MITSUBISHI COLT 2006 Service Repair Manual

GENERAL INFORMATION
ENGINE COOLING14-2
GENERAL INFORMATION
M2140000100638
The cooling system is a water-cooled pressurized,
forced circulation type which offers the following fea
-
tures:
•To stabilize engine coolant temperature, the ther-
mostat is located at the coolant inlet port from the
radiator.
•To improve engine cooling performance and save
weight, a plastic radiator tank and aluminium radi
-
ator fins are used.
•In order to save the weight, the A/C condenser
fan has been abolished, and one-fan system has
been adopted to secure sufficient cooling effect
using the radiator fan only.
•A radiator condenser tank integrated with a radia-
tor has been adopted in order to save the weight.
•A cross flow type radiator assembly whose tanks
are installed on the both sides of the radiator fins
has been adopted in order to decrease the over
-
all height of the radiator and improve the aerody-
namic performance.
•Sufficient radiator fin area and cooling fan diame-
ter are secured, and the radiator fin pitch is
increased. As a result, the capacity of the cooling
fan motor is reduced cutting down the power con
-
sumption, and the noise and weight of the cooling
fan are reduced.
SPECIFICATIONS
Item4A9-M/T4A9-CVT4G1
Cooling methodWater-cooled pressurized, forced circulation with electrical
fan
Water pumpTy p eCentrifugal impeller
Drive methodDrive belt
ThermostatTy p eWax pellet with jiggle valve
Valve open temperature
°C
82 ± 282 ± 1.5
RadiatorTy p ePressurized corrugate type
Core size (width × height
× thickness) mm
369.8 × 624.2 × 16
Performance kJ/h155,200175,300
Engine coolantSpecified coolantDIA QUEEN SUPER LONG LIFE COOLANT or equivalent
Quantity (including radiator
condenser tank) L5.35.46.8

GENERAL INFORMATION
ENGINE COOLING14-3
CONSTRUCTION DIAGRAM
<4A9-M/T>
AC601241AB
Cooling fan shroudRadiator finsCooling fan
Radiator condenser
tank
Radiator tank Cooling fan motor Radiator tank
<4A9-CVT>
AC601593AB
Cooling fan shroud
Radiator finsCooling fan
Radiator condenser
tank
Radiator tank Cooling fan motor Radiator tank

GENERAL INFORMATION
ENGINE COOLING14-4
<4G1>
AC601594AB
Cooling fan shroud
Radiator fins
Cooling fan
Radiator condenser
tank
Radiator tank Cooling fan motor Radiator tank

GROUP 37
POWER STEERING
CONTENTS
GENERAL INFORMATION . . . . . . . .37-2
CONSTRUCTION DESCRIPTION . . .37-5
STEERING WHEEL . . . . . . . . . . . . . . . . . . 37-5
STEERING SHAFT AND COLUMN . . . . . . 37-5
ELECTRICAL POWER STEERING . .37-7
GENERAL INFORMATION . . . . . . . . . . . . . 37-7
STEERING GEAR . . . . . . . . . . . . . . . . . . . . 37-9
MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37-9
ELECTRIC POWER STEERING-ECU . . . . 37-10
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . 37-11

GENERAL INFORMATION
POWER STEERING37-2
GENERAL INFORMATION
M2370000100851
Electric power steering system has been adopted for
all models in order to ensure an optimised steering
feeling.
FEATURES
•Improved fuel consumption by reduction of
engine load, and weight saving by decrease of
the number of parts have been achieved with the
introduction of the electric power steering system.
•3-spoke type steering wheel integrated with an
SRS airbag has been adopted.
•Impact-absorbing mechanism and tilt steering
mechanism have been adopted.
SPECIFICATIONS
ItemSpecifications
Vehicles with
14-inch wheelsVehicles with
15-inch wheelsVehicles with
16-inch wheels
Steering wheelTy p e3-spoke type
Outside diameter mm370
Maximum number of turns3.43.22.6
Steering columnColumn mechanismShock absorbing mechanism and tilt steering
mechanism
Power steering typeElectric powered type
Steering gearTy p eRack and pinion
Stroke ratio (Rack
stroke/Steering wheel
maximum turning radius)44.1550.46
Rack stroke mm150143130
Steering angleInner wheel41 ° 40’39 ° 00’34 ° 10’
Outer wheel35 ° 30’33 ° 40’30 ° 00’

GENERAL INFORMATION
POWER STEERING37-3
CONSTRUCTION DIAGRAM
AC405883AB
Steering wheel
Steering column assembly
Selector lever assembly
Electric power
steering-ECU
Motor
Torque sensor
Tie-rod end Steering gearDash panel cover

AC405884AB
Steering wheel
Steering column assembly
Electric power
steering-ECU
Motor
Torque sensor
Tie-rod end
Yoke bearing
Steering gearDash panel cover

GENER
A L IN FORMA T ION
POWER ST E E RING37-4

CONSTRUCTION DESCRIPTION
POWER STEERING37-5
CONSTRUCTION DESCRIPTION
STEERING WHEELM2370001000590
AC314233
AC31427AC206024AB
A
A Section A - A
InflatorAir bag module
The steering wh
eel is de sig ned to impro v e operat ion
ability
, safety and main t a inabilit y and has the follow
-
ing features:
•New 3-spoke type stee ring whe e l which fe atures
uret
hane a nd real lea t her types has been
ado
pted. The leather stee ring wh eel is o f fere d as
a st
a ndard f o r the models with VRX, and of fered
as a st
an dard for the models with LS.
•It ha s a built-in a n SRS a i r ba g to pro t ect t he
driv
er in c a s e of a front a l c o ll is i o n.
•The air b ag mo dule is equip ped wit h an inflat or
tha
t does not cont ain sod i um azide.
STEERING SHAFT AND COLUMN
M23700020 0027 0
AC206072AB
Tilt bolt
Tilt pin
Lower shaft Tilt leverUpper shaft
T
i lt steering mecha n ism allowing desired d r iving
position
(tilt -up/tilt-down: 1 5 mm/20mm) ha s be en
inst
alled for all mo dels. Additiona lly , imp a ct-absorb
-
ing mechanism h a s be en in troduced to the steering
colu
mn t o absorb an imp a ct during collision an d pro
-
te c t dri v er .

CONSTRUCTION DESCRIPTION
POWER STEERING37-6
IMPACT-ABSORBING MECHANISM
Primary collision
AC207724AB
Lower shaft ALower shaft B
After impact
Before impact
When a
vehicle is crashed a nd the lower shaf t is
loade
d from the g earbox side, the lower shaf t A is
forced
into the lower sha f t B t o absorb an imp a ct
load.
Thus, the steering column will not be projecte d
into t
he p a ssenge r comp artme n t to red u ce possible
chest in
jurie s .
SECONDARY COLLISION
AC207397AB
Upper shaft B
Before impact
After impact Upper shaft A
When th
e driver ’ s we ight is loaded to the stee ring
wh
eel a f ter air ba g deployment, the steerin g co lumn
sep
a ration mechanism built into the rot a tiona l a x is of
the upp
er-side tilt lever (t ilt b o lt) a nd the lower-side
tilt
fulcrum (t ilt p i n) move s the stee ring colu mn
assembly fo
rwa r d. The upper shaf t can also b e fur
-
ther retrac ted forward as sh own in the figure.

ELECTRICAL POWER STEERING
POWER STEERING37-7
ELECTRICAL POWER STEERING
GENERAL INFORMATIONM2370000100862
Vehicle-speed sensitive electric power steering
(whole range type) has been adopted. This system
allows a light steering force during stationary steer
-
ing manoeuvre or low speed driving, and a moderate
steering force during medium or high speed driving.
For vehicles with this system, the electric power
steering-ECU controls the motor current according to
the vehicle speed and steering force of the steering
wheel.
CAN* communication has been adopted in order to
communicate with another ECUs for obtaining nec
-
essary information related to this control, achieving
wiring harness saving and secure data communica
-
tion.
NOTE: *: For more information about CAN (Control-
ler Area Network), refer to GROUP 54C, General
Information
P.54C-2.
SPECIFICATIONS
ItemSpecification
MotorTy p ePermanent magnetic field type
Rated voltage (V)DC12
Rated current (A)50
Torque sensorTy p eNoncontact type (Inductance detection type)
Electric power
steering-ECUControl typeMicrocomputer control (16 bit)
Rated voltage (V)DC12
SYSTEM CONFIGURATION
AC601667AB
Electric power
steering-ECU
Ignition switch
Power supply to electric
power steering-ECU
Vehicle speed sensor
Motor Motor current value Engine speed
Torque sensor signal (main) Electric power
steering warning lamp
Diagnosis connector
Motor current
Torque sensor
Torque sensor signal (sub) Engine-CVT-ECU or
engine-ECU
NO
TE: Dash ed lines indicat e CAN-bu s lines.