2008 MITSUBISHI LANCER EVOLUTION X steering

GENERAL DESCRIPTION
MULTIPORT FUEL SYSTEM (MFI)13A-5

AK604118
Fuel tank
Fuel level
sensor Air
inlet
2 Exhaust engine
oil control valve
1 Intake engine
oil control valve4 Manifold absolute pressure sensor
2 Intake air
temperature sensor
1 Mass airflow sensor
6 Intake
camshaft
position
sensor
7 Exhaust
camshaft
position
sensor
3 Throttle position
sensor (main/sub)
5 Evaporative emission
purge solenoid
3 Throttle actuator
control motor
12 Fuel tank differential
pressure sensor
13 Fuel tank
temperature
sensor11 Heated oxygen sensor (rear)
10 Heated
oxygen
sensor
(front)
12 Heated oxygen sensor (3rd)
8 Crankshaft position sensor5 Engine
coolant
temperature
sensor
9 Knock sensor
4 Injector
Fuel pump Fuel pressure
regulator Evaporative
emission
canister
6 Evaporative
emission
ventilation
solenoid
7 EGR valve
(stepper motor)
1 Mass airflow sensor
2 Intake air temperature sensor
3 Throttle position sensor (main/sub)
4 Manifold absolute pressure sensor
5 Engine coolant temperature sensor
6 Intake camshaft position sensor
7 Exhaust camshaft position sensor
8 Crankshaft position sensor
9 Knock sensor
10 Heated oxygen sensor (front)
11 Heated oxygen sensor (rear)
12 Heated oxygen sensor (3rd)
13 Fuel tank differential pressure sensor
14 Fuel tank temperature sensor
Ignition switch-IG
Ignition switch-ST
Power supply
CAN communication (input signal)1 Intake engine oil control valve
2 Exhaust engine oil control valve
3 Throttle actuator control motor
4 Injector
5 Evaporative emission purge solenoid
6 Evaporative emission ventilation
solenoid
7 EGR valve (stepper motor)
Ignition coil, ignition power transistor
Multiport fuel injection (MFI) relay
Fuel pump relay
Starter relay
Throttle actuator control motor relay
Generator G terminal
Heated oxygen sensor heater
A/C compressor relay
Diagnostic output
CAN communication (output signal) SenseAct
Engine oil pressure switch
Power steering pressure switch
Generator FR terminal
Generator L terminal
Vehicle speed sensor Accelerator pedal position sensor (main/sub)
Decide
ECM
(with barometric
pressure sensor)
AB

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-19
.
POWER STEERING PRESSURE SWITCH
A power steering pressure switch is installed on the power
steering oil pump. The power steering pressure switch uses a
contact switch to detect the power steering oil pressure. When
power steering oil pressure rises due to operation of the steer
-
ing wheel, the power steering load switch outputs an ON signal
to ECM. ECM performs idle-up according to the voltage and
prevents reduction in engine speed due to power steering load
and so maintains stable idle speed.
.
AK602228
ON
OFF
AD
12
0ONOFF ECM terminal voltage V
Oil pressure:lowOil pressure: high Operating pressure
Oil pressure kPa (in.Hg) Engine oil
pressure switch
ECM
AK601174AF
Power steering
pressure switch
Oil
pressure
AK602213
ON
OFF
AE
Oil pressure:low
Oil pressure: highOperating pressure
Power steering
pressure switch12
0OFF
ON
ECM
ECM
terminal voltage V
Oil pressure kPa (in.Hg)

THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE SPEED CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-38
THROTTLE VALVE OPENING ANGLE CONTROL AND IDLE
SPEED CONTROL
M2132003500328
ECM detects the amount of accelerator pedal
depression (as per operator's intention) through the
accelerator pedal position sensor. Based on pre-set
basic target opening angles it adds various compen
-
sations and controls the throttle valve opening angle
according to the target opening angle.
While starting
ECM adds various compensations to the target
opening angle that are set based on the engine cool
-
ant temperature, so that the air volume is optimum
for starting.
While idling
ECM controls the throttle valve to achieve the target
opening angle that are set based on the engine cool
-
ant temperature. In this way best idle operation is
achieved when engine is cold and when it is hot.
Also, the following compensations ensure optimum
control.
While driving
Compensations are made to the target opening
angle set according to the accelerator pedal opening
angle and engine speed to control the throttle valve
opening angle.
AK602236AE
Throttle
position
sensorMain
Main Sub
SubMotor drive circuit
A/C switch (CAN) Engine coolant
temperature sensor
Intake air temperature
sensor
Crankshaft position sensor
Power steering pressure
switch
Generator FR terminal
Transmission range
switch (CAN) Motor drive power supply
(From throttle actuator
control motor relay)
Throttle actuator
control motor
Control unit
Barometric pressure
sensor Accelerator
pedal position
sensor
ECM

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.

INSTRUMENT PANEL ASSEMBLY
TSB Revision
INTERIOR52A-3
CAUTION
•Refer to GROUP 52B-SRS Service Precautions P.52B-24 and Air bag Module and Clock Spring
P.52B-367 before removing the passenger side air bag module.
•Do not subject the SRS-ECU to any shocks when removing or installing the instrument panel.
Pre-removal and Post-installation Operation
•Removal and Installation of Front Pillar Trim (Refer to P.52A-10).
•Removal and Installation of Instrument Under Cover
(Refer to P.52A-10).
•Removal and Installation of Glove Box (Refer to P.52A-10).
•Removal and Installation of Instrument Cover Lower, Air
Outlet Garnish (Refer to P.52A-10).
•Removal and Installation of Audio Unit (Refer to GROUP
54A, Radio with CD Player P.54A-307).
•Removal and Installation of Audio Visual Navigation Unit,
GPS antenna (Refer to GROUP 54A, MMCS P.54A-391).
•Removal and Installation of Steering shaft (Refer to
GROUP 37, Steering Column Shaft P.37-25).
•Removal and Installation of Hands-free Cellular Phone
System (Refer to GROUP 54A, Hands-free Module
P.54A-435).
•Removal and Installation of Sensors (Refer to GROUP
55B, Interior Temperature Sensor
P.55B-25).

GENERAL INFORMATION
REAR SUSPENSION34-2
GENERAL INFORMATIONM2340000100977
The trailing arm type multi-link suspension is
adopted.
.
MAIN FEATURES
•The wheel tread is increased to improve corner-
ing ability.
•The roll center height is modified to improve the
steering ability.
•A double crossmember is adopted and the upper
arm, lower arm, toe control arm are joined to the
crossmember to improve suspension alignment
accuracy and maintenance performance.
•Improvement of arms installation accuracy elimi-
nates the camber adjustment to improve mainte-
nance performance.
•The trailing arm bushings are installed in the
upper position to improve the movement of the
suspension when the vehicle negotiates bumps
and increase riding comfort.
•Twin tube type shock absorber is adopted to
secure optimum rolling rigidity and improve the
steering ability.
•A high efficiency ball joint type stabilizer link is
adopted to improve steering ability.
•The toe control arm is installed in the lower posi-
tion to increase toe and camber rigidity and
improve steering ability.
CONSTRUCTION DIAGRAM
SPECIFICATIONS
.
SUSPENSION SYSTEM
.
AC606248AB
Stabilizer bar

Trailing arm Stay Rear crossmember Toe control armCoil spring Shock absorber
Upper arm
ItemSpecification
Suspension typeTrailing arm type multi-link

GENERAL INFORMATION
FRONT SUSPENSION33-2
GENERAL INFORMATIONM2330000100965
The MacPherson strut type suspension is adopted..
MAIN FEATURES
•The wheel tread is increased to improve corner-
ing ability.
•The roll center height is modified to improve the
steering ability.
•Increased suspension stroke improves road hold-
ing quality, and secures good adhesion even on
bumpy-rough roads to reduce shocks received
when the vehicle negotiates bumps.
•The fully flattened crossmember improves the
left/right direction rigidity of installation points of
the lower arms for high steering ability.
•Tuning of the lower arm bushes improves the
steering ability and riding comfort.
•The stabilizer bar is joined to the strut for high
efficiency to secure the optimum rolling rigidity,
and improves the steering ability.
•Total tuning of struts, springs, and bump rubbers
improves the steering ability and riding comfort.
CONSTRUCTION DIAGRAM
SPECIFICATIONS
.
SUSPENSION SYSTEM
.
WHEEL ALIGNMENT
AC607283AB
Stabilizer bar Coil spring
Front suspension strut Stabilizer link
Lower arm
Front axle crossmember
ItemSpecification
Suspension typeMacPherson strut with coil spring
ItemSpecification
Camber−0°05'

37-1
GROUP 37
POWER STEERING
CONTENTS
GENERAL INFORMATION . . . . . . . .37-2
STEERING WHEEL . . . . . . . . . . . . . .37-3
STEERING SHAFT AND COLUMN . .37-4
OIL PUMP . . . . . . . . . . . . . . . . . . . . . .37-6
STEERING GEAR . . . . . . . . . . . . . . . .37-7
OIL RESERVOIR . . . . . . . . . . . . . . . .37-8