Tire Monitoring System: Description and Operation

TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: SYSTEM DIAGRAM

SYSTEM DIAGRAM




HINT: Each tire pressure warning valve and transmitter sends information on the temperature inside the tire, the transmitter ID and the tire pressure.

TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: SYSTEM DESCRIPTION

SYSTEM DESCRIPTION

1. DESCRIPTION OF SYSTEM
(a) Each tire pressure warning valve and transmitter is equipped with a tire pressure sensor and a transmitter and is installed in each tire and wheel assembly. The sensor measures the tire pressure. The measured value and transmitter ID are transmitted to the tire pressure warning antenna and receiver on the body as radio waves and then sent to the tire pressure warning ECU from the tire pressure warning antenna and receiver. If the transmitter ID has already been registered, the ECU compares the measured air pressure value with the standard value. When the value is less than the standard value registered in the tire pressure warning ECU, the warning light on the accessory meter comes on.





2. INITIAL CHECK





(a) After the ignition switch is turned to ON, the tire pressure warning light comes on for 3 seconds and then goes off.
HINT: If the warning light does not come on for 3 seconds, troubleshoot the tire pressure warning light circuit Tire Pressure Warning Light Circuit.

3. WHEN TIRE PRESSURE WARNING LIGHT IS LIT
(a) When the tire pressure warning light does not go off, or when it comes on while driving, check the tire pressure. If the tire pressure warning light comes on within several hours of adjusting the tire pressure, the tire may have a slow leak.
(b) Under the following conditions, the system may not function properly:
(1) The system will not function properly in the following conditions:
(When the condition becomes normal, the system will work properly.)

- If tires not equipped with tire pressure warning valve and transmitters are used.
- If the ID code on the tire pressure warning valve and transmitters is not registered in the tire pressure warning ECU.
- If the tire inflation pressure is absolute pressure: 600 kPa (6.0 kgf/cm2, 87 psi) or more; relative pressure: 500 kPa (5.0 kgf/cm2, 73 psi) or more.
- If the tire pressure warning valve and transmitter battery voltage drops (battery life: 10 years).
(2) The system may not function properly in the following conditions:
(When the condition becomes normal, the system will work properly.)

- If electronic devices or facilities using similar radio wave frequencies are nearby.
- If a radio set at similar frequencies is used in the vehicle.
- If a window tint that affects the radio wave signal is installed.
- If there is a lot of snow or ice on the vehicle, in particular around the wheels or wheel housings.
- If non-genuine wheels are used.
- If tire chains are used.

(c) After removing and installing the ECU or a sensor, check for DTCs.
4. FUNCTION OF COMPONENTS