2008 MITSUBISHI LANCER EVOLUTION X power steering fluid

THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE SPEED CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-39
List of main compensations for throttle valve opening angle and idle speed control
Initialize control
After ignition switch turns OFF, ECM drives the throt-
tle valve from fully closed position to fully open posi-
tion and records the fully closed/open studied value
of the throttle position sensor (main and sub) output
signals. The recorded studied values are used as
studied value compensation for compensating basic
target opening angle when the engine is started next.
CompensationsContent
Stable idle compensation (immediately after start)In order to stabilize idle speed immediately after
start, target opening angle is kept big and then
gradually reduced. Compensation values are set
based on the engine coolant temperature.
Rotation speed feedback compensation (while
idling)In case there is a difference between the target idle
speed and actual engine speed, ECM
compensates the throttle valve opening angle
based on that difference.
Atmospheric pressure compensationAt high altitudes atmospheric pressure is less and
the intake air density is low. So, the target opening
angle is compensated based on atmospheric
pressure.
Engine coolant temperature compensationCompensation is made according to the engine
coolant temperature. The lower the engine coolant
temperature the greater the throttle valve opening
angle.
Electric load compensationThrottle valve opening angle is compensated
according to electric load. The greater the electric
load, the greater the throttle valve opening angle.
Compensation when shift is in D range When transmission is changed from P or N range
to some other range, throttle valve opening angle is
increased to prevent reduction in engine speed.
Compensation when A/C is functioningThrottle valve opening angle is compensated
according to functioning of A/C compressor. While
A/C compressor is being driven, the throttle valve
opening angle is increased.
Power steering fluid pressure compensationThrottle valve opening angle is compensated
according to power steering functioning. When
power steering oil pressure rises and power
steering pressure switch is ON, the throttle valve
opening angle is increased.

GENERAL INFORMATION
POWER STEERING37-2
GENERAL INFORMATIONM2370000101003
FEATURES
A hydraulic power steering system has been adopted
to all models.
This steering system offers the following features:
•The support method of the steering gear to the
crossmember is realised by the left and right
internal bushings with inner cylinders. This sup
-
port method achieves higher rigidity of the steer-
ing gear and improves the steering feeling.
•Configuring the optimum flow characteristics and
gear valve feature improves the handling stability.
•Appropriate application of friction to the steering
gear cuts off the disturbance from the road sur
-
face and improves the stability during the
straight-ahead driving.
•Optimisation of the flexible tube in the high pres-
sure hose reduces the pump noise.
SPECIFICATIONS
ItemsSpecifications
Steering wheelTy p eThree-spoke type
Outside diameter mm (in)375 (14.7)
Maximum number of turns3.16
Steering columnColumn mechanismShock absorbing
mechanism and Tilt steering
mechanism
Power steering typeIntegral type (Engine
speed-dependent type)
Oil pumpTy p eVane type with fluid flow
amount control system
Basic discharge amount cm3/rev. (cu in/rev)8.1 (0.49)
Relief pressure MPa (psi)8.8 (1,276)
Reservoir typeSeparate type (Resin made)
Steering gearTy p eRack and pinion type
Stroke ratio (Rack stroke/Steering wheel
Maximum turning radius) mm/rev (in/rev)45.58 mm/rev (1.79 in/rev)
Rack stroke mm (in)144
Steering angleInner wheel40°50’
Outer wheel33°50’
Power steering fluidSpecified lubricantsGENUINE MITSUBISHI
POWER STEERING FLUID
Quantity dm3 (qt)Approximately 1.0 (1.06)

OIL PUMP
POWER STEERING37-6
Secondary collision
When the driver's body falls against the steering wheel via the
deployed air bag, the column bracket moves forward by
deforming the rivet pin of the one-way capsule, and simulta
-
neously the steering column assembly frees from the pin of col-
umn bracket to move forward and downwards.
OIL PUMPM2370004000373
The oil pump is a vane type with a fluid flow control
system which functions so the steering wheel turning
effort will be reduced at low engine speeds and
increase at higher speeds. The oil pump is essentially the same as the conven-
tional one in construction.
AC611053AB
AA
BB
One way
capsule
Section B - BSection A - A Column
bracketRivet pin
Column pipe Before collision
After collision
AC607645AB
A
AColumn
bracket
Column pipe
Pin Section A - A

STEERING GEAR
POWER STEERING37-7
STEERING GEARM2370003000499
•The steering gear and linkage is mounted on the
suspension crossmember via two bushings with
inner cylinders.
•The inner bushing with inner cylinder supports
the steering gear and linkage in the vertical and
fore-and-aft direction with high rigidity, improving
the feeling of steering considerably.
•One-way check valve for the power steering fluid
has been added in the steering gear. By reducing
the kickback due to the disturbance from the
uneven road surface, the handling stability has
been improved.
AC607287AB
Tie-rod end
Gear housing
Gear housingTie-rod bellows
Front axle crossmember
Inner pipeBushing
Front suspension
crossmemberB
BView A
ASection B - B
One way
check valve

OIL RESERVOIR
POWER STEERING37-8
OIL RESERVOIRM2370005000376
The resin oil reservoir is used to reduce weight. The oil reser-
voir is translucent and has fluid level marks (MAX and MIN
lines), facilitating inspection.
AC200365 AC
Scale
Cap
O-ring
Filter Oil reservoir
Return
Suction