII 1987 Chrysler T&C wagon, Tan TII auto 1985 Dodge Lancer ES, Bronze TI auto 1982 Wife, White[/SIZE] [SIGPIC][/SIGPIC]

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