Electrical Feed Pump
The electrical feed pump is fitted on the clutch unit and is supplied with voltage from the Differential Electronic Module (DEM). When the engine is started and reaches an engine speed of over 400 RPM the electrical feed pump is supplied with voltage from the control module.
The feed pump pumps oil to the annular pistons, whose rollers move into contact with the hub's cam curve. 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 does not function in the event of a fault in the feed pump.
The feed pump can be diagnosed.