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    Ground offsets like that are why you MUST have...

    Ground offsets like that are why you MUST have either:

    a. OBDII/CAN interface
    b. Serial data interface or
    c. Analog interface WITH GROUND OFFSET COMPENSATION.
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    I actually have a patch for the 30-0334 and...

    I actually have a patch for the 30-0334 and 30-0310 that ups the serial data-rate and adds an extra digit of resolution.
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    Yes. But, it's not QUITE that simple. The...

    Yes. But, it's not QUITE that simple. The 30-0310 has to have its settings hard-coded, since there is no display to show the changes. That's why AEM does not sell OBDII versions of the 30-0310.

    ...
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    The inline x-series units can be re-flashed to...

    The inline x-series units can be re-flashed to work with the OBDII interface like the gauges.
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    Well.... 5 is the serial data line. But, 3 is...

    Well.... 5 is the serial data line. But, 3 is the CANL line. So, not a good choice for the ground wire. I would just tie into the main ground on pin 2 ( or chassis ground ).

    According to the...
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    How do you have it hooked up ?

    How do you have it hooked up ?
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    Possible solution.

    I just finished a new firmware mod for the 30-0334 that makes the serial data line usable. It increases the polling interval to 20ms and, adds an extra full digit of resolution. If you want to...
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    OK. For anyone who wants to try it, I just...

    OK. For anyone who wants to try it, I just completed a serial data mod re-flash for the AEM 30-0334.

    It increases the polling interval to 20ms ( 50x per second. Or 5x faster than "stock" ) and...
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    I believe the plan, going forward, is to have...

    I believe the plan, going forward, is to have support for the 30-0300 ( and other ) CAN data channels work through the prolink. This is, by far, the best way to get wideband data into the scanner. ...
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    Yeah. It seems like the serial output shares the...

    Yeah. It seems like the serial output shares the same scaling factor as the display . So, when you switch the display to Lambda, the serial data switches from 14.7 to 10.0 it should be 1.00 ( if...
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    If you can use the analog output, instead; it is...

    If you can use the analog output, instead; it is greatly superior to the slow/coarse serial output. The serial output is only 10 samples/second and only 3-digits accuracy. It also has a strange bug...
  12. Thread: Aem 30-0334

    by dr.mike
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    391

    The only measurement it knows how to make is the...

    The only measurement it knows how to make is the percentage of oxygen at the sensor tip. AFR and lambda are just calculated from that number by a formula. In reality, the o2% can be negative, when...
  13. Thread: Aem 30-0334

    by dr.mike
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    391

    A lot like you described. 0.0% would be...

    A lot like you described. 0.0% would be everything richer than 14.7afr ( lambda 1.0 , or, zero free oxygen )
    0.05 to 2.5% would be on the lean side, usually with 2.5% ish only happening on decel....
  14. Thread: Aem 30-0334

    by dr.mike
    Replies
    8
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    391

    Something is off, there. Can you maybe post a...

    Something is off, there. Can you maybe post a video of the issue ? rCal should be fine for almost all conditions.

    To test it,

    1. Set the gauge to rCal
    2. Set the gauge to display o2%
    3....
  15. Thread: Aem 30-0334

    by dr.mike
    Replies
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    391

    Free-air cal will not help this one. You do...

    Free-air cal will not help this one. You do need to run the analog negative to the ground on the MPVI2 so the the gauge and the scanner will agree on what ground level is.
  16. One last thing, the digital OBDII interface is...

    One last thing, the digital OBDII interface is MUCH more accurate than the uncompensated analog output of the Innovate gauge.
  17. Yes. That is the re-flash. It converts an AEMNet...

    Yes. That is the re-flash. It converts an AEMNet X-series device to an OBDII device. But, you have to come up with your own wiring. i.e. you have to come up with your own pass-thru adapter or,...
  18. 0-5v analog signals can't be placed on the OBDII...

    0-5v analog signals can't be placed on the OBDII connector. You would have to create a version of the AEM 30-0334 circuit that converts ARF data to digital OBDII data.

    I have flashed several of...
  19. Thread: Wideband Usage

    by dr.mike
    Replies
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    If the sensor is in the exhaust, it MUST be...

    If the sensor is in the exhaust, it MUST be running with the controller/heater. The sensor needs to be hotter than the exhaust gas to keep deposits from settling on it, and, fouling the element. ...
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    Yes, the 30-4110 uses the 4.9 sensor, now. But,...

    Yes, the 30-4110 uses the 4.9 sensor, now. But, it is a bit of a kludge. i.e. It's the old 30-4100, tweaked to use a different sensor type. But, the change, really, requires different circuitry...
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    The AEM 30-4110 is kinda a dead technology. And,...

    The AEM 30-4110 is kinda a dead technology. And, was designed for the old LSU4.2 sensors. Better to get the current 30-0300, if the price is even close.
  22. page 7 of the 30-0306 instructions manual gives...

    page 7 of the 30-0306 instructions manual gives the specifics for the 0-5v output.

    https://www.aemelectronics.com/files/instructions/30-0306.pdf

    0-5V Analog Output Scaling Formulas
    psia =...
  23. Did you remember to ground the brown wire ?

    Did you remember to ground the brown wire ?
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    You need to connect the brown wire from the gauge...

    You need to connect the brown wire from the gauge to the ground pin on the MPVI for the analog signal to work properly. That is the ground reference line.
  25. Thread: O2 wideband

    by dr.mike
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    This method does not work, yet. The CAN...

    This method does not work, yet. The CAN connection of the AEM 30-0334 is through the OBDII connector. And, that woks with pretty much all CAN based ECUs. The CAN wires on the prolink are a...
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