I agree, not normal and probably the secondary butterfly-valve stepper motor which does that prep-to-start jig.I think it would be a stepper motor on the butterflies, but could be wrong of course. Maybe a limit switch or sensor needs adjusting or has gone bad.
I know that for the Gen1 Wee the only need for the SDS was to lock out the ISC (idle speed control) valve at mid-range to prevent it from interfering with the adjustment of the idle-air screws (i.e. TB sync) when balancing the cyclinder vacuum at idle. There was also a procedure to reset the ISC settings. So this could be done without an SDS.Kinda hard to monitor the STV's without the Suzuki SDS software. You could see if a dealer around can see any strange things.
An expensive potentiometer.It's just a potentiometer. Either a 5k or 10k.
Hope it does the trick!