Mitsubishi Outlander (2013+). Manual - part 64

CONSTRUCTION DIAGRAM

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-9

ASC OPERATION DISPLAY AND LAMP,
ASC WARNING DISPLAY AND LAMP, ASC
OFF lamp

The ASC system illuminates or flashes the ASC
operation display and lamp, ASC warning display
and lamp or ASC OFF lamp in the following opera-
tion patterns, and informs the driver of the ASC sys-
tem status.

ASC operation display and lamp

• Flashes in 2 Hz (display)/4 Hz (lamp) during the

ASC control.

ASC warning display and lamp

• Turns ON when the system malfunction occurs.

ASC OFF lamp

• ASC-ECU detects the overheat of the brake

pads. When the brake TCL control is prohibited,
the ASC OFF lamp flashes in approximately 2
Hz.

ASC operation display and lamp, ASC warning display and lamp, ASC OFF lamp illumination and
flashing patterns

NOTE:

Illuminates if the TCL function or stability control function is defective when the HSA function is

defective. (HSA control prohibited)

ASC-ECU

M2357000100515

This ECU incorporates the ABS function, EBD func-
tion, HSA function, stability control function and TCL
function, brake assist control.

The hydraulic units of the ASC and TCL systems
employ the automatic pressurisation function. These
systems also incorporates G and yaw rate sensor
(integrated with ASC-ECU), steering wheel sensor,
and master cylinder pressure sensor (integrated with
hydraulic unit).

State

ASC operation
display and lamp

ASC warning display
and lamp

ASC OFF lamp

Normal

−

Stability control
operated

Flashing (display: 2
Hz, lamp: 4 Hz)

−

TCL operated

Flashing (display: 2
Hz, lamp: 4 Hz)

−

HSA operated

−

ASC is disabled
by ASC OFF
switch

ASC disabled

−

Illuminates

When the brake
pad
temperature is
high

ASC-ECU informs
the driver that the
brake TCL does
not function.

−

Flashing (2 Hz)

Abnormal

Stability control
malfunction

−

Illuminates

TCL malfunction

−

Illuminates

HSA malfunction

−

Illuminates

−

M.U.T.-III
connection

Actuator not
operated

−

Actuator operated

−

Illuminates

CONSTRUCTION DIAGRAM

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-10

STABILITY 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 brake 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 in
the vehicle.

Example of Stability Control function

The Stability Control manages the vehicle attitude by
creating a yaw moment from altering the balance
between the cornering force and each wheel's brak-
ing mechanism.

Example of the effect of control

AC604152AB

Large braking
force

AC604154AB

Suppression of rear wheel side slip

Suppression of front wheel side slip

Prevents spinning
caused by
rear wheel side slip

Prevents the vehicle
from getting out of course
by front wheel side slip

CONSTRUCTION DIAGRAM

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-11

For example, on a slippery surface, if the vehicle
tends to be under-steered contrary to the driver’s
intention, a yaw moment (a rotational moment) is
created to restrain the under-steering by increasing
the rear-inside braking force. On the other hand,
when the vehicle tends to be oversteered, a yaw

moment (a restorative moment) is created to restrain
the oversteering by increasing the front-outside
wheel braking force. Furthermore, when it is deter-
mined that the vehicle is over-speeding, safe and
stable cornering is enabled by deceleration from
reducing the engine output.

Joint control

ASC-ECU transmits data necessary for control of
ABS and TCL, performing joint control.

Example of TCL function

2WD

4WD

Control system

Control content

ABS

Even during ABS operation, ABS performance is improved from the joint
operation of the stability control.

TCL

During acceleration, engine output is governed through joint operation with
stability control.

AC705575AB

Slipping wheel

Brake force

Slippery surface

Direction of
driving

Driving
force

AC706148

Brake force

Driving
force

Direction of
driving

Slipping wheel

Slippery surface

Slipping wheel

Slippery surface

Driving
force

Brake force

CONSTRUCTION DIAGRAM

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-12

When the driving wheels slip on the slippery road
surface, TCL applies the brake automatically, sends
the signal requesting engine speed reduction to the
engine-ECU, and prevents the loss of the driving
force resulting from the slippage of the driving wheel.

Hill START ASSIST (HSA) FUNCTION

System configuration

When the vehicle has completely stopped on a steep
uphill by the service brake, ASC-ECU judges
whether or not start the HSA function control in
accordance with the signals (ETACS-ECU,
CVT-ECU, G & yaw rate sensor, brake fluid pressure
sensor, engine-ECU, wheel speed sensor).

ACB06022

gear position information

CVT-ECU

Parking brake switch

ETACS-ECU

engine related information

Engine-ECU

: Hardwire-line
: CAN line
: Brake-line

Wheel speed sensor

Combination meter

Hydraulic unit

ASC-ECU

Master cylinder
pressure sensor

G and yaw rate
sensor

HSA control

Brake fluid
currently
supplied to each
wheel cylinder
is controlled.

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