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Home >> Subaru >> 2004 >> Baja Base, Automatic >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Anti-Lock Brake Control System - Vehicle Dynamics Control (VDC) - Mechanism & Function >> Vehicle Dynamics Control (VDC) System >> System Components And Functions
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System Components And Functions

SYSTEM COMPONENTS AND FUNCTIONS

VDCCM
  • Determines the vehicles running condition from various sensor signals and, based on the result, controls the VDC hydraulic unit, ABS and TCS as required.
  • Performs CAN communication with the automatic transmission control module and the steering angle sensor.
  • Causes the system to stop and the warning light to illuminate if a fault occurs in a circuit of the electrical system. Stores the code that indicates the location of the fault.
VDC hydraulic unit (VDCH/U) 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.
Steering angle sensor Detects the steering direction and angle when the steering wheel is operated by the driver and outputs signals corresponding to them to the VDCCM.
Yaw-rate and lateral G sensor Detects the yaw-rate and lateral G of the vehicle and outputs it to the VDCCM.
Pressure sensor Detects the hydraulic pressure resulting from driver's brake pedal operation and outputs it to the VDCCM.
ABS sensor (wheel speed sensor) Detects the speed of each wheel and outputs it to the VDCCM.
Tone wheels Causes changes in magnetic flux density as its teeth move to enable the ABS sensor to detect the wheel speed.
Engine control module (ECM) Controls the engine output in response to commands from the VDCCM. Further, it transmits current engine output and engine speed signals to the VDCCM.
Automatic transmission control module Controls the transfer clutch in response to commands from the VDCCM during VDC control, ABS control or TCS control so that torque is distributed optimally between the front and rear axles.
ABS warning light It alerts the driver to an ABS fault.
VDC warning light Alerts the driver to a VDC or TCS fault.
VDC operation indicator light Blinks when the VDC is operating or lights steadily when the TCS is operating.
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
  • Allows the driver to temporarily disengage VDC control.
  • In "temporarily disengaged" status, the VDC OFF indicator light illuminates.
NOTE: CAN (Controller Area Network) communication refers to bidirectional multiplex high-speed communication.
Fig 1: Identifying System Components & Functions Circuit Diagram
G03321974Courtesy of SUBARU OF AMERICA, INC.
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