ECU MITSUBISHI COLT 2006 Service Manual Online

TECHNICAL FEATURES
GENERAL00-26
SCHEMATIC DIAGRAM
AC508098
Front impact against
another vehicleor
Front impact against a
solid surface Analogue G-sensor
Ignition judgment
Shock
above a
certain
level
Ignition signal
SRS-ECU
Front air bag safing
G-sensor
Front impact
sensor (RH)
Front impact
sensor (LH)
AB
In case of a
frontal collision, if the front imp act sensor
in the engine comp artment, the analogue G-sensor
in the SRS-ECU and t he front air bag safing sensor
simult aneously de tect an imp act th at excee d a cer
-
ta in threshold (turn ON), the SRS-ECU sen ds an
ignition signal to the air bag modules (squ ibs) and
seat belt with pre-te nsioners (squibs) on the driver
and p asseng er sides, thus inflating the air bag s and
operating the seat belt with pre -tensioner s.
SEAT BEL T RETRACT OR WITH FORCE
LIMITE R
The driver ’s /front p asseng er’s seat belt retractor has
been e quipped with a force limit er. The force limiter
is a device which operat es when a predetermined
force is applied, an d limits the for ce.
OPERA TION
1. If collision energy is transmit ted to the seat belt,
th e ELR mechanism will oper ate to lock the seat
be lt.
AC100083
Torsion bar
Spindle
Belt
AC
2.
Then, if the en ergy increase s to a prede termined
value , the to rsion bar will b e distorted . As th e
spind le rot ate s tog ether with the t orsion bar , the seat b
elt webb ing is p ulle d out, reducing th e
imp act against t he occupants.
REAR SEA T BELT WITH CHILD SEA T FIX-
ING MECHANISM (ALR*)
The child seat fixing mechanism h as b een ad opted
to easily and securely fix the child seat that is not
comp atible with ISO FIX.
NO TE: *ALR: Automatic Lockin g Retractor
STEERING SHAFT AND STEERING COL-
UMN
The impact ab sorption mech anism in combin ation of
retract able steerin g shaft and steering co lumn disen
-
gagement mecha nism has been ad opted t o alle viate
the imp act from th e steering wheel to the d rive r.
BRAKE PEDAL AND PA RKING BRAKE
PEDAL
The bra ke pe dal b ackward mo vement restraint
mechanism to restrain the backward movement of
the brake p edal to the minimum at the time o f f ront al
collision h as b een ad opted so that the impact to th e
lower limb s of the driver can be alleviated.
CHILD SEAT FIXING BAR COMP ATIBLE
WITH ISO FIX*
The an chor bar has been equipped a s st andard fo r
easily and secu rely fixing the child seat comp atible
with ISO FIX.
NO TE: *ISO F IX: ISO (In ternational Orga nization for
S tand ardizatio n) complied child se at fixing method

TECHNICAL FEATURES
GENERAL00-27
POWER WINDOW WITH SAFETY MECHA-
NISM
The power window with safety mechanism has been
adopted to automatically roll down and stop the door
window glass as soon as the occurrence of jamming
is detected at the time of rolling up the door window
glass.
SUNROOF WITH SA FETY MECHANISM
The sunroof with safe ty mechanism has been
adopted so that the roof lid glass can move in the
reverse direction and stop when application of exter
-
nal force hinders the movement during the sliding to
close or tilt down operation.
TRIMS AND HEADLINING
The head impact absorption structure has been
adopted for the pillar trim, quarter trim, and headlin
-
ing so that impact towards the head of a passenger
can be reduced.
OTHER SAFETY FEATURES
•3-point ELR seat belts
•Child-protection rear door locks
•Front fog lamps
EQUIPMENTSM2000026000221
IMMOBILIZER SYSTEM
AC306415AC
M.U.T.-III
Ignition
key ring
antenna
Immobilizer-
ECU
Ignition key
Encrypted
code
Transponder Power
(Wireless)
Encrypted code
(Wireless) Control
signal
Engine-
CVT-ECU
All models are equipped with the e ngine immobilizer
system as st andard. The en gine immobilizer syst em
preve nts the engin e from starting and immobilizes
the vehicle if a key o ther tha n the key registered for
that vehicle is used in an attempt to start the e ngine
af te r forced entry . The en gine immobilizer syst em
consist s of the ignition key, key ring antenna, immo
-
bilizer-ECU, and engine-CVT-ECU.

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

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 STEERING37-3
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

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.

ELECTRICAL POWER STEERING
POWER STEERING37-8
ELECTRICAL PARTS AND FUNCTIONS
Parts nameDescription about function
SensorVehicle speed sensor (ABS-ECU)Sends the vehicle speed signal to the electric power
steering-ECU.
Torque sensorDetects a steering force, converts it into the voltage signal,
and then sends the signal to the electric power
steering-ECU.
ActuatorMotorGenerates assist torque by the steering operation to the
steering gear using the signals sent from the electric power
steering-ECU.
Electric power steering warning
lampWarns a driver of the system malfunction using the signal
sent from the electric power steering-ECU.
Electric power steering-ECUControl the actuator (motor) based on the signal sent from
sensor.
Controls the self-diagnostic fu nction and fail-safe function.
Controls diagnostic function (Compatible with M.U.T.-III).
GENERAL DESCRIPTION ON SYSTEM
AC207803
AC206444
AC206443
AB
Electric power
steering-ECU
Glove box
Torque sensor
Motor
T o improve opera t iona l reliabi lity , th e dual-circuit sys-
tem ha s be en ad opted f o r the t o rque sensor . If a n y
malfunct
i on occurs in the electric power st eering sys
-
tem, the fail-sa f e fun c tio n of th e ele c tric power steer-
ing-ECU is activated, and the ou tput current of the
electric power steerin
g-ECU a pplied to the motor is
turned o
f f. At th e sa me time, the steerin g syste m enters man ual mode, and informs a dr iver of the sys
-
tem malfu
n ction by illuminating th e warnin g lamp on
the
comb in at io n me te r . Th e warn in g la mp il lu min a te s
wh
en the following malfu n ct ions occur: ope n circuit
in the
e l ectric power stee ring system wiring harness,
poor connectio
n , ma lfunction s in the e l ectric power
steering-ECU, mo
tor , or sensors.

ELECTRICAL POWER STEERING
POWER STEERING37-9
STEERING GEAR
M2370003000239
AC208175
AC208174AC206443AC
NeutralSub
Torque sensor
Steered to leftMain
Steered to right
Output voltage (V)
Torque sensor characteristic chart
52.5
The torqu e sensor which detect s a opera t ed force of
the steerin
g wheel is inst alled in the stee ring g ear .
Whe
n th e st eer in g whe e l is tu rn ed , t h e ste e ring f o rce
is d
e tected by the to rque sensor . At the same time,
2-way supp
ly volt a ge signa l (main and sub ) are input
to the e
l ectric power steerin g-ECU.
MOT O RM237000 1 1 0003 6
AC208523
AC206443
AC207634
AB
View AMotor
Motor
View A
The mot
o r is inst alled in th e steering gea r . The ste e r-
ing motor is applied with a con t rol current sent from
the electric po
we r stee ring-ECU and genera t es t he
assist
torque to the steering ge ar according to the
steering op
eratio n.

ELECTRICAL POWER STEERING
POWER STEERING37-10
ELECTRIC POWER STEERING-ECU
M2370000800106
AC207827AB
Glove box
Electric power
steering-ECU
The electric powe r stee ring-ECU is att a ch ed below
the glove
box, wh ich is integ r ated wit h an input inter
-
face circu i t, a microco m p u ter , an outp u t d r ive circuit,
a fail-sa
f e rela y , and a mot o r line relay et c.
It is also integrated with a self-diag nostic fu nction,
and illuminate
s the warn ing lamp an d set s d i agno sis
code
to the diagn osis connector .
CAN COMMUNICATION
The electric powe r stee ring-ECU perfo rms the da t a
transf
e r with a nother ECUs through CAN communi
-
cation.
SignalReceiver ECU
Engine-CVT-ECU or
engine-ECUMeter and A/C-ECU
Motor current signal•−
Electric power steering warning lamp request signal−•
NOTE: • ind i ca tes items which sends and re ceives
dat
a throu gh CAN communicat i on.
FA IL - SAFE FUNCTION
If the e l ectric power st eering - ECU de tect s any mal-
functi on, it illuminat es th e warnin g lamp, de activate s
the electric po
we r stee ring f unct i on, a nd the n
switches
the steerin g system in to ma nual mode .
DIAGNOSTIC FUNCTION
Electric po wer ste e ring -ECU has the following fu nc-
tions for easie r system ch ecks.
•Diagnosis code set
•Service dat a outp u t
All the above ite m s can be diagnosed using
M.U.T
. -III.
DIAGNOSIS CODE SET
There a r e 22 d i agno stic ite m s. Since all the d i agn os-
tic result s are recorded in volatile memory (EEP-
ROM*), they a r e sto r ed in the memo ry even th ough
the bat
tery t e rminals are d i sconne cted.
NOTE: .
•*: EEPROM (E lectrical Erasable & Programma-
ble ROM) Special ty pe o f me mory that can b e
prog
rammed or erase d ele c trically .
•For each diag nostic item, refer to the Mainte-
nance Manua l.
SERV ICE DA T A OUTPUT
Usin g M. U. T . -II I , t h e i n p u t d a t a s e n t f r om t h e se ns ors
and motors can
be rea d .
NOTE: For e a ch service dat a it em, re fer to th e Ma in-
tenance Manual.