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.
Inspection
All units are filled up with coupling fluid (ultra-low
viscosity ATF) prior to shipping. Inspection, fill-up, and replacement
of coupling fluid is theref ...