S60 L5-2.4L VIN 64 B5244S6 (2003)
The electrical feed pump is integrated in the coupling unit and is powered by the Differential Electronic Module (DEM). When the engine is started
and exceeds 400 rpm, the electrical feed pump receives power from the control unit.
The feed pump pumps oil to the annular pistons, whose rollers move into contact with the cam disc. At the same time the oil flows to the operating
piston, so that the play in the multi-plate clutch unit is eliminated. The coupling is then able to react rapidly and regulate as required.
Four wheel drive is disengaged if there is a fault in the feed pump.
There are diagnostics for the feed pump.
Function
Electronic function
1. Oil pressure and temperature sensor
2. Differential Electronic Module (DEM)
3. Control valve/axial solenoid
4. Electrical feed pump.
The Differential Electronic Module (DEM) is secured directly to the coupling unit and forms a single unit with the axial solenoid and control valve.
The Differential Electronic Module (DEM) receives signals from the Engine Control Module (ECU) and the Brake Control Module (BCM) via the
Control Area Network (CAN). The Differential Electronic Module (DEM) uses the sensor signals to control the oil pressure to the multi-plate clutch
by adjusting the axial solenoid. The axial solenoid regulates the control valve constantly using a Pulse Width Modulation (PWM) signal. The oil
