2012 SSANGYONG KORANDO Service Manual

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Installation of steering
gear box and pipeInstallation of pipe
Installation of reservoir and hoseInstallation of power steering pump
and pipe
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 pipe
Supply pipe

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1. SPECIFICATION
Unit Description Specification
System operationOperating type Motor driven power steering system
Operating temperature- 40°C to 80°C
Rated voltage 12 V
Rated current 85 A
Operating voltageNetwork 8 to 16 V
C-EPS ECU 8 to 16 V
Full Performance 10 to 16 V
MotorType 3-Phase BLAC (Brushless AC)
Rated current/voltage 85 A / 12 V (at idle 0.5 A)
Position sensor type Hall sensor type
Torque & angle sensorType Non-contact type
Steering columnOperating type Manual tilting & telescoping
Lower shaftType Sliding (Ball slip) type
Steering gearGear ratio 46.94 mm/rev
Rack stroke 146 mm
Maximum steering angleInner wheel39°
Outer wheel31.24°

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2. TIGHTENING TORQUE

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3. DIFFERENCES BETWEEN HPS AND EPS
HPS EPS
1 Crankshaft pulley (DDU)
2 Auto tensioner
3 Tensioner pulley
4 Vacuum pump
5 A/C compressor pulley
6 Alternator pulley
7 Water pump pulley
8 No.1 idle pulley
9 No.2 idle pulley
10 Power steering pump -
HPS (Hydraulic Power Steering)EPS (Electric Power Steering)

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Hydraulic power steering Electric power steering
1. OVERVIEW
The electric power steering, EPS, does not have any belt-driven steering pump constantly running, so it
is lightweight and the motor consumes energy only when the steering wheel is turned by the driver, and
this leads to improvement in fuel efficiency. Also, the elimination of a belt-driven pump and its
accessories greatly simplifies manufacturing and maintenance. While offering these benefits, as it does
not contain any steering oil, the environment is not polluted both when the steering system is produced
and discarded.
In other words, the electric power steering (EPS) system uses the electric motor to assist the steering
force. It functions independently regardless of whether the engine is running or not, unlike the existing
hydraulic power steering.
The EPS system generates an assist steering force variably depending on the driving conditions by
controlling the motor's operation, based on the input signals from the sensors such as torque sensor and
angle sensor. In turn, the EPS receives the torque signal by the driver's movements of the steering
wheel, as well as the vehicle speed, and uses the motor to determine the assist torque. The EPS
controls the motor for this. Another features of EPS are fail-safe function, diagnosis function,
communication function between units and interface function for external diagnostic device.
The EPS system components such as the torque sensor, steering angle sensor, fail-safe relay, etc. are
located in the steering column and EPS unit assembly.
Advantages: ▶
Assurance of improved steering
Provides optimal steering force according to the
vehicle speed
Enhanced steering stability while driving at high
speed (1)
-
-Reduced fuel consumption
Consumes energy only when steering wheel
is turned (improved by 3 to 5%)
Energy saving (reduced by 85% compared
with hydraulic power steering)
Reduced number of parts: Elimination of
steering pump, hydraulic hose, pump pulley,
oil reservoir, belt, bracket, etc. (2)
-
-
-
Comparison between hydraulic power steering and electric power steering (EPS) ▶

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2. OPERATION
When the driver turns the steering wheel, a torque is generated and the torque sensor and the steering
angle sensor in the EPS system detect the rotation of the steering column to run the electric motor. At
this time, the worm gear connected to the motor drives the helical gear mounted to the steering column
to generate the assist torque for the steering column. This allows the driver to operate the steering wheel
easier.Output torque = 1) Steering force (manual torque) + 2) Assist torque

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1. SPECIFICATION
1) Appearance of Wheels
16 inch: 215/65R 16 17 inch: 225/60R 17 18 inch: 225/55R 18
Description Specification Remark
Tire16 inch 215 / 65R 16 Standard
17 inch 225 / 60R 17 Optional
18 inch 225 / 55R 18 Optional
Tire inflation pressure32psi -
Wheel16 inch 6.5 J X 16 Standard
17 inch 6.5 J X 17 Optional
18 inch 6.5 J X 18 Optional
Balance weightInner: Clip-on type
Outer: Adhesive type-
-
Tightening torquse of wheel bolt127.4 ~ 156.8 Nm 17mm X 5
(Length:56.5 mm)

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1. OVERVIEW
A radial tire uses a cord angle of 90 degrees. That is, the cord material runs in a radial or direct line from
one bead to the other across the tread. In addition, a radial tire has a belt overwrap under the tread
surface to provide greater structural stability. The belt overwrap of a radial tire distortion while the radial
structure enables high speed driving.
Tire supports the weight of the vehicle, reduces the impact from the road and at the same time,
transmits the power to propel, brake and steer on the road. It also functions to maintain a
<009d008c008f0090008a0093008c02c5009a004700940096009d008c0094008c0095009b0055004700700095004700960099008b008c00990047009b00960047008a0096009400970093008c009b008c0047009a009c008a008f0047009b0088009a009200
9a0053004700880047009b00900099008c00470094009c009a>t be structured to be a resilient
vessel of air.
There is wear limit mark on the tire, which protrudes as a strip shape located approximately 1.6 mm from
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950047008d0099009600940047009b008f008c00470096009c>tside so there is additional "▲"
mark on the shoulder to let the driver find the wear mark easily. To measure the tire groove depth,
measure at any point other than the point which has a wear limit mark.
The tire is worn unevenly according to the driver's driving habit, improper servicing, low tire inflation
pressure, changed tire location, etc.
1) Structure of Tire
Tread
This thick layer of rubber provides the interface
between the tire and the road. Wear-resistant
rubber is used to protect the carcass and belt
against fractures and impacts and to deliver a
long driving life.
Shoulder
Located between the tread and sidewall, the
shoulder rubber is the thickest so that the design
must allow for the easy diffusion of heat
generated within the tire while driving.
Sidewall
The part between the shoulder and bead, the
flexible sidewall protects the carcass and
enhances the ride. A tire’s type, size,
structure, pattern, manufacturing company,
product name and various characters are
indicated here. Bead
The bead attaches the tire to the rim and wraps
the end of the cord fabric. Comprised of the bead
wire, core, flipper and other parts, the bead is
generally designed to be slightly tight around the
rim so that in the case of a sudden drop in inflation
pressure, the tire will not fall off the rim.
Carcass
As the most important framework of a tire, the
entire inner layer of cord fabric is called the
carcass. The carcass acts to support air pressure,
vertical load and absorb shocks.
Valve
Belt
Bead core