Control Valve/Axial Solenoid
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
The control valve/axial solenoid are in the coupling unit for the active on demand coupling (AOC).
The axial solenoid receives a constant pulse width modulated (PWM) signal from the control module. The control signal from the control module is used by the solenoid to change the position of the control valve. This regulates the pressure to the operating piston in the multi-plate clutch.
Four wheel drive is disabled if there is a fault in the control valve/axial solenoid.
There are diagnostics for the control valve/axial solenoid.