DESCRIPTION OF CONSTRUCTION AND OPERATION
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-17
DESCRIPTION OF CONSTRUCTION AND OPERATION
M2357000600037
Stability control operation
•ASC-ECU receives various kinds of information 
from the wheel speed sensor, steering wheel 
sensor, G and yaw rate sensor, pressure sensor, 
stop lamp switch, brake fluid level switch, parking 
brake switch, and engine ECU. When ECU deter
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mines the vehicle runs in the oversteer or unders-
teer direction based on the signal sent from these 
sensors, ASC-ECU drives each valve and pump 
motor and controls the braking force to be applied 
to the wheels.
•When the system increases the fluid pressure 
automatically, it closes the cut valve to shut off 
the pressure line to the suction valve, and drives 
the pump motor. For example, when the vehicle 
runs in the oversteer direction while turning to the 
right, ASC-ECU supplies the brake fluid from the 
pump to the front left wheel in order to apply the 
braking force on it.
•ASC-ECU and the engine ECU communicate 
with each other via CAN communication. When 
the accelerator pedal is depressed too far, the 
signal requesting the engine output reduction is 
sent to the engine ECU so that the ASC controlla
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bility can be secured.