Toyota Tundra. Manual — part 2761

before removing the tire pressure warning ECU.

2. Register the transmitter IDs after installing a new tire pressure warning ECU.

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 the old one. Register the transmitter ID in the tire
pressure warning ECU after replacing the tire pressure warning valve and transmitter and
installing the tires and wheels on the vehicle.

Fig. 5: Identifying Pressure Warning Valve & Transmitter
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

f. When replacing the tire pressure warning ECU and/or the tire pressure warning valves and

transmitters, it is necessary to perform INITIALIZATION after the REGISTRATION .

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

, 1.5 psi) for every 10°C (50°F) 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. As a result,
incorrect tire pressure warning operation should decrease.

2. IN CASE OF TIRE AND WHEEL REPLACEMENT

a. Depending on the tire type, the system may not function properly even if the specified wheels are

used.

b. When tires and wheels are replaced, always ensure that each transmitter ID is correctly registered.

NOTE:

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.

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

3. INITIALIZATION PRECAUTION

a. Initialize the tire pressure warning system after any of the following is performed:



Replacing the tire pressure warning ECU and/or the tire pressure warning valve and
transmitter.



When rotating the tires on vehicles whose front and rear tire inflation pressure standard
values are different.

HINT:

The tire pressure warning system will not operate properly if it is not initialized (See
INITIALIZATION ).

4. FAIL-SAFE FUNCTION

a. When a system malfunction occurs in the tire pressure warning system, the tire pressure warning

light comes on after blinking for 1 minute and informs the driver of the system failure.

b. The result of this diagnosis is stored in the tire pressure warning ECU.

5. CHECK TIRE PRESSURE AFTER REPAIRS

a. After repairs, confirm that the actual tire pressures are displayed in the Data List (See DATA

LIST/ACTIVE TEST ).

PARTS LOCATION

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

Fig. 6: Identifying Tire Pressures Warning System Parts Location
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

SYSTEM DIAGRAM

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

Fig. 7: Tire Pressures Warning System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

The tire pressure warning valve and transmitter sends information on the temperature inside the tire, the ID, and
the tire pressure.

SYSTEM DESCRIPTION

1. DESCRIPTION OF SYSTEM

a. Each tire pressure warning valve and transmitter is equipped with a tire pressure sensor and

transmitter and is installed in each tire wheel. The sensor measures the tire pressure. The measured

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra