Subaru LEGACY 2003 Service Manual page 278

VDC (DIAGNOSTICS)
Symptom
Vibration and/or Excessive
noise brake pedal
• During abrupt vibration
braking
• During rapid
Noise from
acceleration
VDCH/U
• During slip-
pery road driv-
ing
Noise from front
of vehicle
Noise inside
passenger
compartment
Noise from rear
of vehicle
Engine does not accelerate or
engine stalls during rapid acceler-
ation or on slippery roads.
GENERAL DIAGNOSTIC TABLE
Primary probable cause
Uneven road
Incorrect wiring or piping
VDCH/U (mount bushing)
Faulty ABS sensor or sensor gap
Brake pipe
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)
Faulty ABS sensor or sensor gap
Brake caliper
Brake pads
Disc rotor
Parking brake
Brake pipe
Suspension play or fatigue (reduced
damping)
VDCH/U
VDCCM
Faulty ABS sensor or sensor gap
Master cylinder
Brake caliper
Parking brake
Incorrect wiring or piping
VDC-276
Secondary probable cause
VDCH/U
Proportioning valve
Brake booster
Suspension play or fatigue (reduced damping)
VDCCM
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Axle & wheels
Tire specifications, wear and pressures
VDCCM
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Axle & wheels
Tire specifications, wear and pressures
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Brake pads
Brake pipe