Subaru Legacy III (2000-2003 year). Service manual — part 810
VDC-276
VDC (DIAGNOSTICS)
GENERAL DIAGNOSTIC TABLE
Vibration and/or
noise
• During abrupt
braking
• During rapid
acceleration
• During slip-
pery road driv-
ing
Excessive
brake pedal
vibration
Uneven road
Incorrect wiring or piping
VDCH/U
Proportioning valve
Brake booster
Suspension play or fatigue (reduced damping)
Noise from
VDCH/U
VDCH/U (mount bushing)
Faulty ABS sensor or sensor gap
Brake pipe
VDCCM
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Noise from front
of vehicle
VDCH/U (mount bushing)
Faulty ABS sensor or sensor gap
Master cylinder
Brake caliper
Brake pads
Disc rotor
Brake pipe
Brake booster
Suspension play or fatigue (reduced
damping)
Axle & wheels
Tire specifications, wear and pressures
Noise inside
passenger
compartment
VDCCM
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Noise from rear
of vehicle
Faulty ABS sensor or sensor gap
Brake caliper
Brake pads
Disc rotor
Parking brake
Brake pipe
Suspension play or fatigue (reduced
damping)
Axle & wheels
Tire specifications, wear and pressures
Engine does not accelerate or
engine stalls during rapid acceler-
ation or on slippery roads.
VDCH/U
VDCCM
Faulty ABS sensor or sensor gap
Master cylinder
Brake caliper
Parking brake
Incorrect wiring or piping
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Brake pads
Brake pipe
Symptom
Primary probable cause
Secondary probable cause
VDC-277
VDC (DIAGNOSTICS)
GENERAL DIAGNOSTIC TABLE
Poor TCS's
directional
operation stabil-
ity
Deviation in
either left or
right direction
VDCH/U
VDCCM
Faulty ABS sensor or sensor gap
Faulty steering angle sensor or improper
neutral position
Faulty yaw rate and lateral G sensor or
improper installation
Brake caliper
Brake pads
Wheel alignment
Uneven road
Crowned road or banked road
Tire specifications, wear and pressures
Incorrect wiring or piping
Proportioning valve
Disc rotor
Brake pipe
Axle & wheels
Suspension play or fatigue (reduced damping)
Vehicle spin
VDCH/U
VDCCM
Faulty ABS sensor or sensor gap
Faulty steering angle sensor or improper
neutral position
Faulty yaw rate and lateral G sensor or
improper installation
Brake pads
Tire specifications, wear and pressures
Incorrect wiring or piping
Proportioning valve
Brake caliper
Brake pipe
Steering wheel drags during oper-
ation.
VDCH/U
VDCCM
Faulty ABS sensor or sensor gap
Faulty steering angle sensor or improper
neutral position
Faulty yaw rate and lateral G sensor or
improper installation
Incorrect wiring or piping connections
Power steering system
Brake caliper
Brake pads
Disc rotor
Wheel alignment
Uneven road
Crowned road or banked road
Suspension play or fatigue (reduced damping)
Tire specifications, wear and pressures
VDC activates during ordinary
driving.
VDCH/U
VDCCM
Faulty ABS sensor or sensor gap
Faulty steering angle sensor or improper
neutral position
Faulty yaw rate and lateral G sensor or
improper installation
Wheel alignment
Uneven road
Crowned road or banked road
Suspension play or fatigue (reduced
damping)
Tire specifications, wear and pressures
Incorrect wiring or piping
Power steering system
VDC OFF indicator light does not
illuminate when VDC OFF switch
is pushed.
NOTE:
When pushing the VDC OFF
switch for 10 seconds or more
while revving the engine, the VDC
OFF indicator light goes off and
operations cannot be continued.
Turn ignition switch from OFF to
ON again to recover the previous
condition.
Harness
Indicator light bulb
VDC OFF switch
Symptom
Primary probable cause
Secondary probable cause
VDC-278
VDC (DIAGNOSTICS)
GENERAL DIAGNOSTIC TABLE
MEMO:
BRAKE
BR
Page
General Description . . . . . . . . . . . . . . . . . . . . . 2
Front Brake Pad . . . . . . . . . . . . . . . . . . . . . . 20
Front Disc Rotor . . . . . . . . . . . . . . . . . . . . . . 22
Front Disc Brake Assembly . . . . . . . . . . . . . . . . . ...23
Rear Brake Pad. . . . . . . . . . . . . . . . . . . . . . .26
Rear Disc Rotor. . . . . . . . . . . . . . . . . . . . . . .27
Rear Disc Brake Assembly . . . . . . . . . . . . . . . . . ...29
Master Cylinder . . . . . . . . . . . . . . . . . . . . . . .32
Brake Booster . . . . . . . . . . . . . . . . . . . . . . ...34
Proportioning Valve. . . . . . . . . . . . . . . . . . . . ...39
Brake Fluid . . . . . . . . . . . . . . . . . . . . . . . . 40
Air Bleeding. . . . . . . . . . . . . . . . . . . . . . . ...42
Brake Hose . . . . . . . . . . . . . . . . . . . . . . . ...44
Brake Pipe. . . . . . . . . . . . . . . . . . . . . . . . .46
Hill Holder. . . . . . . . . . . . . . . . . . . . . . . . ..47
Brake Pedal. . . . . . . . . . . . . . . . . . . . . . . ...50
Stop Light Switch . . . . . . . . . . . . . . . . . . . . . ..55
General Diagnostics . . . . . . . . . . . . . . . . . . . . ..57
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