Subaru LEGACY 2002 Quick Reference Index page 403

VEHICLE DYNAMICS CONTROL (VDC) SYSTEM
D: SYSTEM COMPONENTS AND FUNCTIONS
VDCCM
VDC Hydraulic Control
Unit (VDCH/U)
Steering angle sensor
Yaw-rate and lateral G
sensor
Pressure sensor
ABS sensor (wheel
speed sensor)
Tone wheel
Engine Control Module
(ECM)
Automatic transmission
control module
ABS warning light
VDC warning light
VDC operating indicator
light
VDC OFF indicator light Illuminates to tell the driver that the VDC and TCS are inactive (not due to a system failure).
VDC OFF switch
NOTE:
CAN (Controller Area Network) communication refers to bidirectional multiplex high-speed com-
munication.
Determines the vehicle's running condition from various sensor signals and, based on the result,
!
controls the VDC hydraulic control unit, ABS and TCS as required.
! Performs CAN communication with the automatic transmission control module and the steering an-
gle sensor.
! Causes the system to stop and the warning light to illuminate if a fault occurs in a circuit of the elec-
trical system. Stores the code that indicates the location of the fault.
Actuates the pump motor in response to a command from the VDCCM and changes fluid passages
using solenoid valves to control the hydraulic pressures applied to the wheel cylinders.
Detects the steering direction and angle when the steering wheel is operated by the driver and outputs
signals corresponding to them to the VDCCM.
Detects the yaw-rate and lateral G of the vehicle and outputs it to the VDCCM.
Detects the hydraulic pressure resulting from driver's brake pedal operation and outputs it to the VDC-
CM.
Detects the speed of each wheel and outputs it to the VDCCM.
Causes changes in magnetic flux density as its teeth move to enable the ABS sensor to detect the
wheel speed.
Controls the engine output in response to commands from the VDCCM. Further, it transmits current
engine output and engine speed signals to the VDCCM.
Controls the transfer clutch in response to commands from the VDCCM during VDC control, ABS con-
trol or TCS control so that torque is distributed optimally between the front and rear axles.
Alerts the driver to an ABS fault.
Alerts the driver to a VDC or TCS fault.
Blinks when the VDC is operating or lights steadily when the TCS is operating.
! Allows the driver to temporarily disengage VDC control.
! In "temporarily disengaged" status, the VDC OFF indicator light illuminates.
VDC-5
VDC