Subaru Legacy 2004 Service Manual page 3206

Symptom
Vibration or Excessive
noise brake pedal
• When brak- vibration
ing suddenly
Strange noise
• When accel-
from VDCH/U
erating sud-
denly
• While driving
on a slippery
Noise from the
road
front side of
vehicle
Noise inside
passenger seat
Noise from the
rear side of
vehicle
Engine does not accelerate or
goes into a stall when accelerat-
ing suddenly or driving on a slip-
pery surface.
General Diagnostic Table
Main probable cause
• Road surface (uneven)
• Incorrect wiring or piping connections
• VDCCM&H/U (mount bushing)
• Defective ABS wheel speed sensor or
sensor gap
• Brake pipe
• VDCCM&H/U (mount bushing)
• Defective ABS wheel speed sensor or
sensor gap
• Master cylinder
• Brake caliper
• Brake pad
• Disc rotor
• Brake pipe
• Brake booster
• Suspension play or fatigue (poor damp-
ing)
• Defective ABS wheel speed sensor or
sensor gap
• Brake caliper
• Brake pad
• Disc rotor
• Parking brake
• Brake pipe
• Suspension play or fatigue (poor damp-
ing)
• VDCCM&H/U
• Defective ABS wheel speed sensor or
sensor gap
• Master cylinder
• Brake caliper
• Parking brake
• Incorrect wiring or piping
VDC(diag)-133
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
• VDCCM&H/U
• Brake booster
• Suspension play or fatigue (poor damping)
• VDCCM&H/U
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & lateral G sensor or
improper installation
• Axle and wheels
• Tire specifications, tire wear and air pressures
• VDCCM&H/U
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & lateral G sensor or
improper installation
• Axle and wheels
• Tire specifications, tire wear and air pressures
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & lateral G sensor or
improper installation
• Brake pad
• Brake pipe
Other probable cause