Stepper Motor
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2009 Volvo S60, 2008 Volvo S60, 2007 Volvo S60, 2006 Volvo S60, and 2005 Volvo S60. However, it is still accessible from the selected car via links, so may be relevant.
The stepper motor (4) is built into the housing for the differential electronic module.
The differential electronic module supplies the stepper motor with power. A control signal to the stepper motor from the differential electronic module changes the position of a control spindle (3) in the control valve (2) via a small gear wheel (5). The position of the control spindle alters the cross section of a return duct (1) in the valve. This controls the pressure to the operating piston for the multi-plate clutch.