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FRONT AXLE (4X4)
45
FRONT AXLE
(4X4)
FRONT AXLE DISCONNECT
(FAD)
Front axle disconnect is used to engage and disen-
gage the front axle of the vehicle with the transfer
case. FAD has a motor to the do the actuation op-
eration.
The transfer case ECU controls the Front Axle Dis-
connect 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 sec-
onds 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 intermedi-
ate 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 interme-
diate shaft and torque is then transmitted out to the
wheel-end. The clutch collar is held engaged / dis-
engaged by the electric motor.
The system will engage / disengaged the clutch col-
lar 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.