TUCSON(LM) >2012 > G 2.4 DOHC > 4 Wheel Drive (4WD) System > Coupling Assembly > Oil hydraulic Motor(Actuator)>Description and Operation  
Description
The 4WD ECM controls the Pump Motor Pump (Actuator) to generating an oil pressure. The pressure engages a multiple disk clutch to transfer torque to the rear wheels. The torque to the rear wheels varies according to the pressure on the clutch.