Subaru Legacy (2005 year). Service manual - part 817
VDC(diag)-133
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
General Diagnostic Table
Vibration or
noise
• When brak-
ing suddenly
• When accel-
erating sud-
denly
• While driving
on a slippery
road
Excessive
brake pedal
vibration
• Road surface (uneven)
• Incorrect wiring or piping connections
• VDCCM&H/U
• Brake booster
• Suspension play or fatigue (poor damping)
Noise from
VDCCM&H/U
• VDCCM&H/U (mount bushing)
• Defective ABS wheel speed sensor or
sensor gap
• Brake pipe
• VDCCM&H/U
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & lateral G sensor or
improper installation
Noise from the
front side of
vehicle
• 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)
• Axle and wheels
• Tire specifications, tire wear and air pressures
Noise inside
passenger seat
• VDCCM&H/U
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & lateral G sensor or
improper installation
Noise from the
rear side of
vehicle
• 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)
• Axle and wheels
• Tire specifications, tire wear and air pressures
Engine does not accelerate or
goes into a stall when accelerat-
ing suddenly or driving on a slip-
pery surface.
• VDCCM&H/U
• Defective ABS wheel speed sensor or
sensor gap
• Master cylinder
• Brake caliper
• Parking brake
• Incorrect wiring or piping
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & lateral G sensor or
improper installation
• Brake pad
• Brake pipe
Symptom
Main probable cause
Other probable cause