TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: PRECAUTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 L
Service Category: Suspension	Section: Tire Pressure Monitoring
Model Year: 2008	Model: Sequoia	Doc ID: RM000000XMK02TX
Title: TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: PRECAUTION (2008 Sequoia)

PRECAUTION

1. TIRE PRESSURE WARNING SYSTEM PRECAUTION

(a) When the tire pressure warning light turns on, immediately check the tire pressures and adjust them to the specified value.

Cold Tire Inflation Pressure:

Tire Size	Front Pressure	Rear Pressure
P275/65R18	230 kPa (2.3 kgf/cm², 33 psi)	230 kPa (2.3 kgf/cm², 33 psi)
P275/55R20	210 kPa (2.1 kgf/cm², 30 psi)	230 kPa (2.3 kgf/cm², 33 psi)

(b) If the tire pressure warning light turns on after blinking for 1 minute, there is a malfunction in the system. Check for DTCs.

(c) It is necessary to register the transmitter ID in the tire pressure warning ECU after replacing the tire pressure warning valve and transmitter and/or tire pressure warning ECU .

(d) When replacing the tire pressure warning ECU:

(1) Using the Data List, read the transmitter IDs registered in the ECU and make a note of them 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.

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 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/cm², 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) When tires and wheels are replaced, always ensure that each transmitter ID is correctly registered.

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 .

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 .