Coupling Unit And Control Module

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.

Fig 1: Coupling Unit And Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

The hydraulic section consists of 1-5, the mechanical section consists of 6-10 and the electronic section consists of 11-13.

Pressure valves
Accumulator
Oil filter
Annular pistons
Control valve/axial solenoid
Input shaft
Inner and outer wet multi-plate clutch
Inner connection hub with sinusoidal cam disc
Rollers with annular pistons
Output shaft
Electrical feed pump
Differential electronic module (DEM)
Oil pressure and temperature sensor.

The differential electronic module (DEM) is integrated in the coupling unit.

The differential electronic module (DEM) communicates with other control modules using controller area network (CAN) communication.

There are internal diagnostics for the control module.