Tire Pressure Monitoring System (Tpms) - Subaru 2008 TRIBECA Owner's Manual

11-24
Maintenance and service
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)
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 come on. 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 10 F (5.6 C) 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 60 F (15.6 C).
Standard tire pressures:
Front: 33 psi (230 kPa, 2.3 kgf/cm
Rear: 32 psi (220 kPa, 2.2 kgf/cm
Garage temperature: 60 F (15.6 C)
Outside
Adjusted pressure
temperature
[psi (kPa, kgf/cm
front
36 (250, 2.5)
30 F (−1 C)
38
10 F (−12 C)
(265, 2.65)
−10 F
40 (280, 2.8)
(−23 C)
If the low tire pressure warning light
comes on when you drive the vehicle in
cold outside air after adjusting the tire
pressures in a warm garage, re-adjust the
tire pressures using the method described
above. Then, increase the vehicle speed
to at least 20 mph (32 km/h) and check to
see that the low tire pressure warning light
goes off a few minutes later. If the low tire
pressure warning light does not go off, the
2
) for
tire pressure monitoring system may not
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
2
increase in the tire pressures caused by
)
an increase in the outside air temperature
2
)
or by an increase in the temperature in the
tires can cause the low tire pressure
warning light to go off.
2
)]
System resetting is necessary when the
rear
wheels are changed (for example, a
switch to snow tires) and new TPMS
35 (240, 2.4)
valves are installed on the newly fitted
37
wheels. Have this work performed by a
(255, 2.55)
SUBARU dealer following wheel replace-
39 (270, 2.7)
ment.
It may not be possible to install TPMS
valves on certain wheels that are on the
market. Therefore, if you change the
wheels (for example, a switch to snow
tires), use wheels that have the same part
number as the standard-equipment
wheels. Without four operational TPMS
valve/sensors on the wheels, the TPMS
will not fully function and the warning light
in the instrument panel will illuminate
steadily after blinking for approximately
one minute.