2013 SSANGYONG NEW ACTYON SPORTS Service Manual

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1) Idling and Normal Braking Condition
In this position, the separation valve and the inlet valve are open (normal open), the electrically operated
shuttle valve and the outlet valve are closed.
When the brake is applied under these conditions, the brake fluid will be sent to each wheel via the
separation valve and inlet valve.

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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.

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3) HOLD (ESP is working) Mode
The Inlet valve and outlet valve will be closed to maintain the pressure in the hydraulic circuit applied at
the wheels. By closing the valves, the hydraulic pressure at the wheels will not be lost or supplied any
more. During ESP operation, the separation valve closes and only the shuttle valve at the pump opens.

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4) RISE (ESP is working) Mode
The shuttle valve and inlet valve will be open and the separation valve and outlet valve will be closed.
Then, the pump is operated. When ESP operates while the ABS is operating, the pressure will be
increased continuously until just before the corresponding wheel gets locked.

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5) Hydraulic Circuit of HBA
The above figure shows one front and one rear wheel and the same hydraulic circuit forms as in the
ESP operation. When HECU recognizes that it is an emergency and it is required for hard braking,
depending on the pressure value of the brake pressure sensor and pressure changes caused by the
pressure sensor timing, it operates the pump immediately to apply the brake pressure at the wheels.
Then, the pressure in the pump increases until just before the corresponding wheel gets locked. The
motor still keeps rotating and the outlet valve and the separation valve will stay closed. When the wheel
starts to lock, the HBA function cancels and switches to ABS operation.

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8. CIRCUIT DIAGRAM

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Only ESP

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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.