FRONT AXLE (4X4) 45 FRONT AXLE (4X4) FRONT AXLE DISCONNECT (FAD) Front axle disconnect is used to engage and disengage the front axle of the vehicle with the transfer case. FAD has a motor to the do the actuation operation. The transfer case ECU controls the Front Axle Disconnect actuator. Transfer case ECU generates a signal to engage and disengage the FAD actuator. The 4H or 4L indicator (Depending o the transfer case selector switch position) will blink for few seconds and will remain illuminated after successful shifting to the desired mode. CONNECTOR DETAILS (W/H connector view from pin insertion side) PIN DETAILS PIN DESCRIPTION A Front Axle Disconnect Actuator Signal B Ground C Empty D Power Supply ! CAUTION Never apply any voltages to FAD using an external power supply. WORKING The collar rides on the outboard shaft when it is not in use. During use the collar is positioned so that both shafts share engagement with the collar. While shifting the vehicle to four wheel drive system the transfer case is first engaged which in turn, spins the front propeller shaft. The propeller shaft spins the pinion gear which turns the ring gear. The ring gear turns the differential case which spins the intermediate axle shaft. The clutch collar through use of an electric motor is pushed by a fork inboard. Once the intermediate shaft and the outboard shaft splines aligns the clutch collar will then engage the intermediate shaft and torque is then transmitted out to the wheel-end. The clutch collar is held engaged / disengaged by the electric motor. The system will engage / disengaged the clutch collar only when there is no torque being transmitted through the axle shafts via the propeller shaft. NOTE It is not recommended to shift from two-wheel drive to 4WD with the rear wheels slipping, because this may damage the drive train components.
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