Tire Monitoring System: Service Precautions

TIRE PRESSURE WARNING SYSTEM

PRECAUTION

NOTICE:
When the negative (-) battery terminal is disconnected, initialize the following systems after the terminal is reconnected.








1. TIRE PRESSURE WARNING SYSTEM PRECAUTION
(a) When the tire pressure warning light comes on and "LOW TIRE" appears on the multi-information display, check the tire pressure and adjust it 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.)

NOTICE:
Check the ground spare tire as well since this system monitors pressure of all tires including the ground spare tire.

Cold tire inflation pressure:

(b) When the tire pressure warning light comes on after blinking for 1 minute, there is a malfunction in the system. Check for DTCs.
(c) Changing the tire pressure warning select switch between "MAIN" and "2nd" allows registration of 2 transmitter ID sets. Check the tire pressure warning select switch to see whether the tire is registered in "MAIN" or "2nd". If the vehicle is driven without selecting the correct switch position, the tire pressure warning ECU determines that the system is malfunctioning and causes the tire pressure warning light to blink (come on after blinking for 1 minute).
(d) 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.
(e) 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.
(f) 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 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.

(g) When replacing the tire pressure warning ECU and the tire pressure warning valves and transmitters, it is necessary to perform the initialization after the registration.
(h) 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, 1.45 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. Incorrect tire pressure warning operation becomes less likely.
2. IN CASE OF TIRE AND WHEEL REPLACEMENT
(a) When tires and wheels are replaced, always ensure that each transmitter ID is correctly registered.
(b) Before removing the tires from the disc wheels or reinstalling the tires to the disc wheels, be sure to follow the correct procedures for removal and reinstallation of the tire pressure warning valve and transmitter. Failure to do so may cause the tire pressure warning valve and transmitters to break.
3. IN CASE OF REPLACEMENT OF TIRE PRESSURE WARNING ECU, TIRE PRESSURE WARNING VALVE AND TRANSMITTER, OR TIRE(S) WITH DIFFERENT TIRE PRESSURE
(a) Initialize the tire pressure warning system after any of the following is performed:
^ Replacing the tire pressure warning ECU or the tire pressure warning valve and transmitter.
^ Installing tire(s) which require different tire pressure.
^ When changing the tire inflation pressure by changing traveling speed, load weight, etc.

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 will blink for 1 minute and then remain on, and "CHECK SYSTEM" will appear on the multi-information display to inform 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 DATA LIST.