SsangYong Actyon Sports II. Manual — part 134
07-8
3. SYSTEM LAYOUT
Indicators
▶
4H: 4WD HIGH indicator ON
4L: 4WD LOW indicator ON
2H: Indicator OFF
System failure: 4WD CHECK
warning lamp ON
4WD mode switch
▶
4H: 4 Wheel drive, high speed
4L: 4 Wheel drive, low speed
2H: 2 Wheel drive
TCCU
Solenoid valve
07-9
3240-01
4. IWE LOCKING HUB SYSTEM
1) Overview
The vacuum locking hub uses the IWE (Integrated Wheel End) system, and in this system, the vacuum
is generated only within the hub actuator.
It is structured to transmit power to the front section after the actuator hub is engaged following the
release of vacuum from the drive shaft end gear and the hub end gear
Locking hub actuator
Locking hub actuator
Vacuum
solenoid valve
for IWE
Vacuum
pump
Booster
Electric
signal
To atmosphere
TCCU
Operating Process
Vacuum generation process in front hub actuator
Hub actuator (FR)
Hub actuator (FL)
Vacuum pump
TCCU
to atmosphere
to atmosphere
Vacuum solenoid valve
4WD mode
switch
07-10
2) Vacuum System Related to 4WD
During 2WD mode, the vacuum
pressure from vacuum pump is
continuously transmitted to the
locking hub system.
This vacuum pressure pulls in the
locking hub actuator so that it will
not be engaged with the front end
hub gear.
22WD (applying vacuum pressure to hub
actuator) The vacuum pressure pulls in the
locking hub actuator so that it will not be
engaged with the front end hub gear.
The vacuum pressure is released from the
hub actuator. At this time, the front hub end
gear is engaged.
tmosphere
(in 4WD
mode)
Hub actuator (LH)
Hub actuator (RH)
In 4WD mode, the TCCU blocks the transferring of
vacuum pressure from vacuum pump to locking hub
by supplying the power to solenoid valve.
07-11
3240-01
5. POWER FLOW
Switching 2H, 4H → 4L
Vacuum solenoid
Locking hub operation
(Released internal vacuum)
Front propeller shaft
TCCU
Front axle
Front wheel
Rear propeller shaft
Rear axle
Rear wheel
Transfer case
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