Subaru Legacy III (2000-2003 year). 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

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