Tire Pressure Monitoring System (Tpms) (If Equipped) - Subaru 2011 Legacy Owner's Manual

11-34
Maintenance and service
or icy roads, we strongly recommend the
use of winter (snow) tires.
When installing winter tires, be sure to
replace all four tires.
! Winter (snow) tires
Winter tires are best suited for driving on
snow-covered and icy roads. However
winter tires do not perform as well as
summer tires and all season tires on roads
other than snow-covered and icy roads.
& Tire pressure monitoring
system (TPMS) (if equipped)
The tire pressure monitoring system pro-
vides the driver with a warning message
by sending a signal from a sensor that is
installed in each wheel when tire pressure
is severely low. The tire pressure monitor-
ing system will activate only when the
vehicle is driven. Also, this system may
not react immediately to a sudden drop in
tire pressure (for example, a blow-out
caused by running over a sharp object).
If you adjust the tire pressures in a warm
garage and will then drive the vehicle in
cold outside air, the resulting drop in tire
pressures may cause the low tire pressure
warning light to illuminate. To avoid this
problem when adjusting the tire pressures
in a warm garage, inflate the tires to
pressures higher than those shown on the
tire placard. Specifically, inflate them by an
extra 1 psi (6.9 kPa, 0.07 kgf/cm
every difference of 108F (5.68C) between
the temperature in the garage and the
temperature outside. By way of example,
the following table shows the required tire
pressures that correspond to various out-
side temperatures when the temperature
in the garage is 608F (15.68C).
Example:
Tire size: P215/70R16 99S, P225/60R17
98T
Standard tire pressures:
Front: 32 psi (220 kPa, 2.2 kgf/cm
Rear: 30 psi (210 kPa, 2.1 kgf/cm
Garage temperature: 608F (15.68C)
Adjusted pressure
Outside
[psi (kPa, kgf/cm
temperature
Front
35 (240, 2.4)
308F (−18C)
37
108F (−128C)
(255, 2.55)
−108F
39 (270, 2.7) 37 (255, 2.55)
(−238C)
Example:
Tire size: P205/60R16 91V, P215/50R17
90V, P225/50R17 93V, 225/45R18 91W
Standard tire pressures:
Front: 33 psi (230 kPa, 2.3 kgf/cm
Rear: 32 psi (220 kPa, 2.2 kgf/cm
2
) for
Garage temperature: 608F (15.68C)
Outside
temperature
308F (−18C)
108F (−128C)
−108F
(−238C)
If the low tire pressure warning light
2
illuminates when you drive the vehicle in
)
cold outside air after adjusting the tire
2
)
pressures in a warm garage, re-adjust the
tire pressures using the method described
above. Then, increase the vehicle speed
2
to at least 20 mph (32 km/h) and check to
)]
see that the low tire pressure warning light
Rear
goes off a few minutes later. If the low tire
33 (230, 2.3)
pressure warning light does not go off, the
tire pressure monitoring system may not
35
(240, 2.4)
be functioning normally. In this event, go
to a SUBARU dealer to have the system
inspected as soon as possible.
While the vehicle is driven, friction be-
tween tires and the road surface causes
the tires to warm up. After illumination of
the low tire pressure warning light, any
increase in the tire pressures caused by
2
)
an increase in the outside air temperature
2
)
Adjusted pressure
2
[psi (kPa, kgf/cm )]
Front
Rear
36 (250, 2.5) 35 (240, 2.4)
38 37
(265, 2.65) (255, 2.55)
40 (280, 2.8) 39 (270, 2.7)