![]() A coil 4 problem should be the most obvious when Lane A is turned off while Lane B is running the engine. Coil 4 is controlled by Lane B, and fires the top plugs on Cylinders 3 & 4. The "Coil 4" message is pretty specific, and as was suggested by another member in your last topic, you can start with the basics of checking the connections at Coil 4 and the spark plugs and wires associated with it. All that said, I believe this tool is a must for 912iS owner who will do their own maintenance. You get a dongle and a cable, then download the software. ![]() Also, there is no documentation that comes with the BUDS system that explains the error codes. You will get more diagnostic information than is presented on your Dynon, but there is a learning curve for both setup and effective use. If you don't already know this, the BUDS (BRM Utility & Diagnostic Software) consists of a physical dongle and and software package that will cost you about $1K for the Level 2 system. As far as the BUDS diagnostic tool, that connects to the ECU directly through the Rotax CAN bus so Dynon has nothing to do with it. ![]() Those codes don't seem to be documented anywhere, and instead are passed along like Tribal Knowledge, with some of this information being presented through the Rotax classes. I would not expect that Rotax faults would be well explained by Dynon.
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