Tire Monitoring System: Service Precautions
TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: PRECAUTION
1. TIRE PRESSURE WARNING SYSTEM PRECAUTION
(a) When the tire pressure warning light comes on, immediately check the tire pressures and adjust them to the specified values.
Cold tire inflation pressure:
HINT
*1: For driving under 180 km/h (112 mph).
*2: For driving at 180 km/h (112 mph) or over.
(b) When the tire pressure warning light turns on after blinking for 1 minute, there is a malfunction in the system. Check for DTCs.
(c) 2 sets of the transmitter IDs can be registered in the tire pressure warning ECU and receiver. Either of the sets can be selected by changing the tire pressure warning setting switch between "MAIN" and "2nd".
If the vehicle is driven without setting the tire pressure warning select switch correctly, the tire pressure warning ECU and receiver determines the system is malfunctioning and causes the tire pressure warning light to blink (comes on after blinking for 1 minute).
(d) It is necessary to register the transmitter ID in the tire pressure warning ECU and receiver after replacing the tire pressure warning valve and transmitter and/or tire pressure warning ECU and receiver Registration.
(e) When replacing the tire pressure warning ECU and receiver:
(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 and receiver.
(2) Register the transmitter IDs after installing a new tire pressure warning ECU and receiver.
(f) Precautions about tire pressure:
* 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. As a result, incorrect tire pressure warning operation should decrease.
(g) When replacing the tire pressure warning valve and transmitter:
(1) Take a note of the 7 digit number (transmitter ID) written on the tire pressure warning valve and transmitter when replacing it. Register the transmitter IDs in the tire pressure warning ECU and receiver 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. The ID will be unable to be read after installing the tire pressure warning valve and transmitter to the tire and wheel. Therefore, take a note of the transmitter ID before installing the tire pressure warning valve and transmitter.
2. IN CASE OF TIRE AND WHEEL REPLACEMENT
(a) When tires and wheels are replaced, always be sure to register the transmitter ID correctly.
3. INITIALIZATION PRECAUTION
(a) Initialize the tire pressure warning system after any of the following are performed:
* Replacing the tire pressure warning ECU and receiver and/or the tire pressure warning valve and transmitter.
* When the standard tire inflation pressure value needs to be changed due to a change in planned traveling speed, load weight, etc.
HINT
The tire pressure warning system will not operate properly if it is not initialized Initialization.
4. FAIL-SAFE FUNCTION
(a) When a malfunction occurs in the tire pressure warning system, the tire pressure warning light blinks and informs the driver of the system failure.
(b) The result of this diagnosis is stored in the tire pressure warning ECU and receiver.
5. CHECK TIRE PRESSURE AFTER REPAIRS
(a) After repairs, confirm that the actual tire pressures are displayed in the Data List Scan Tool Testing and Procedures.