whirring noise when bike is off

[DannoXYZ]

Thank you for this clarification! Any chance you could explain the letter indicators put on all the pins/wires? I confess I haven’t been able to fully decode them. They kinda seem like wire colors, but some don’t make sense - like what color would Gy/R be? It also doesn’t make sense to me why the pin diagram for the ECU connector has one pin labeled R/B but then when examining the lines to there are two labeled R/B - one coming from the EFI fuse, and another going to a fuel injector. How would I know which of these wires actually matches to the pin on the connector?

Location matters. Look at diagram and trace R/B from fuse. Probably R/B starts at fuse and branches off (T-split) to feed two different devices.

Similarly, trace wires on bike to follow what's draw on schematic.