Lane A and B flashing after startup

You have lost all the data that originates in the ECU.

The CAN-Bus connectors would be my first choice.

The first "Easy" thing to look for would be a loose connector or a chaffed wire.

Hi Bill, thanks for your input. Back at the hangar I will check the connectors and cables.

I am still at the bottom of a long and steep learning curve here ....

Immediately after the error occurs, I see that the amps (still visible through Dynons EMS) drop off (first picture). And after both lanes are switched off, the data come back on again (second picture). Are these findings in accordance with your suggestion? Or does this hint at something more serious?

In Second-guessing myself, it could be something as simple as the voltage is dropping below 9 volts during the start and the ECUs are faulting out.

When the lanes fault, the ECU will take all the generator power for itself and the battery will go into a discharge.

If the Lanes reset after the engine start and does not re-fault, this is a possibility.

Access to a dongle is a requirement for all owners of these engines.

If your mechanic does not own one, you should!

The inspection of the logs is a checkbox item on the Annual/100hr inspections.

If the logs were not downloaded, the inspection was not completed.

By all means, examine the ECU log file and see why the lanes faulted.

Hi Bill,

Thanks for your thoughts and suggestions. I will order a dongle and post the outcome hopefully by the end of next week. 

It took me a bit to get the ECU log files. Bought the dongle. Installed the software on an old laptop. But then the connection with the maintenance port and the ECU didn't work. Whatever I tried.

I thankfully could borrow a engine simulator and hooked that up with the HIC and a few other connectors. That worked.

Is there anybody (Bill?) on the forum who can and is willing to open, read and interpret these logs? Would be very much appreciated to get some opinions. 

In the next few days I will also run the engine through the simulator, hooked up with the dongle and diagnostic software to see if there are any errors popping up on the Rotax side.