Description of Component/Function Activation

Description of component/function activation

Hint: All components/functions described do not need to be implemented in the Differential Electronic Module (DEM). This varies between different systems and markets.

Component/function

Electric feed pump
The feed pump is activated and builds up a basic pressure in the coupling.
A low humming noise can be heard from the feed pump when it is activated.
Note that the feed pump may sound like it's running but in certain cases it only oscillates.

Control valve
The control valve is controlled by means of the activation of the axial solenoid.
Following activation the solenoid changes the position of the control valve. In this way the pressure to the driven plates' working piston is regulated.

The activation can be made in two stages:
1. Min.
Means a closed control valve which provides maximum pressure on the driven plates, which in turn provides maximum power transmission to the rear axle.
2. Max.
Means an open control valve which provides minimum pressure on the driven plates, which in turn provides a limited power transmission to the rear axle.