Circuit/System Description

The differential clutch pump delivers hydraulic oil pressure to the rear drive clutch solenoid valve and the rear differential clutch solenoid valve. The pump is mounted to the torque transfer device housing. The pressure of the system is calculated by the Rear Differential Clutch Control Module which monitors the differential clutch pump motor current levels. When the calculated pressure reaches approximately 3200 kPa (464 psi), the Rear Differential Clutch Control Module determines that the system pressure has been obtained and deactivates the differential clutch pump. When the calculated pressure drops below approximately 2700 kPa (392 psi), the Rear Differential Clutch Control Module will reactivate the differential clutch pump.