2013 SSANGYONG NEW ACTYON SPORTS power steering

11-20
5) ARP (Active Roll-Over Protection
The ARP (Active Roll-over Protection) system is a safety assistant device that minimizes, by controlling
brakes and the engine, the physical tendency of the vehicle rollover during sharp lane changes or U-
turns. For the system, software is added to the existing ESP system and no additional device or switch is
needed. One must note that the ARP system, just as general assistant devices including the ABS, is only
a safety assistant device using the ESP system and its function is useless when the situation overcomes
the physical power. Following picture shows how the ARP compensates the vehicle position by varying
each wheel's braking power to overcome the physical tendency of the vehicle rollover during sharp turns.
Lateral sensor
(In sensor cluster)
Vehicle speedBrake force
Radius
The vehicle driving condition is controlled by the internally programmed logic according to the input
signals from wheel speed sensor, steering angle sensor and lateral sensor.
During the ARP operation, vehicle safety (rollover prevention) takes the first priority and thus, stronger
engine control is in effect. Consequently, the vehicle speed decreases rapidly, so the driver must take
caution for the vehicle may drift away from the lane.

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1. SPECIFICATIONS
Description Specification
Steering wheel Type 4-spoke type
Gear box
(HPS)Type Rack and pinion type
Gear ratio 40.245
Steering angle Inner36.2˚
Outer32.4˚
Oil pump
(HPS)Type Vane type
Maximum pressure (kgf/cm2)90 ± 3
Pulley size (mm)Ø115
Operating temperature-40℃~150℃
Minimum turning radius (m) 5.8
Steering oil Type S-PSF-3
Capacity (L) Approx. 1.0
Service interval Daily check and add if necessary.
Steering column shaft Tilting angle-4.0/ 0° /+4.0° / +8.0°
This section describes the power steering pump and gear box based on the HPS (Hydraulic Power
Steering) system. For the information of the SSPS (Speed Sensing Power Steering) system, refer to
SSPS section under CHASSIS.

12-4
Power steering gearbox &
solenoid valve for SSPS model
2. MAJOR CHANGES
SSPS control unit
Installed view Unit components
It is installed at the bottom of the ECU inside the passenger's floor mat
foot protector cover and receives data related to the vehicle speed and
throttle position through the CAN communication and controls the
solenoid valves to obtain optimal steering force.
SSPS Solenoid Valve
SSPS (Speed Sensing Power Steering) system adopted ▶
Tie Rod End
Tie Rod
Bellows
SSPS Solenoid Valve
Valve Assembly
Feed Tube
Mounting Bracket
Cylinder Tube
Rack Housing
Adjusting Plug 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

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SSPS warning lamp
Comes on when SSPS system has a fault
Power steering supply hose and return hose for
SSPS model
Power steering pump with SSPS
Installed view Pump components

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2) Steering Gear Linkage
Linkage assembly - gear & operation ball
joint
Bolt (100 ~ 130 Nm)
Nut (100~130 Nm)
Bolt (100 ~ 130 Nm)
Nut (100~130 Nm)
Bolt (100 ~ 130 Nm)
Pin 1.
2.
3.
4.
5.
6.
7.Nut
End assembly - tie rod
Boot kit - power steering gear box
Nut
SSPS module
Clamp - mounting
Rubber - MTG 8.
9.
10.
11.
12.
14.
15.

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Oil Change ▶
Open the power fluid reservoir cap and drain
the fluid completely with oil suction device. To
make it easy, turn the steering wheel to its
both ends several times.
Fill up the specified fluid into fluid reservoir
and bleed air from the steering system. 1.
2. Oil Level Check ▶
Place the vehicle on a level ground and start
the engine and let it run at idle speed.
Turn the steering wheel several times so that
the oil temperature reaches to normal
operating level (75~85˚C).
Place the steering wheel at straight ahead
direction.
Check the oil level in the power steering oil
reservoir. Adjust the oil level between MAX
and MIN. 1.
2.
3.
4.
If the difference between two measurements
is below 5 mm and the level is between MAX
and MIN level, it's normal. If it is over 5 mm,
bleed air from the system. Check the fluid level on a level ground with the
engine turned off. The fluid level should be
between the MIN and MAX marks on the
reservoir cap gauge.
below 5 mm
Engine idling Engine running
Oil typeS-PSF-3
Capacityapprox. 1ℓ (including
reservoir)

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Air Bleeding ▶
Lift up the vehicle very carefully.
Turn the steering wheel to its both ends
several times and add the oil up to MAX line
in the steering oil reservoir.
Periodically crank the starting motor and turn
the steering wheel to its both ends without
any interruption.
Check the oil level again. If the oil level is
fluctuated, repeat the procedures from step 3
to step 5.
Start the engine.
Turn the steering wheel to its both ends until
any bubble can be found in the steering oil
reservoir.
Perform the test drive and check the steering
wheel for normal operation and noise.
If the oil level abruptly goes up, bleed the air
from the system again. 1.
2.
3.
4.
5.
6.
7.
8.
The air bleeding should be done after servicing
the power steering system and when the
difference between two measurements (cooled
and normal temperature) is prominent.
Max
Min
Normal Abnormal
If the air bleeding is not properly performed,
the life span of the power steering pump
may be shortened. -

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Oil Pump Pressure Check ▶
Unscrew the pressure line fitting in power
steering pump.
Install the pressure gauge between the
power steering pump and the power steering
oil pressure line.
Place the shift lever to neutral position. Apply
the parking brake.
Open the valve in pressure gauge. Start the
engine and let it run at idle speed.
Turn the steering wheel several times so that
the oil temperature reaches to normal
operating level. 1.
2.
3.
4.
5.
Before checking the pressure, check the oil
level and belt tension. Prepare the empty
container to collect the spilled oil during the
service. Check the oil pump pressure to locate any
defect in oil pump.
Fully close the valve in pressure gauge and
measure the oil pressure. 6.
Relief pressure
90 ± 3 bar
Oil pump
Steering gear box
To prevent internal damage, do not close
the gauge valve over 10 seconds.
Keep the oil temperature at proper range. -
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