Subaru LEGACY 2003 Service Manual page 279

Symptom
Poor TCS's Deviation in
directional either left or
operation stabil- right direction
ity
Vehicle spin
Steering wheel drags during oper-
ation.
VDC activates during ordinary
driving.
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.
GENERAL DIAGNOSTIC TABLE
Primary probable cause
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
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
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
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
Harness
Indicator light bulb
VDC OFF switch
VDC-277
VDC (DIAGNOSTICS)
Secondary probable cause
Proportioning valve
Disc rotor
Brake pipe
Axle & wheels
Suspension play or fatigue (reduced damping)
Proportioning valve
Brake caliper
Brake pipe
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