2006 MITSUBISHI COLT ABS

CONSTRUCTION DIAGRAM
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-7
ASC-ECU
M2357000100043
ABS-ECU and ASC-ECU are integrated in this ECU.
SYSTEM CONFIGURATION
The hydraulic unit of the ASC system employs the
automatic pressurisation function for stability and
TCL control. The system also incorporates G and
yaw rate sensor, steering wheel sensor, and pres
-
sure sensor (integrated with hydraulic unit).
CONTROL DESCRIPTION
ASC-ECU detects vehicle movement based on infor-
mation from various sensors and calculates a model
of ideal vehicle movement. ASC-ECU compares the
actual vehicle movement with the ideal vehicle
model, and manages the brak e of the specific wheel
so that the actual vehicle movement gets close to the
ideal vehicle mode. It also controls the understeer or
oversteer condition by creating the yaw moment
(rotating direction force) in the vehicle.
Stability control
The stability control manages the vehicle attitude by
creating a yaw moment (rotating direction force) from
altering the balance between the cornering force and
each wheel’s braking mechanism.
Example of stability control operation
AC313359AB
Creating a rotational moment Creating a restorative moment
Braking force
increase
Braking force
increase
For example, on a slippe ry surface, if t he ve hicle
tends to be
under-steered con t rary t o the d r ive r ’ s
inten
t ion, a yaw mome nt (a ro t a tional mo ment) is
create
d to re strain the u nder-steering by increasing
the rear
-inside b r aking force. On the other ha nd,
whe
n the vehicle tends to b e ove r stee red, a yaw moment (a re storat ive moment) is crea ted to re strain
the overst eering by incre a sing the front-ou t side
wh eel b r aking force. Furt hermo re, when it is dete r
-
mined tha t the vehicle is o v er-speeding, safe a nd
st
able corn ering is e nabled by decelerat ion f r om
reducing t
he eng ine o u tput.

CONSTRUCTION DIAGRAM
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-8
EXAMPLE OF THE EFFECT OF CONTROL
AC204504
AC204505
AC204506AC204507AB
Restraining under-steering Restraining over-steering
Avoiding under-steering Avoiding wheel spin
Improving ABS performance
Stable vehicle attitude
after avoiding obstacles
Example of TCL control
When th e driving wheel slip s (ex. during drivin g on
low
µ road), TCL send s the engine out put red u ction
sign
al to the en gine ECU in order to prevent th e driv
-
ing f o r c e loss cau s e d by t he dr iving whe e l slip . A t t h e
same time, TCL a
pplies th e brake to t he slipp i ng
driving whe
e l so that the drivin g force is applied to
t
he non-slipping driving wheel, which co ntrols the slip
o
f th e drivi ng wheel, securin g the prop er d r iving f o rce
and increa
sed steering fo rce.
Fail-safe and diagnostic functions
ASC-ECU constantly mo nitors the input and ou tput
sign
als. If an error is det ected in th e syste m ,
ASC-ECU send
s a f a il sign al a nd the correspond ing
indicato
r lamp is illuminate d or blinks. V a riou s con
-
trols are proc essed depen ding on the cause of mal-
functi on a s shown below . ASC-ECU has the
follo
wing fu nctions for easier system checks.
•Diagnosis code set
•Service dat a outp u t
•Actuator te st
All the above it ems can be diagnosed using
M.U.T
. -III.

CONSTRUCTION DIAGRAM
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-9
FAIL-SAFE FUNCTION
Diagnosis
code No.ItemABSEBDTCLASC
Engine
controlBrake
controlEngine
controlBrake
control
C1200Wheel speed sensor (FR)
system (open circuit or
short to earth or power
supply)ProhibitedEnabled
(Prohibited
when three
or more
wheels
have fault.)ProhibitedProhibitedProhibitedProhibited
C1205Wheel speed sensor (FL)
system (open circuit or
short to earth or power
supply)
C1210Wheel speed sensor (RR)
system (open circuit or
short to earth or power
supply)
C1215Wheel speed sensor (RL)
system (open circuit or
short to earth or power
supply)
C1201Wheel speed sensor (FR)
system (sensor output
error)ProhibitedEnabled
(Prohibited
when three
or more
wheels
have fault.)ProhibitedProhibitedProhibitedProhibited
C1206Wheel speed sensor (FL)
system (sensor output
error)
C1211Wheel speed sensor (RR)
system (sensor output
error)
C1216Wheel speed sensor (RL)
system (sensor output
error)
C1222Wheel sensor system
(abnormal power supply
voltage)ProhibitedEnabled
(Prohibited
when three
or more
wheels
have fault.)ProhibitedProhibitedProhibitedProhibited
C1225Wheel speed sensor
system (sensor output
error)ProhibitedProhibitedProhibitedProhibitedProhibitedProhibited

CONSTRUCTION DIAGRAM
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-10
C1226Control solenoid valve
(FR) pressure holding
systemProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1231Control solenoid valve
(FR) decompressing
system
C1236Control solenoid valve
(FL) pressure holding
system
C1241Control solenoid valve
(FL) pressure reducing
system
C1246Control solenoid valve
(RR) pressure holding
system
C1251Control solenoid valve
(RR) pressure reducing
system
C1256Control solenoid valve
(RL) pressure holding
system
C1261Control solenoid valve
(RL) decompressing
system
C1266Motor system (seizure)ProhibitedBack-up
controlProhibitedProhibitedProhibitedProhibited
C1273Motor relay stuck OFF
C1274Motor relay stuck ON
C1276Valve relay systemEnabledEnabledEnabledEnabledProhibitedProhibited
C1278Valve relay system stuck
offEnabledEnabledEnabledEnabledProhibitedProhibited
C1279Valve relay system stuck
onProhibitedEnabledProhibitedProhibitedProhibitedProhibited
C1300Cut valve (FR/RL)
systemProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1305Suction valve (FR/RL)
system
C1310Cut valve (FL/RR)
system
C1315Suction valve (FL/RR)
system
C1340Stop lamp switch signal
errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
C1345Low brake fluid levelEnabledEnabledEnabledEnabledEnabledEnabled
C1364Internal malfunction of
pressure sensorProhibitedEnabledProhibitedProhibitedProhibitedProhibited
C1366Lateral G-sensor signal
errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
Diagnosis
code No.Item ABS EBD TCL ASC
Engine
controlBrake
controlEngine
controlBrake
control

CONSTRUCTION DIAGRAM
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-11
C1371Yaw rate sensor signal
errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
C1385Yaw rate sensor error
C1387Lateral G-sensor errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
C1388Yaw rate sensor active
check errorEnabledEnabledProhibitedProhibitedProhibitedEnabled
C1394Steering wheel sensor
neutral point not learnedEnabledEnabledProhibitedProhibitedProhibitedProhibited
C1396Engine torque
intervention rejectionEnabledEnabledProhibitedProhibitedProhibitedProhibited
C1505Steering wheel sensor
malfunction (detection at
the ASC-ECU side)EnabledEnabledProhibitedProhibitedProhibitedProhibited
C1555Range exceeding of
steering wheel sensor
C1607Malfunction of ASC-ECUProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
ASC-ECU malfunction
(CAN communication
circuit failure)EnabledEnabledProhibitedProhibitedProhibitedProhibited
C1621G and yaw rate sensor
improper installationEnabledEnabledProhibitedProhibitedProhibitedProhibited
C1860Abnormal rise of
ASC-ECU power supply
voltageProhibitedProhibitedProhibitedProhibitedProhibitedProhibited
C1861Abnormal drop of
ASC-ECU power supply
voltageProhibitedEnabledProhibitedProhibitedProhibitedProhibited
C1862Abnormal power supply
voltage of G and yaw rate
sensor (high voltage)EnabledEnabledProhibitedProhibitedProhibitedProhibited
C1863Abnormal power supply
voltage of G and yaw rate
sensor (low voltage)
U1073Bus-offEnabledEnabledProhibitedProhibitedProhibitedProhibited
U1100Engine-related CAN
time-out errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
U1104Steering wheel sensor
CAN time-out errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
U1105G and yaw rate sensor
CAN time-out errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
U1406Accelerator pedal position
signal errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
U1426Engine speed signal errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
U1427Engine torque signal errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
Diagnosis
code No.Item ABS EBD TCL ASC
Engine
controlBrake
controlEngine
controlBrake
control

CONSTRUCTION DIAGRAM
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-12
Indicator lamp
U1428Engine's maximum torque
signal errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
U1429Engine's minimum torque
signal errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
U1430Engine torque request
signal errorEnabledEnabledProhibitedProhibitedProhibitedProhibited
Diagnosis
code No.Item ABS EBD TCL ASC
Engine
controlBrake
controlEngine
controlBrake
control
Diagnosis
code No.ItemBrake warning
lampABS warning lampActive stability
control system
(ASC) indicator
lamp ASC OFF indicator
lamp
C1200Wheel speed sensor
(FR) system (open or
short to earth or power
supply)Illuminates when
three wheels or
more are
abnormal.IlluminatesIlluminatesIlluminates
C1205Wheel speed sensor
(FL) system (open or
short to earth or power
supply)
C1210Wheel speed sensor
(RR) system (open or
short to earth or power
supply)
C1215Wheel speed sensor
(RL) system (open or
short to earth or power
supply)
C1201Wheel speed sensor
(FR) system (sensor
transmitting error)Illuminates when
three wheels or
more are
abnormal.IlluminatesIlluminatesIlluminates
C1206Wheel speed sensor
(FL) system (sensor
transmitting error)
C1211Wheel speed sensor
(RR) system (sensor
transmitting error)
C1216Wheel speed sensor
(RL) system (sensor
transmitting error)
C1222Wheel sensor system
(abnormal power
supply voltage)IlluminateIlluminateIlluminateIlluminate
C1225Wheel speed sensor
malfunctionIlluminatesIlluminatesIlluminatesIlluminates

CONSTRUCTION DIAGRAM
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-13
C1226Control solenoid valve
(FR) pressure holding
systemIlluminatesIlluminatesIlluminatesIlluminates
C1231Control solenoid valve
(FR) decompressing
system
C1236Control solenoid valve
(FL) pressure holding
system
C1241Control solenoid valve
(FL) pressure reducing
system
C1246Control solenoid valve
(RR) pressure holding
system
C1251Control solenoid valve
(RR) pressure
reducing system
C1256Control solenoid valve
(RL) pressure holding
system
C1261Control solenoid valve
(RL) decompressing
system
C1266Pump motor rotation
malfunction OffIlluminatesIlluminatesIlluminates
C1273Pump motor drive
circuit malfunction
C1274Pump motor drive
circuit stuck on
C1276Valve relay systemIlluminatesIlluminatesIlluminatesIlluminates
C1278Valve relay stuck off
C1279Valve relay stuck on IlluminatesIlluminatesIlluminatesIlluminates
C1300Front-right cut valve
(Primary)IlluminatesIlluminatesIlluminatesIlluminates
C1305Front-right suction
valve (Primary)
C1310Front-left cut valve
(secondly)
C1315Front-left suction valve
(secondly)
C1340Abnormal stop lamp
switch signalOffIlluminatesIlluminatesIlluminates
C1345Low brake fluid levelIlluminatesOffOffOff
Diagnosis
code No.Item Brake warning
lampABS warning lamp Active stability
control system
(ASC) indicator
lamp ASC OFF indicator
lamp

CONSTRUCTION DIAGRAM
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-14
C1364Brake fluid Pressure
sensor malfunctionOffIlluminatesIlluminatesIlluminates
C1366Lateral G sensor signal
malfunctionOffOffIlluminatesIlluminates
C1371Yaw rate sensor signal
malfunctionOffOffIlluminatesIlluminates
C1385Yaw rate sensor
malfunction
C1387Lateral G-sensor
malfunctionOffOffIlluminatesIlluminates
C1388Yaw rate sensor active
check error
C1394Steering wheel sensor
neutral point not
learnedOffOffIlluminatesIlluminates
C1396Active stability control
system control
temporarily disabled
(engine torque request
rejected)OffOffIlluminatesIlluminates
C1505Steering wheel sensor
abnormality (detected
at ABS/active stability
control
system-ECU-side)OffOffIlluminatesIlluminates
C1555Output error in steering
wheel sensor
C1607Defective active
stability control
system-ECUIlluminatesIlluminatesIlluminatesIlluminates
C1621G and yaw rate sensor
improper installationOffOffIlluminateIlluminate
C1860ABS/Active stability
control system-ECU
power supply voltage
malfunction (high
voltage) IlluminatesIlluminatesIlluminatesIlluminates
C1861ABS/Active stability
control system-ECU
power supply voltage
malfunction (low
voltage) IlluminatesIlluminatesIlluminatesIlluminates
C1862G and yaw rate sensor
power supply voltage
malfunction (high
voltage) OffOffIlluminatesIlluminates
Diagnosis
code No.Item Brake warning
lampABS warning lamp Active stability
control system
(ASC) indicator
lamp ASC OFF indicator
lamp