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I'm trying to figure out why I'm not getting any CAN data from the 912iS ECU to the Dynon EMS-221.

I know the EMS-221 is functioning and communicating, as the HDX shows battery voltage and fuel pressure.

But I can only assume, since the Start Power and Backup Power switches will each run the fuel pumps, and pressing the start button will engage the starter motor, that the ECU is awake.

Is this true? Is this a valid verification of EMS status?

There are no blinky lights, fans, etc, just a black box. And with no CAN data, how do I know?

Dynon support has said that to verify the ECU is awake, I need to start the engine. This is a new factory-pickled engine, and I don't feel comfortable running it blind with no Oil Pressure data, which comes via CAN.

  • Re: How to verify ECU is awake?

    by » 2 years ago


    I'm pretty sure I've confirmed that my ECU is not powering up. Full system load with either Start or Backup power switches on is only 0.35A, which is likely just the fuse box. If the ECU was on, draw should be closer to 1.5A.

    Going to start a new thread to troubleshoot the ECU power.


  • Re: How to verify ECU is awake?

    by » 2 years ago


    Pull Off the X3 connector (the one on the Right with 3 heavy pins in it) from The Fuse Box.

    Measure The voltage from Pin #3 (The horizontal one on the bottom) to the wire studs on the Ground plate under the "B" Regulator (The one on the Right with the Grey Generator Connector) for ~12volts.

    Then measure from Pin#3 to the studs on the Ground plate under the "A" regulator for the same ~12 volts.
    If you have voltage on B but not A, you have START POWER but you forgot to connect The A and B Grounds together when applying START POWER.

    When all is correct, look in the clear cover of the Fuse Box.
    There will be a row of 2 dozen small LEDs next to the Row of Fuses, All illuminated if the ECU is powered up.
    They are not very bright and only visible under heavy shade.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.


    Thank you said by: Jason Fish

  • Re: How to verify ECU is awake?

    by » 2 years ago


    I started a new thread about this, assuming that my low amp draw was proof that the ECU is not powering up. But you're saying that my row of lit fuse LEDs indicates that the ECU is powered on? Now I don't know what to think.

    Please visit the other thread, see if there's anything we missed, or something not right.

     


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