OUTLINE
A direct-sensing type tire pressure warning system is used.
Since tire pressure decreases over time, regular adjustments are necessary. When the tire pressure warning system detects that the tire inflation pressure has dropped lower than a threshold, it will illuminate the tire pressure warning light to warn the driver.
The 4 tire pressure warning valve and transmitters each send tire inflation pressure, temperature and ID code information to the tire pressure warning ECU and receiver.*
*: Models with compact size spare tire (models with full size spare tire have 5 tire pressure warning valve and transmitters.)
The tire pressure warning ECU and receiver, which consists of a receiver and an ECU, monitors the tire pressure warning valve and transmitters to detect low tire pressure in each of the 4 tires*.
*: Models with full size spare tire include an additional transmitter.
The operation of the tire pressure warning system includes a warning function, initial check function, initialization function and diagnosis function.
The tire inflation pressure display function is a function that displays the pressure of each tire together with the position of the identified tire on the multi-information display.*
*: Models with tire inflation pressure display function
An automatic ID registration function has been provided. This function enables the ID of each tire pressure warning valve and transmitter to be registered automatically by driving the vehicle for 10 to 30 minutes after entering ID registration mode with the tire pressure warning valve and transmitters installed to the wheels.*
*: Models with tire inflation pressure display function
ID codes for 2 tire sets, a main tire set and a sub tire set, can be stored in the tire pressure warning ECU and receiver.*
*: Models with ID switching function
Tech Tips
Refer to the repair manual for how to register or select the sub ID codes.
The transmission cycle with which the information is sent from a tire pressure warning valve and transmitter to the tire pressure warning ECU and receiver is determined as follows based on the travel mode and the acceleration sensor built into each tire pressure warning valve and transmitter.
| Travel Mode | Transmission Cycle |
|---|---|
| While stopped*1 | 1 time / 96 seconds |
| While traveling*2 | 2 times / 16 seconds |
| While traveling*3 | 3 or 4 times / 48 seconds |
*1: When G that is applied to the acceleration sensor is less than 8 G.
*2: When G that is applied to the acceleration sensor is 8G or greater (at start-up).
*3: When G that is applied to the acceleration sensor is 8G or greater (after start-up phase has ended).
PRECAUTION
Ignition Switch Expressions
The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this section:
| Expression | Ignition Switch (Position) | Engine Switch (Condition) |
|---|---|---|
| Ignition Switch Off | LOCK | Off (Lock) |
| Ignition Switch ACC | ACC | On (ACC) |
| Ignition Switch ON | ON | On (IG) |
| Engine Start | START | On (Start) |
The type of tire pressure warning ECU and receiver used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.
| Vehicle Specification | Part Name in Manual | Actual Part Name |
|---|---|---|
| Models with Smart Entry and Start System | Tire Pressure Warning ECU and Receiver | Electrical Key and TPMS Receiver Assembly |
| Models without Smart Entry and Start System | Door Control and Tire Pressure Monitoring System Receiver Assembly |
The system is disabled in the following conditions: (When the condition becomes normal, the system will work properly.)
When all of the tires and wheels that have the tire pressure warning valve and transmitters registered with the tire pressure warning ECU and receiver have not been installed.
When all of the transmitter ID codes are not registered with the tire pressure warning ECU and receiver.
When the tire pressure is 380 kPa (3.9 kgf/cm2, 3.8 bar) or more.
When the transmitter battery is depleted. (Battery life: approximately 10 years)
The system may become disabled in the following conditions: (When the condition becomes normal, the system will work properly.)
When electric devices or facilities using similar radio frequencies are nearby.
When a wireless device or other equipment operating at a similar frequency is in use in the vehicle.
When a window tint that affects radio wave signals is installed.
When there is a lot of snow or ice on the vehicle, in particular, around the wheels or wheel housings.
When non-genuine wheels are used.
When non-genuine tires are used.
When tire chains are used.
When aftermarket tire repair sealant is used.
The tire pressure warning system may not function properly if aftermarket tire repair sealant has been used to repair a flat tire. If this type of sealant has been used, the tire pressure warning valve and transmitter should be replaced with a new one after repairing or replacing the tire.
The tire pressure warning light may illuminate due to natural pressure loss caused by air passing through the tires or by changes in tire pressure caused by temperature fluctuations. When adjusting tire pressure, please be aware of the driving conditions and temperature conditions. The tire warning light is prone to illuminate especially in late autumn and during winter.