Mitsubishi Outlander (2013+). Manual - part 167

ACTIVE STABILITY CONTROL SYSTEM (ASC)

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-20

When brake fluid pressure is increased by stability control (or increased by TCL)

The system closes the cut valve to block the pas-
sage from the pump outlet to the master cylinder, 
and opens the suction valve, connecting the passage 
from the master cylinder to the pump inlet. The brake 
fluid from the master cylinder is supplied to the wheel 
cylinder.

VALVE CONDITION

NOTE: 

*

 The inlet valve and the outlet valve close or 

open depending on driving conditions to control the 
brake fluid pressure at each wheel.

ACC00363AE

Low pressure
accumulator

Pump

Motor

Suction
damper

Damping
chamber

Brake fluid flow

Hydraulic unit

Outlet valve

Outlet valve

Inlet valve

Inlet valve

Suction valve

Cut valve

Pressure sensor

Master cylinder

Wheel
cylinder
(Rear)

Wheel
cylinder
(Front)

Item

Power status

Open/Close

Cut valve

ON

Closed

Suction valve

ON

Open

Inlet valve

*

OFF

Open

Outlet valve

*

OFF

Closed

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-21

When brake fluid pressure is held by stability control, TCL or HSA (Hill Start Assist) 
function

The system closes the cut valve, suction valve and 
outlet valve to hold the brake fluid pressure in the 
wheel cylinder.

VALVE CONDITION

NOTE: 

*

 The inlet valve and the outlet valve close or 

open depending on driving conditions to control the 
brake fluid pressure at each wheel.

ACC00363AF

Low pressure
accumulator

Pump

Motor

Suction
damper

Damping
chamber

Brake fluid flow

Hydraulic unit

Outlet valve

Outlet valve

Inlet valve

Inlet valve

Suction valve

Cut valve

Pressure sensor

Master cylinder

Wheel
cylinder
(Rear)

Wheel
cylinder
(Front)

Item

Power status

Open/Close

Cut valve

ON

Closed

Suction valve

OFF

Closed

Inlet valve

*

OFF

Open

Outlet valve

*

OFF

Closed

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-22

When brake fluid pressure is decreased by stability control (or decreased by TCL)

The system opens the outlet valve while closing the 
inlet valve to store the brake fluid filled in the wheel 
cylinder in the low pressure accumulator. The brake 
fluid stored in the low pressure accumulator returns 
to the master cylinder through the suction valve.

VALVE CONDITION

NOTE: 

*

 The inlet valve and the outlet valve close or 

open depending on driving conditions to control the 
brake fluid pressure at each wheel.

TCL OPERATION

ASC-ECU receives various kinds of information from 
the engine-ECU, 4WD-ECU, steering wheel sensor, 
G & yaw rate sensor, CVT-ECU, and wheel speed 
sensor. When ASC-ECU determines that the driving 
wheel is slipping, it suppresses the wheel slippage. 
At this time, ASC-ECU controls the brake fluid pres-

sure of the driving wheel determined to be slipping 
so that the torque is transferred to another driving 
wheel. Basically, the operations of ABS solenoid 
valve and ASC valve are the same. ASC-ECU, the 
engine-ECU, and CVT-ECU communicate with each 

ACC00363AG

Low pressure
accumulator

Pump

Motor

Suction
damper

Damping
chamber

Brake fluid flow

Hydraulic unit

Outlet valve

Outlet valve

Inlet valve

Inlet valve

Suction valve

Cut valve

Pressure sensor

Master cylinder

Wheel
cylinder
(Rear)

Wheel
cylinder
(Front)

Item

Power status

Open/Close

Cut valve

OFF

Open

Suction valve

OFF

Closed

Inlet valve

*

ON

Closed

Outlet valve

*

ON

Open

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-23

other via the CAN bus line. When the accelerator 
pedal is depressed too far, the signal requesting the 
engine speed reduction is sent to the engine-ECU. 
The ASC-ECU performs joint control with CVT-ECU 
and secures the TCL controllability.

HSA OPERATION

ASC-ECU receives various kinds of information from 
the engine ECU, G & yaw rate sensor, CVT-ECU, 
ETACS-ECU and wheel speed sensor. When the 
vehicle has been completely stopped on a slope by 
the service brake, the ASC-ECU activates the HSA. 
The HSA maintains the brake wheel cylinder pres-

sure by closing the cut valve to prevent the vehicle 
from sliding down the slope when the brake pedal is 
released at startup. It also adjusts the brake wheel 
cylinder pressure depending on the engine torque to 
prevent the vehicle from moving backward during 
startup.

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