HEXA

FRONT AXLE (4X4)

IV 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 TOD ECU controls the Front Axle Disconnect

actuator. TOD ECU generates a signal to engage

and disengage the FAD actuator, it gets a

feedback signal from the Front Axle disconnect

actuator to signify if FAD actuator is engaged or

disengaged. Facia switch light will glow in 4x2

mode and it will be switched off in Auto mode.

Facia switch light will be blinking while the shift is

in progress.

CONNECTOR DETAILS

PIN DETAILS

PIN DESCRIPTION

Front Axle Disconnect Actuator Signal

Ground

Front Axle Disconnect Feedback Signal

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.

When the four wheel drive system is engaged the

transfer case

(TOD)

is first engaged which in turns

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 align 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 Auto mode with the rear wheels slipping,

because this may damage the drive train

components

DISMANTLING

1. Take the removed disconnect cover assembly

from disconnect housing, clean the oil with the

help of cotton waste.

2. Remove the electrical motor from disconnect

cover assembly by removing bolts connecting

motor to disconnect cover assembly.