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Thread: 20 Valve silvertop wiring o2 sensor

  1. #1
    Junior Member Backyard Mechanic ONCE-NA's Avatar
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    Default 20 Valve silvertop wiring o2 sensor

    Ok ive searched everywhere but cannot find clear and exact instructions on how to hook up an oxy sensor to a Silvertop ecu.
    I have a universal 4 wire sensor with 2 wires for the heating element a ground wire and a sensor output wire.

    And there are 3 o2 sensor related pins on the ecu

    N8 - HT - Heated oxygen sensor
    M6 - OX - Oxygen sensor
    M13 -OXL1 - Oxygen sensor

    So i'm assuming I should wire one side of the heater element to and ignition switched +12VDC
    and is the other side wired to N8 and pulled to ground by the ECU to activate the element?
    and should the ground wire of the o2 be wired to a chassis earth or N9 on the ECU (sensor ground)?
    and as for the sensor output, M6 or M13?
    Or do I have it completely wrong?

  2. #2
    Junior Member Backyard Mechanic ONCE-NA's Avatar
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    Default Re: 20 Valve silvertop wiring o2 sensor

    Anyone??????

  3. #3
    Junior Member Automotive Encyclopaedia
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    Default Re: 20 Valve silvertop wiring o2 sensor

    ht is o2 heater ground
    other heater wire goes to 12v from efi relay will be black/red on std 20v harness

    ox is o2 sensor signal normally black on std 20v loom
    and o2 sensor ground is last wire which is normally brown but i thought
    it normally goes to sensor ground as im not sure on that oxl1 wire

  4. #4
    Administrator Backyard Mechanic
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    Default Re: 20 Valve silvertop wiring o2 sensor

    Doesn't the o2 sensor get earthed through the flange?

  5. #5
    Junior Member Automotive Encyclopaedia
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    Default Re: 20 Valve silvertop wiring o2 sensor

    nope
    earth thru loom

  6. #6
    Its hard being a Backyard Mechanic RT40Corona4AGTE's Avatar
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    Default Re: 20 Valve silvertop wiring o2 sensor

    Quote Originally Posted by dumbass View Post
    ht is o2 heater ground
    other heater wire goes to 12v from efi relay will be black/red on std 20v harness

    ox is o2 sensor signal normally black on std 20v loom
    and o2 sensor ground is last wire which is normally brown but i thought
    it normally goes to sensor ground as im not sure on that oxl1 wire
    This is correct. Also here is a diagram for reference http://sites.google.com/site/chinozie/20v_wiring_a.gif
    1967 RT40 Corona Current Project - http://www.toymods.net/forums/showthread.php?t=46182

  7. #7
    Forum Member 1st year Apprentice
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    Default Re: 20 Valve silvertop wiring o2 sensor

    Did you sort your O2 sensor out and confirm its operation with a wideband?
    GZS55, SA23, AE30, AE70, SE70

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