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Thread: V2 RJ11 Connection

  1. #1
    Senior Member
    Join Date
    Apr 2007

    Default V2 RJ11 Connection

    HI, I had this working once, but my cable is MIA. I am attempting to hook up an AEM wideband to V2. I am pretty sure that on the RJ11 plug I hooked up black (pin 2) to ground and Yellow (pin 5) to the blue serial output of the AEM gauge. I tried to make another cable, but keep getting the message "Wideband O2 not found." Any help would be great. Thanks!
    98 WS6, M6, 02 PCM, CO3, SD 2 Bar tune, 416 D1SC Procharger, 73# Injectors, Patriot Lq9 heads, 232 int 240 exh. Lift .595 int .608 exh 115.. header, Intake, AEM WB.

  2. #2
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003


    FSV2 serial comm port pinout:
    Quote Originally Posted by mr.prick View Post
    1 = Tx Data
    2 = Rx Data
    5 = Ground
    You have to wire your wideband serial comm output to FSV2 like this:
    so somewhere in between them this has to be done (this is what the null modem adapter does, crosses Rx and Tx):
    wb.Rx ---> V2.Tx
    wb.Tx <--- V2.Rx

  3. #3
    Junior Member
    Join Date
    Nov 2009


    Am I understanding this correctly for the AEM 30-0300?

    I just wire a RS232 connector, like it shows in the AEM schematic below (for the serial RS232), use a null adapter, and connect that to the serial cable that came with my V2 (the power and ground is assumed to be like the schematic also)?

    Click image for larger version. 

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    If this is correct, can I just swap the wires at the connector on the AEM side, and not use the null adapter?


    Doing my best to fix what ain't broke!!

  4. #4
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003


    Yes on all 3 questions.

    The null modem adapter simply crosses the Rx/Tx signals, so you can do that yourself anywhere.

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