V70 2.4 L5-2.4L VIN 61 B5244S (2001)
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.
Electrical feed pump
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
