ESP MITSUBISHI COLT 2006 Service Owner's Manual

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

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.