2013 SSANGYONG NEW ACTYON SPORTS low oil pressure

08-8
5. TROUBLESHOOTING
Problem Cause Action
Vehicle rollingBroken stabilizer bar Replace
Faulty shock absorber Replace
Abnormal noise.Loosening mounting Retighten
Damaged or worn wheel bearing Replace
Damaged shock absorber Replace
Damaged tire Replace
Poor ridingOver inflated tire Adjust pressure
Faulty shock absorber Replace
Loosened wheel nut Tighten as specified torque
Bent or broken coil spring Replace
Damaged tire Replace
Worn bushing Replace
Vehicle pulls to one sideDeformed arm assembly Replace
Worn bushing Replace
Bent or broken coil spring Replace
Hard steeringExcessive resistance of lower arm ball
jointReplace
Insufficient tire pressure Replace
Faulty power steering Replace
Unstable steering
Worn or loosened lower arm bushing Retighten or replace
Vehicle bottoming
Worn or broken coil spring Replace
Vehicle height loweredOver loaded on the vehicle -
Defective shock absorber Replace
Defective coil spring Replace

10-214892-01
2) DUMP (ABS is working) Mode
Even when the hydraulic pressure on each circuit is constant, the wheel can be locked as the wheel
speed decreases. This is when the ABS HECU detects the wheel speed and the vehicle speed and
gives the optimized braking without locking the wheels. In order to prevent the hydraulic pressure from
increasing, the inlet valve will be closed, the outlet valve will be opened and the oil will flow into the low
pressure chamber. In addition, the ABS HECU operates the pump to circulate the oil in the low pressure
chamber to the master cylinder. This may make the driver to feel the brake pedal vibration and some
Solenoid valve Valve Open/Close Pump motor
Inlet valve - Normal open (NO) valve Close
ON
Outlet valve - Normal close (NC) valve Open

10-234892-01
4) RISE (ABS is working) Mode
As the wheel speed increases, the inlet valve opens and the wheel's pressure increases due to the
master cylinder pressure. In addition, the pump circulates the oil in the low pressure chamber to the
wheel. As the hydraulic pressure to the wheel increases, the wheel speed will reduce. This operation
continues repetitively until there are no signs that the ABS HECU tends to lock the wheels. Since the
ABS hydraulic pressure control process takes place repeatedly for a short time, there may be some
vibration and noises at the brake pedal.
Solenoid valve Valve Open/Close Pump motor
Inlet valve - Normal open (NO) valve Open
ON
Outlet valve - Normal close (NC) valve Close

11-24
2) DUMP (ESP is working) Mode
The pressure decreases just before the wheel speed drops and the wheels are locked.
The inlet valve closes and the outlet valve opens as in the ABS HECU and the oil is gathered at the low
pressure chamber while no additional oil is being supplied. Then the pump operates to allow fast oil
drainage. The shuttle valve and the separation valve do not operate while decompression.

12-22
2. SYSTEM LAYOUT
The steering pump is driven by the engine power through a belt. This pump circulates the power steering
oil from the reservoir -> steering pump -> oil supply pipe -> steering gear box -> oil return pipe ->
reservoir to perform steering operations
Return hose & tube
Steering pump &
reservoir
High pressure hose
Linkage gear box Steering wheel
Lower shaft Column & shaft
Return hose & tube
Steering pump &
reservoir
High pressure hose
Linkage gear box Steering wheel
Lower shaft Column & shaft
HPS model
SSPS model

13-34620-01
1. SPECIFICATIONS
Item Item Specification
SSPS solenoid valveRated voltage DC 12 V
Rated voltage 1.0 A
Resistance6.7 ±1 Ω
Power steering oil pump
(with SSPS)Operating temperature-40℃~150℃
Release pressure 90 bar
Displacement 9.3 cc/rev
Flow velocity 9.75~6 l/mn
Pulley sizeØ115
Pulley type 6 groove
Housing material Aluminium
Power steering fluid reservoir
(with SSPS)Fracture pressuremin 8kgf/㎠
Air leakage2 kgf/㎠×min
Cap open torque 9.8 to 14.2 Nm
Oil capacity FULL 550cc
Power steering gear box
(with SSPS)Gear type Rack & pinion type
Gear ratio 40.245
Fixed rack 3.78
Gear weight 12.800 kg
Steering angleInner36.2°
Outer32.4°

13-10
▶ In medium and high speed driving
The shaft operation force of solenoid rod is reduced due to the reduction of output current from SSPS
control unit.
The coil spring pulls the PCV spool toward solenoid valve to open it.
The hydraulic pressure from pump flows to pinion reaction area through orifice and applies reaction
force to reaction plunger.
At this time, the reaction plunger transmits the reaction force to V-groove in input shaft to provide heavy
steerability. 1.
2.
3.
4.

13-114620-01
4) System Control
ECPS system, according to the vehicle speed,
enables to achieve proper steering
characteristics by controlling hydraulic
pressure to reaction plunger located in input
shaft of power steering gear box. In other words,
ECPS control unit enhances the parking
conveniences by controlling duty type current
control. It provides heavy steerability with low
current as the vehicle speed increases. And, it
provides light steerability with high current as the
vehicle speed decreases.
▶During parking and low speed driving
During parking and driving in low speed, the control unit supplies approx. 1 A of electric current to
solenoid valve. Then, the spool located in PCV compresses the upper spring and elevates upward and,
the working pressure from oil pump (A port) is not able to flow to the reaction plunger (C port). As a
result, the pressing force from reaction plunger disappears and the steerability enhances.