Yes, the changeover takes place at 1500 rpm, then it goes back to default at 5500. The actuators moves to the opposite direction, one is pressing down the chain toward the crankshaft while in the other bank the actuator presses the chain toward the valve cover, this way the intake cams will be advanced by 25 degrees. Check out this video and the descrioption, this will give you an idea how it works:
https://www.youtube.com/watch?v=xmNduI2lRbA&t=10s
If you disconnect the solenoid the CEL should come up and the car should become sluggish.
Boxster
Threaded Mode
