Tire Pressure Warning System: Precaution

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

TIRE PRESSURE WARNING SYSTEM PRECAUTION

When the tire pressure warning light turns on, immediately check the tire pressures and adjust them to the specified value. (The tire pressure warning light will come on after blinking for 1 minute if there is an open in the tire pressure warning light circuit.)

Fig 1: Identifying Tire Pressure Warning Light

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Cold Tire Inflation Pressure:

for Hatchback

TIRE INFLATION PRESSURE SPECIFICATION FOR HATCHBACK

Tire Size	Vehicle Speed	Front kPa (kgf/cm² , psi)	Rear kPa (kgf/cm² , psi)
P175/65R14 81S P185/60R15 84T	Driving below 160 km/h (100 mph)	220 (2.2, 32)	220 (2.2, 32)
P175/65R14 81S P185/60R15 84T	Driving over 160 km/h (100 mph)	240 (2.4, 35)	240 (2.4, 35)

for Sedan

TIRE INFLATION PRESSURE SPECIFICATION FOR SEDAN

Tire Size	Vehicle Speed	Front kPa (kgf/cm² , psi)	Rear kPa (kgf/cm² , psi)
P175/65R14 81S P185/60R15 84T	Driving below 160 km/h (100 mph)	220 (2.2, 32)	220 (2.2, 32)
P175/65R14 81S P185/60R15 84T	Driving over 160 km/h (100 mph)	240 (2.4, 35)	240 (2.4, 35)

When the tire pressure warning light turns on after blinking for 1 minute, there is a malfunction in the system. Check for DTCs.
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 (See REGISTRATION ).
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.
When replacing the tire pressure warning valve and transmitter:
1. Take a note of the 7 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 2: Identifying Tire Pressure Warning Valve And Transmitter Digit Number (Transmitter ID)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  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.
Precautions about the tire pressure:
- The tire pressure decreases naturally.
- In winter, tire pressure may decrease due to low ambient temperatures (tire pressure decreases by approximately 10 kPa (0.1 kgf/cm² , 1.45 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.

IN CASE OF TIRE AND WHEEL REPLACEMENT
1. When tires and wheels are replaced, always ensure that each transmitter ID is correctly registered.
FAIL-SAFE FUNCTION
1. 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.
2. The result of this diagnosis is stored in the tire pressure warning ECU.
CHECK TIRE PRESSURE AFTER REPAIRS
1. After repairs, confirm that the actual tire pressures are displayed in the Data List (See DATA LIST / ACTIVE TEST ).