Lane A light on - Solid

We have just had a similar problem, the LANE A light would come on but initially we could toggle the Lane A switch and clear the fault, however, the interval between these failures got worse and then it wouldn't clear. There were no real engine rpm drop on performance. We use the aircraft as a Glider / Sailplane Tow plane. We spent most of today investigating the fault. The Downloaded data showed an "Ignition (Cyl 1 and 2) Driver Test Open Secondary Detected". We concentrated on Cyl 1 and 2. We pulled off the Spark Plug Caps and using a Multimeter measured the resistance between Cyl 1T and Cyl 1B it read  18k ohm (Ignition Module 8k + two plug caps of 5k each), however, Cyl 1B and Cyl 1T was Open Circuit. It was a case of eliminating the Ignition Coil module, leads and Plug Caps. In our case it turned out to be a plug cap, with an O/C resistor. We dissected the plug cap to see if the resistor had burned out of just suffered some vibration damage, it was inconclusive although there were slight burn marks on the resistor. I hope this helps others with a similar problem, because Rotax and their Agents don't seem very helpful with the 912iS Engine faults.

Malc

912iS

We have the exact same problem. In flight lane A lights up. After a reset, lane A seems to work again for a few minutes. However, after a few minutes the problem comes back. The error log states "Ignition/injection driver communication error". Where to start debugging this issue?

Thanks,