OEM Bosch Idle valve question

[zaq123]

Which type do you think it falls under:

Uni-Directional - Both outputs will have the same duty. i.e. When the Main is 25% the Slave is 25%.
Complementary - When one output wire is increasing duty the other will be inverted and decreasing duty. i.e. When the Main is 25% the Slave is 75%.
Bi Directional - One solenoid controls 0-50% of the valve opening, the other controls 50% to 100% of the valve opening. The solenoid itself defaults to 50% open when no connection at all is present.

[zaq123]

any guesses? I tend to believe it's more of a complementary but wanted to see if anyone knows for sure

[varg]

Who has a stock E30 and an oscilloscope? Not I. The circuit used to control these in MS has one processor output going to two transistors which are outputting inverted signals of each other due to their input circuitry, that would make it option B.