winter tires TOYOTA SIENNA 2007 Service Repair Manual

TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEMTW–11
TW
(e) When replacing the tire pressure warning valve and
transmitter:
(1) Take a note of the 8-digit number (transmitter ID)
written on the new tire pressure warning valve
and transmitter when replacing it. Register the
transmitter IDs in the tire pressure warning ECU
after replacing the tire pressure warning valve
and transmitter and installing the tires and
wheels on the vehicle.
NOTICE:
The transmitter ID is written on the tire
pressure warning valve and transmitter. It
will be unable to be read after installing the
tire pressure warning valve and transmitter
on the tire and wheel. Therefore, take a note
of the transmitter ID before installing the tire
pressure warning valve and transmitter. In
order to register IDs, all 4 IDs for the vehicle
are necessary.
(f) When replacing the tire pressure warning ECU and
the tire pressure warning valves and transmitters, it
is necessary to perform the initialization (See page
TW-23) after the registration (See page TW-20).
(g) Precautions about the tire pressure:
• The tire pressures decrease naturally.
• In winter, tire pressure may decrease due to low
ambient temperatures (tire pressure decreases
by approximately 10 kPa (0.1 kgf/cm
2, 1.45 psi)
for every 10
C (50F) drop in the ambient
temperature). Therefore, the tire pressure
warning is more likely to operate if the tire
pressures are not adjusted appropriately. If the
daily temperature variation is large, pressurize
the tires high so that the tire pressures are
suitable under cold conditions. Incorrect tire
pressure warning operation becomes less likely.
C159177E01