2006 MITSUBISHI COLT steering

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.

ELECTRICAL POWER STEERING
POWER STEERING37-11
OPERATION
M2370000700110
IGNITION SWITCH ON
Ignition supply voltage is applied to the electric
power steering-ECU, and the ECU enters standby
mode.
IGNITION SWITCH ON
AC601668AC207635 AB
Electric power
steering-ECU
OFF
OFF MotorMotor current signal
Maximum limit value (50A)
Engine speed
Engine speed
ON
500 r/min or 15 km/h
max 0.5s 0.7s
Motor output Determination of motor
control start Temporary increase of motor
assist limit value
Engine-CVT-ECU or
engine-ECU
1.
Whe n th e e ngine is st arted, the en gine sp eed sig-
nal sent from the en gine -CVT -ECU or
eng
ine-ECU is inp u t to th e ele c tric power steer
-
ing-ECU.
2. Af ter st a r ting the engine, the electric power ste e r-
ing-ECU judges the engin e st atu s "ENGINE
SPEED ON"
when the engine speed reaches 500
r/min or
the vehicle speed reaches 1 5 km/h or
more, the
n the p o wer assist functio n is ready .
STEERING WHEEL OPERAT ION
AC400096
AC206443AB
Electric power
steering-ECU
Torque
sensor
Torque sensor
Motor Motor
Motor current
Torque sensor signal (main)
Torque sensor signal (sub)
F A IL- S AFE FUNCTION OPERA T ION
Duri ng t h e f a il -s af e m o d e , t h e el ect r ic powe r st ee rin g
operate
s as a manual ste e ring system.

SYSTEM CONSTRUCTION
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)52B-10
SYSTEM CONSTRUCTION
DRIVER'S SIDE AIR BAG MODULEM2521002000216
Refer to GROUP 37, Steering wheel P.37-5.
PASSENGER'S (FRONT) AIR BAG MODULE
M2521003000349
AC206612
AC206613
AC207778
AE
A
A
Section A - A
Passenger's (front)
air bag module
Air bag
Inflator
Passeng er ’ s (f ron t ) air ba g mo du le co nsist s o f t h e a i r
bag, inflat
or , and fixing b r acket s .
The air bag is made of nylon an d inf l ated by th e gas
supp
lied from the in flato r . As th e driver ’ s b ody sin ks
into t
he in flated air b ag, the air b ag deflates while dis
-
chargi ng th e gas from two side vent s to abso r b the
imp
a ct.
SIDE-AIRBAG M O DULE
M25210040 0022 3
The sid e -airbag mo dule structure is the sa me as that
for 200
1 P A JERO.

ComponentNo.Function
SensorWheel speed sensor1Sends alternating current signals at frequencies which are
proportional to the rotation speeds of each wheel to the
active stability control system-ECU
Magnetic encoder for wheel
speed detection2The wheel speed sensor is a pulse generator. When the
magnetic encoder for wheel speed detection (a plate on
which north and south pole sides of the magnets are
arranged alternately) rotates, it outputs frequency pulse
signal in proportion to each wheel speed.
Stop lamp switch3Sends a signal to the active stability control system-ECU
to indicate whether the brake pedal is depressed or not.
Parking brake switch4Outputs the signal indicating whether the parking brake
lever is pulled or not to ASC-ECU.
Brake fluid level switch5Outputs the signal indicating whether the brake fluid is
filled to the lowest limit level or not to ASC-ECU.
G and yaw rate sensor6Detects the lateral acceleration and the yaw rate for the
vehicle. Then it sends a signal through the CAN bus line to
the active stability control system-ECU.
Steering wheel sensor7Detects the steering wheel angle, and sends a signal to
the active stability control system-ECU through the CAN
bus line.
ASC OFF switch8Outputs the ASC ON/OFF signal to ASC-ECU.
Pressure sensor9Is incorporated in the hydraulic unit, and informs the active
stability control system-ECU of the brake fluid pressure in
the master cylinder.
ActuatorHydraulic unit10Drives the solenoid valves and pump motor according to
signals from the ABS/active stability control system-ECU in
order to control the brake hydraulic pressure for each wheel.
ABS warning lamp11Illuminates in response to signals from the active stability
control system-ECU when a problem develops in the
system.
Brake warning lamp12Illuminates in response to signals from the active stability
control system-ECU when a problem develops in the EBD
system or the brake fluid level is low.
Active stability control system
(ASC) indicator lamp 13Receives a signal from the active stability control
system-ECU, and flashes to inform the driver that the
system is operating, or illuminates to inform the driver of
system shutdown.
ASC OFF indicator lamp14Informs the driver of the ASC shutdown by illuminating
with the signal from ASC-ECU.
Diagnosis connector15Sets the diagnosis codes and allows communication with
the M.U.T.-III.
Engine-ECU16Receives a signal from the active stability control
system-ECU to control the engine output.
Anti-skid Brake/Active Stability Control
System control unit (ABS/active stability
control system-ECU)17Controls actuators (described above) based on the signals
coming from each sensor.
Controls the self-diagnostics and fail-safe functions.
Controls the diagnostic function (M.U.T.-III compatible).
GENERAL
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-3

GENERAL
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-4
SCHEMATIC DIAGRAM
AC600637AC
Combination meter
ABS warning lamp 
· Brake warning lamp
· Active stability control indicator lamp
· Active stability control OFF indicator lamp
Diagnosis
Connector
Control solenoid valve (FR) OUT
Control solenoid valve (FR) IN
Control solenoid valve (FL) OUT
Control solenoid valve (FL) IN
Control solenoid valve (RR) OUT
Control solenoid valve (RR) IN
Control solenoid valve (RL) OUT
Control solenoid valve (RL) IN Suction valve (FR)
Suction valve (FL)
Cut valve (FR)
Cut valve (FL) Pump motor
Active stability
control system-ECU
Front-left wheel speed sensor
Rear-left wheel speed sensor
Front-right wheel speed sensor Rear-right wheel speed sensor
Master cylinder pressure sensor Stop lamp switch
Parking brake switch
Brake fluid level switch
Power supply to active stability
control system-ECU Steering wheel sensor
G and yaw rate sensor
Engine-ECU
Steering wheel sensor
Front-right wheel (FR)
Wheel
speed
sensor
Engine-ECU
G and yaw rate sensor
Parking
brake
switch Rear-right wheel (RR)
Wheel
speed
sensor
Stop lamp switch
Hydraulic
unit Wheel speed
sensor Rear-left
wheel (RL)
Wheel speed
sensor
Front-left wheel (FL)
Note
: CAN-bus line

CONSTRUCTION DIAGRAM
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-5
CONSTRUCTION DIAGRAM
SENSORM2357000300036
G AND YAW RATE SENSOR
AC600804ACG and yaw rate sensor
Parking brake lever
This sens or , inst alled u nder th e ce ntre conso l e,
detect
s the yaw rate a nd lateral accelera tion of the
vehicle
.
STEERING WHEEL SENSOR
AC600803ACSteering wheel sensor
This sens or , a t t a ched to the column switch, det ect s
the rot
a tional angle of the stee ring whe e l.
ASC OFF SWITCH
AC600923ABASC OFF switch
Th is swit ch is at t a che d on the inst rument p a nel to the
right side
of the driver's seat. The ASC system ca n
be turn
ed OFF by pressing this ASC OFF switch for
3 seconds when t
he ig nition switch is ON. By pre s s
-
ing the switch a gain, the system can be turned ON.
NOTE: .
•Whe n the ASC syste m is turn ed OFF , the ASC
OFF ind
i ca tor illuminat es.
•If the ASC OFF switch is presse d for 15 se cond s
or
more , the ope ratio nal error prevention function
activates, and th
e ASC system can not be turned
OFF until the
ign i tion switch is turn ed to t he ON
position ag
ain.
ASC OFF switch ope ra tion and system operation
ASC OFF switch controlTCL functionStability control function
ON (ASC OFF indicator goes out.)EnabledEnabled
OFF (ASC OFF indicator
illuminates.)ProhibitedProhibited
NOTE: The ASC function st a r t s the co ntrol when t he
vehicle
spe ed is 10 km/h or mo re.