These drawings were freely available at Hamm this year and so I grabbed them to help anyone thinking of a project along these lines. They relate to and are used with software that only runs some of the first European Smart bikes. We can't get the software though
http://www.dieselbike.net/manuals/SMART ... RT_ECU.zip
Grab a copy while you can
SMART Schematics at Hamm 2014
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