Page 600 of 796

04-54120-01
1. OVERVIEW
The axle is the device of transferring the drive power from the engine to the wheels; its inside is fitted to
the side gear spline of the differential gear and outside is connected to the drive wheels. The axles in
front and rear of vehicle are known as the front axle and rear axle respectively.
For the FR (Front engine, Rear wheel drive) type vehicle driven by the rear wheels, the drive power is
basically transferred to the rear wheels in the following order in 2WD mode: Engine-
>Clutch→Transmission→Propeller shaft (Rear propeller shaft)→Final reduction gear (Rear
axle)→Rear axle shaft→Rear wheels. In 4WD mode, the drive power to the rear wheels is
distributed to the front wheels in order of Front propeller shaft->Front axle->Front axle shaft->Front
wheel via the T/C assembly. And, 4WD solenoid valve releases the vacuum and engage the locking
hub actuator to the LH/RH front hub end gear to transfer the drive power of the axle shaft to the front
wheels.
The front axle and front axle shaft are used in only 4WD model. The rear axle has the independent
rear drive axle (IRDA) which is used on the independent rear suspension (IRS).
Front axleTransmission
Transfer case
Front propeller shaft Rear propeller shaftRear axle
Page 621 of 796

07-6
1) Front Suspension (Double Wishbone)
Suspension is the term given to the system of springs, shock absorbers and linkages that connects a
vehicle to its wheels and allows relative motion between the two. Suspension systems serve a dual
purpose - contributing to the vehicle's road-holding/handling and braking for good active safety and
driving pleasure, and keeping vehicle occupants comfortable and reasonably well isolated from road
noise, bumps, and vibrations, etc. These goals are generally at odds, so the tuning of suspensions
involves finding the right compromise. It is important for the suspension to keep the road wheel in contac
t
with the road surface as much as possible, because all the forces acting on the vehicle do so through
the contact patches of the tires. The suspension also protects the vehicle itself and any cargo or luggage
from damage and wear.
2) Rear Suspension (Multi Link Type)
1. OVERVIEW
Double wishbone suspension is an independent
suspension design using two (occasionally
parallel) wishbone-shaped arms to locate the
wheel. Each wishbone or arm has two mounting
points to the chassis and one joint at the knuckle.
The shock absorber and coil spring mount to the
wishbones to control vertical movement. Double
wishbone designs allow the engineer to carefully
control the motion of the wheel throughout
suspension travel, controlling such parameters as
camber angle, caster angle, toe pattern, roll
center height, scrub radius, scuff and more.
The multi-link type is used for the rear
suspension to distribute the internal force (load)
applied to the link while driving. Also, the change
in camber or toe and shock load from the road
has been minimized by optimizing the link
arrangement.
Page 635 of 796
08-8
Problem Cause Action
Burning smell
around tireToo frequent braking in high driving speed Reduce the use of
foot brake/use
engine brake
properly Use only foot brake during downhill driving
Driving with foot on brake pedal Get off the foot from
pedal
Foreign materials such as dirt or sand in brake system Replace: caliper,
wheel cylinder,
master cylinder,
return spring
Broken return spring in shoe assembly Replace
Incorrectly adjusted parking brake cable Adjust
Incorrect wheel or wheel cover
(generating the heat)Replace
Page 639 of 796
08-12
Let the engine run for 1 to 2 minutes and
stop it. If the brake pedal stroke is shortened
as pumping the brake pedal, the system is
normal. If not, the system is defective. 1.
Depress the brake pedal several times with
engine off. If the brake goes down when
starting engine with pedal depressed, the
system is normal. If not, the system is
defective. 2.
If the above three checks are OK, the system is
normal. If any condition is not met, check the
valve, vacuum hose and brake booster.
3) Brake Booster
OK
NG
Engine stopped
Engine running
Depress the brake pedal when the engine is
running. If the pedal height is not changed
for 30 seconds after stopping the engine, the
system is normal. If not, the system is
defective. 3.
Page 640 of 796

08-134850-03
Stop Lamp Switch
Connector Internal circuit
4) Stop Lamp Switch
Connect the multimeter to stop lamp switch
connector (N.O.) and check if the continuity
exists when pushing in the plunger. If the
continuity doesn't exist, the stop lamp switch
is normal.
Connect the multimeter to stop lamp switch
connector (N.C.) and check if the continuity
exists when pushing in the plunger. If the
continuity doesn't exist, the stop lamp switch
is normal. 1.
2.
TypePlunger
Pushed Not pushed
N.C ContinuityNot continuity
N.O Not continuity
Continuity
5) Pedal Free Play
Check the pedal free play with below
procedures: -
Stop the engine.
Depress the brake pedal several times to
discharge the vacuum pressure of the
brake booster.
Depress the brake pedal until you feel the
resistance, and measure the movement
(A). 1.
2.
3.
Specified value(A)3 ~ 10 mm
If the free play is below the specified value, check if
the clearance between the outer case of the stop
lamp and the brake pedal is within the specified
range. If the clearance is out of the specified range,
the clearance between the clevis pin and the brake
pedal arm is too large. Check the components and
repair if needed.
Page 651 of 796

09-54891-01
2. FUNCTION
1) Term Definition
ABS: Anti-Lock Brake System ▶
When the brake pedal is abruptly depressed, the HECU calculates the slip ratio of each wheel based
on information received from the wheel speed sensors and controls the hydraulic module data quickly
and precisely in order to maintain the friction between the road surface and tire optimal (static friction).
Therefore, by keeping the friction between the road surface and tire optimal, it is possible to obtain
following effects: Enhanced steering stability, improved direction stability, reduced stopping distance
and etc.
EBD: Electronic brake-Force Distribution ▶
This is to detect the tire speed from the wheel speed sensor in order to supply the braking pressure to
the rear tires individually. In other words, the HECU measures the tire deceleration speed continuously
and controls the rear inlet valve on the hydraulic modulator to obtain optimal braking force as much as
possible. Thereby, stopping distance, braking effect and straight stability are improved.
ESP: Electronic Stability Program ▶
This is used to make the vehicle stabilized to recognize the emergency driving conditions, and to
control the brake for each wheels and the engine power when the brake system or acceleration will not
work any more in dangerous circumstances.
TCS: Traction Control System ▶
When the wheel is slipping due to an excessive engine torque while starting off or driving, this controls
the driving force (braking force + engine torque) in order to prevent the wheel from slipping through the
engine or brake control.
AYC: Active Yaw Control ▶
This has been developed to help a driver avoid danger of losing control of the vehicle stability due to
understeer or oversteer during cornering, which is a part of the ESP function.
HBA: Hydraulic Brake Assistant ▶
Developed based on the fact that elderly drivers depress the brake pedal too soft even when hard
braking is necessary, this an assist system to operate the HECU drive motor immediately and apply
high braking force to the wheels when the brake pedal is depressed softly and the vehicle should be
braked in emergency.
ARP: Active Rollover Protection ▶
This is a supplementary device for safety in ESP system and can help minimize the rollover accidents
by detecting a potential rollover situation through the brake and engine control when making sudden
lane change or turning sharply by adding only the software, without any separate device or switch.
Page 653 of 796

09-74891-01
3. PRECAUTIONS
The warning lamp flashes and warning beep sounds when the ESP is operating
When the ESP operates during vehicle movement, the ESP warning lamp on the instrument
panel flashes and beep comes on every 0.1 second. The ESP system is only a supplementary
device for comfortable driving. When the vehicle exceeds its physical limits, it cannot be
controlled.
Do not rely on the system. Keep on the safe driving.
Feeling when ESP is working
When the ESP system activates, the feeling can be different depending on vehicle driving
conditions.
For example, you will feel differently when the ESP system is activated during the ABS is
operating with the brakes applied and when the brakes are not applied on a curve.
If the ESP system operates when the brake is applied, the brake pressure will be increased on
the corresponding wheel which already has braking pressure for the ESP controls.
Noise and vibration that driver feels when ESP system is operating
The ESP system may transfer noise and vibration to the driver due to the pressure changes
caused by the motor and valve operations in a very short period of time. And, keep in mind that
the output and vehicle speed could be decreased without rpm increase due to the ASR function
that controls the engine power. -
-
-
ARP Operation
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. -
Page 661 of 796
09-154891-01
(3) ESP Control
The ESP (Electronic Stability Program) has been developed to help a driver avoid danger of losing
control of the vehicle stability due to understeer or oversteer during cornering. The yaw rate sensor,
lateral sensor and longitudinal sensor in the sensor cluster and the steering wheel angle sensor under
the steering column detect the vehicle conditions when the inner or outer wheels are spinning during
oversteer, understeer or cornering. The ESP ECU controls against oversteer or understeer during
cornering by controlling the vehicle stability using input values from these sensors and applying the
braking force to the corresponding wheels independently. The system also controls the engine power
right before the wheel spin synchronized to decelerate the vehicle automatically in order to maintain the
vehicle stable during cornering.