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Thread: AEM X-Series Wideband - Serial

  1. #1
    Lifetime Member Gregs's Avatar
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    Default AEM X-Series Wideband - Serial

    Hi all,

    I'm getting started back up after a few years out of the game. I got a new AEM x-series wideband installed last week. I used to tune with an LC-1 but it died a few years ago. The new wideband is working but I can't get the V2 to see the sensor. I believe I have it wired correctly, I have verified that my ground and signal output go to pins 5&1 respectively on the Flashscan V2 RJ-11. The V2's 2nd light (serial coms) doesn't light up. I figured out how to cycle through different wideband options on the V2 by pushing the backspace button. The wideband doesn't show up on any of them. I've been out of the game too long, is there something else I have to do to the V2?

    I wanted to start a new thread because the other one is focused on CAN communications. Working on an LS1B controller here. I feel old since everyone is playing with the new stuff now

    *Full disclosure*
    I originally bought the 30-0333 kit but should have bought the 30-0300. I depinned AEM's 3&4 pin and reused one of the pins for my serial out (pin 5). I'm pretty certain I didn't mess that up... but you never know...

    Click image for larger version. 

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    Last edited by Gregs; February 11th, 2017 at 08:54 AM. Reason: Forgot to attach graphic

    03 Silverado 5.3 ECSB 4x4 Z71
    Comp Cam 206/212 .515/.522 112 lSA, hardened rods with LS9 springs

    2010 Tahoe VVT AFM 5.3
    Stock for now

  2. #2
    Joe (Moderator) joecar's Avatar
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    Which signal are you using (Tx or Rx)...?

    ~Moderator~

  3. #3
    Junior Member spedracr93's Avatar
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    Quote Originally Posted by Gregs View Post

    I have verified that my ground and signal output go to pins 5&1 respectively on the Flashscan V2 RJ-11.

    Click image for larger version. 

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    I'm having a similar issue with the exact same sensor. I bought this with the desire to record serial data only to be disappointed when I opened the box and found that there weren't any wires for outputs beyond the CAN. I bought some contacts and 26 ga. wire and installed a wire at Pin 5 of the UEGO plug for serial output. I connected that wire to Pin 5 of a 6P6C connector while Pin 2 of the UEGO connected to both Pin 2 of the 6P6C and directly to a chassis ground.

    Like you, my sensor is working fine on the display but I cannot get the V2 to read the signal.

    I noticed you said you were hooked to 5 & 1 on the V2, but I have read it should be 5 & 2. I wonder if that's not your issue. I still don't know what my issue is...

    Here's a crude representation of how mine is wired...
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. #4
    Lifetime Member Gregs's Avatar
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    Quote Originally Posted by joecar View Post
    Which signal are you using (Tx or Rx)...?

    ~Moderator~
    AEM Pin #5 (Serial/RS-232 Output) to Flashscan V2 pin #1 (RX)

    03 Silverado 5.3 ECSB 4x4 Z71
    Comp Cam 206/212 .515/.522 112 lSA, hardened rods with LS9 springs

    2010 Tahoe VVT AFM 5.3
    Stock for now

  5. #5
    Lifetime Member Gregs's Avatar
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    Quote Originally Posted by spedracr93 View Post
    I'm having a similar issue with the exact same sensor. I bought this with the desire to record serial data only to be disappointed when I opened the box and found that there weren't any wires for outputs beyond the CAN. I bought some contacts and 26 ga. wire and installed a wire at Pin 5 of the UEGO plug for serial output. I connected that wire to Pin 5 of a 6P6C connector while Pin 2 of the UEGO connected to both Pin 2 of the 6P6C and directly to a chassis ground.

    Like you, my sensor is working fine on the display but I cannot get the V2 to read the signal.

    I noticed you said you were hooked to 5 & 1 on the V2, but I have read it should be 5 & 2. I wonder if that's not your issue. I still don't know what my issue is...

    Here's a crude representation of how mine is wired...
    Nice diagram! I'm at work and my connector is at home but I think my ground was white on the connector going into the V2. See attached graphic I stole from the forum, I took that diagram as looking into the V2, so you would have to make sure you weren't looking at the connector backwards, might want to double check that? See my reply to Joecar, I have my AEM output going to V2 RX (pin #1). Maybe I'm thinking of this backwards?

    Click image for larger version. 

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    Last edited by Gregs; February 13th, 2017 at 04:47 AM. Reason: spelling correction

    03 Silverado 5.3 ECSB 4x4 Z71
    Comp Cam 206/212 .515/.522 112 lSA, hardened rods with LS9 springs

    2010 Tahoe VVT AFM 5.3
    Stock for now

  6. #6
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Gregs View Post
    AEM Pin #5 (Serial/RS-232 Output) to Flashscan V2 pin #1 (RX)

    Look at this:

    serial-port-cable-that-goes-to-v2~post#15

    Quote Originally Posted by joecar View Post
    Summarizing from mr.prick's link (that's a very good link, thanks):

    There are two types of serial equipment:
    - DTE (data terminal equipment) e.g. computers, printers.
    - DCE (data communications equipment) e.g. modems, wideband, FlashScanV2.

    DCE devices can connect directly to DTE devices without Tx/Rx crossover.

    Tx is the device's serial output (on which it sends out serial data).
    Rx is the device's serial input (on which it receives in serial data).

    Wideband and V2 are both DCE (transmit = Rx, receive = Tx)...
    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

    (see post #19 below)

    See the attached diagram (I added some labels).

    Try connecting to V2's Tx pin.

  7. #7
    Lifetime Member Gregs's Avatar
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    Quote Originally Posted by joecar View Post
    Look at this:

    serial-port-cable-that-goes-to-v2~post#15




    Try connecting to V2's Tx pin.
    Thanks, I'll try this tonight

    03 Silverado 5.3 ECSB 4x4 Z71
    Comp Cam 206/212 .515/.522 112 lSA, hardened rods with LS9 springs

    2010 Tahoe VVT AFM 5.3
    Stock for now

  8. #8
    Lifetime Member Gregs's Avatar
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    No luck, I switched AEM output to V2 pin 2 (tx). V2 still doesn't read the wideband.

    03 Silverado 5.3 ECSB 4x4 Z71
    Comp Cam 206/212 .515/.522 112 lSA, hardened rods with LS9 springs

    2010 Tahoe VVT AFM 5.3
    Stock for now

  9. #9
    Lifetime Member Tre-Cool's Avatar
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    Yeah i purchased a bunch of new units and had Dr Mike change the firmware to support a faster transmit speed and give me can support for efilive & all 3 of the guages wont work for serial. so I'm thinking something is broken on that firmware for that model.

    I can swap in another guage and serial comms works, so i know it's not the cable.

  10. #10
    Junior Member spedracr93's Avatar
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    Quote Originally Posted by Gregs View Post
    Nice diagram! I'm at work and my connector is at home but I think my ground was white on the connector going into the V2. See attached graphic I stole from the forum, I took that diagram as looking into the V2, so you would have to make sure you weren't looking at the connector backwards, might want to double check that? See my reply to Joecar, I have my AEM output going to V2 RX (pin #1). Maybe I'm thinking of this backwards?

    Click image for larger version. 

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    Yea, I'm not sure. I wired it up from this: https://forum.efilive.com/showthread...ging-afr/page2

    OP said he had success going to 2 and 5, and then the last post from joecar more clearly states what should be the pinout.


    Is there a way to verify serial output other than through the V2. I can read a voltage output on the signal wire, but obviously that doesn't correlate to the transmission like the analog output does. It varied from 0.48 to 0.51 V changing similarly to the rate of the AFR output on the gauge.

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