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Thread: FJO GENIII wideband controller

  1. #1
    Lifetime Member 67SS509's Avatar
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    Default FJO GENIII wideband controller

    Needed a second wideband controller so I bought a GenIII FJO. I have been using a GenII FJO with serial connection for several years and I have been well pleased with it. Got it today and started looking it over. It does not have the serial style cable but a device that converts to a USB plug. How do I take this to the V2? Also looks like it powers up thru the USB. Does that sound possible? Settings in the V2 does show a selection for the GenIII. Anybody got one of these working?

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    Last edited by 67SS509; May 19th, 2013 at 03:22 AM. Reason: added diagrams
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  2. #2
    Joe (Moderator) joecar's Avatar
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    You really do need the serial comms connection...

    and a separate power/ground connection.

  3. #3
    Joe (Moderator) joecar's Avatar
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    Do you have any wiring diagram of its interface (or can you reverse engineer the USB interface, it probably is some serial-to-USB converter)...?

  4. #4
    Lifetime Member 67SS509's Avatar
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    Thanks for taking a look at this Joecar. FJO don't even mention the interface being supplied with the wideband. Looking at the wiring diagram the white/red wire is the only wire that moves data when connected to the PC. To be "serial" that will work with the V2 doesn't it need to be 2 data wires and ground?
    Being that FJO has sold out to Holley I don't believe I'm going to get much help from them on this.
    2002 Chevy truck, SCSB 2WD, Stroked LS3 w/Big Mutha Thumper cam
    2002SS Camaro LS7/427 with stock suspension setup
    2012 Chevy truck, SCSB 2WD, Magnaflow exhaust + K&N

  5. #5
    Joe (Moderator) joecar's Avatar
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    2-wires+ground: bi-directional serial comms.

    1-wire+ground: single direction serial comms <-- this is sufficient.

  6. #6
    Lifetime Member 67SS509's Avatar
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    Quote Originally Posted by joecar View Post
    2-wires+ground: bi-directional serial comms.

    1-wire+ground: single direction serial comms <-- this is sufficient.
    But which one is the V2 going to want?
    2002 Chevy truck, SCSB 2WD, Stroked LS3 w/Big Mutha Thumper cam
    2002SS Camaro LS7/427 with stock suspension setup
    2012 Chevy truck, SCSB 2WD, Magnaflow exhaust + K&N

  7. #7
    Joe (Moderator) joecar's Avatar
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    For example:
    - AEM UEGO only has a single wire (transmit) from which V2 reads lambda;
    - LC-1 has two wires (transmit/receive) from which the V2 reads lambda (transmit) and writes commands (receive).

    It all depends on the wideband.

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