I don't have experience on the ICV used on the 190 engine, only the ones uses on the 420's and 560's. These ICV's are nothing more than a solenoid operated valve. I don't even think it is a modulating type valve. In other words, it is either completely on or completely off. The valve that you're describing sounds a bit more complex than this. Hopefully, someone in this group will have experience with it and can explain the procedure for setting the knob adjustment.

T.C.