Toyota Tundra. Manual — part 2762

value and transmitter ID are transmitted to the tire pressure warning antenna and receiver on the
body as radio waves and then sent to the tire pressure warning ECU from the tire pressure warning
antenna and receiver. If the transmitter ID has already been registered, the ECU compares the
measured tire pressure value with the specified value. When the value is less than the specified
value registered in the tire pressure warning ECU, the warning light on the combination meter turns
on. The tire pressure warning reset switch addresses the differences in the standard pressure of the
tire.

Fig. 8: Tire Pressures Warning Valve And Transmitter Operation Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. INITIAL CHECK

a. After the ignition switch is turned ON, the tire pressure warning light turns on for 3 seconds and

then turns off.

HINT:

If the warning light does not turn on for 3 seconds, troubleshoot the pressure warning light circuit.

TROUBLE AREA REFERENCE TABLE

Trouble Area

Proceed to

Tire pressure warning light circuit TIRE PRESSURE WARNING LIGHT CIRCUIT

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

Fig. 9: Pressure Warning Light Timing Table
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

3. WHEN TIRE PRESSURE WARNING LIGHT IS LIT

a. When the tire pressure warning light does not go off, or when it turns on during driving, check the

tire pressure. If the tire pressure warning light turns on within several hours after adjusting the tire
pressure, the tire may have a slow air leak.

b. Under the following conditions, the system may not function properly.

1. The system will be disabled in the following conditions:

HINT:

When the problem is resolved, the system will operate properly.



Tires without a tire pressure warning valve and transmitter are used.



When a tire pressure warning valve and transmitter ID is not registered in the ECU.



The tire pressure is abnormally high (absolute pressure: 600 kPa (6.1 kgf/cm

2

, 87 psi)

or higher; relative pressure: 500 kPa (5.1 kgf/cm

2

, 73 psi) or higher).



The battery of the tire pressure warning valve and transmitter has been depleted
(battery life: 10 years).

2. The system may be disabled in the following conditions:

HINT:

When the problem is resolved, the system will operate properly.



Facilities or devices that use similar radio frequencies are located in the vicinity of the
vehicle.



A radio device of similar frequency is used in the vehicle.



A type of film that affects radio waves is attached to the windows.



A large amount of snow or ice is stuck to the vehicle, especially onto the wheels and
around the wheel houses.



Any wheels other than the specified ones are used.



Tire chains are used.

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

c. If a tire pressure warning valve and transmitter is removed from a wheel, replace the grommets.

d. After removing and installing the ECU or a sensor, check for a DTC and verify that it is a normal

code.

4. FUNCTION OF COMPONENTS

COMPONENTS FUNCTION TABLE

5. TIRE PRESSURE WARNING RESET SWITCH



By operating the tire pressure warning reset switch, the tire pressure warning ECU can be set to
issue a warning at an inflation pressure that corresponds to the standard pressure of tires. Therefore,
the dealer must set the warning threshold to the proper value in order to comply with local
regulations.



Operate the tire pressure warning reset switch only after the inflation pressures of all tires have
been adjusted on the vehicle.



To initialize the system, press and hold the tire pressure warning reset switch for 3 seconds or
longer with the ignition switch to ON. When the system receives the initialization signal, the
warning light blinks 3 times (1 second on, 1 second off).



During initialization, the tire pressure warning valve and transmitters measure the inflation pressure
of the tires, and register the signals that are transmitted into the tire pressure warning ECU at a
frequency of once per minute. The initialization process is completed when signals from all tires
have been received.

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:



Use these procedures to troubleshoot the tire pressure warning system.



*: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

2. CUSTOMER PROBLEM ANALYSIS

a. Interview the customer to confirm the trouble.

Components

Function

Tire pressure warning
valve and transmitter

Combined as a single unit with a disc wheel air valve, it measures tire pressure
and temperature and transmits a transmitter ID for measurement values and
identification. Has a built-in battery.

Tire pressure warning
antenna and receiver

Receives signals from a transmitter and sends the signals to the tire pressure
warning ECU.

Tire pressure warning
ECU

Determines the current status based on the signals from the receiver, and
displays the status on the combination meter.

Tire pressure warning
light

Located in the combination meter, it informs the driver of lowered tire pressure
and system failure.

Tire pressure warning
reset switch

Enters initialization mode for tire or wheel replacement.

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra

HINT:

It is important to collect as much specific information as possible from the customer to allow for a
quick repair.

3. ADJUST TIRE PRESSURE*

a. Turn the ignition switch off.

b. Connect the Techstream to the DLC3.

c. Turn the ignition switch to ON and the Techstream on.

d. Enter the following menus: Chassis/Tire Pressure Monitor/Data List.

e. Read the "ID Tire Inflation Pressure" values.

f. Adjust all tire pressures to the standard values (See TIRE PRESSURE WARNING SYSTEM ).

g. Check the Data List (See DATA LIST/ACTIVE TEST ).

HINT:



It may take up about 5 to 6 minutes to display the updated tire pressure data.



If the problem is that the tire pressure decreases, wait until all of the tire pressure data is
received by the ECU. If the data is received, the tire pressure warning light will turn off.

Result

RESULT TABLE

B: Go to step 9

A: Go to next step

4. CHECK FOR DTC*

a. Check for DTC (See DTC CHECK/CLEAR ).

Result

RESULT TABLE

B: Go to step 6

A: Go to next step

Result

Proceed to

Tire pressure warning light remains on.

A

Tire pressure warning light goes off.

B

Result

Proceed to

DTC is output

A

DTC is not output

B

2009 Toyota Tundra

2009 SUSPENSION Tire & Wheel - Tundra