Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - TIRE PRESSURE MONITORING
TIRE PRESSURE WARNING SYSTEM - SYSTEM DESCRIPTION
| DESCRIPTION OF SYSTEM |
When the tire pressure warning system detects that the tire pressure of a tire becomes lower than the threshold, it will inform the driver using a warning light.
The tire pressure warning antenna receives the transmitter ID, temperature and tire pressure information from the tire pressure warning valve and transmitters shown in the following illustration. The tire pressure warning ECU and receiver uses this information to determine when the pressure in one of the tires has dropped.
| *1 | Tire Pressure Warning ECU and Receiver | *2 | Tire Pressure Warning Valve and Transmitter |
| *3 | Combination Meter Assembly - Tire Pressure Warning Light | *4 | Tire Pressure Warning Antenna (for Rear Side) |
| *5 | Tire Pressure Warning Antenna (for Front Side) | *6 | Tire Pressure Warning Reset Switch |
| *a | Front | *b | Radio Waves |
| DESCRIPTION OF REGISTRATION |
When tires and wheels are replaced, always ensure that each transmitter ID is correctly registered.
When one or more tire pressure warning valve and transmitters or the tire pressure warning ECU and receiver is replaced, the transmitter IDs for all of the tire pressure warning valve and transmitters must be re-registered. Before registering the transmitter ID of a new tire pressure warning valve and transmitter, check the Data List and record all of the transmitter IDs that are already registered.
| TIRE PRESSURE WARNING RESET SWITCH |
By operating the tire pressure warning reset switch, the tire pressure warning ECU and receiver can be set to issue a warning at an inflation pressure that corresponds to the type of tires fitted to the vehicle. Therefore, the warning threshold must be set to the proper value in order to comply with local regulations.
Operate the tire pressure warning reset switch only after the inflation pressures of all tires have been adjusted on the vehicle.
| DESCRIPTION OF INITIALIZATION |
During initialization, the tire pressure warning valve and transmitters measure the inflation pressure of the tires, and register the signals that are transmitted into the tire pressure warning ECU and receiver at a frequency of about once per minute. The initialization process is completed when signals from all tires have been received.
Perform initialization in the following cases:
Before delivery of a new vehicle.
After replacement of the tire pressure warning ECU and receiver*.
After replacement of a tire pressure warning valve and transmitter*.
When the specified tire pressure changes due to the use of a different size or type of tire.
When the specified tire pressure changes due to a change in the vehicle load, the speed range that the vehicle will be used in, etc.
When a tire rotation is performed and the specified tire pressures are different for the front and rear of the vehicle.
- HINT:
- *: Perform initialization after the transmitter ID registration is completed.
| DESCRIPTION OF ID SWITCHING FUNCTION |
By designating the ID registration location, it is possible to register transmitter IDs for both the main and 2nd sets of tires.
If IDs are registered for both the main and 2nd tire sets, it is possible to switch between the two sets of tires by pressing the tire pressure warning reset switch ().
- NOTICE:
- Be careful as the method to perform ID switching differs from the method to perform initialization.
When reading the status for a registered ID, it is only possible to read the ID information for the selected set of tires.
- HINT:
- In order to read the IDs registered for the main tire set, it is necessary to set the ID selection setting to "Main". Likewise, it is necessary to set the ID selection setting to "2nd" in order to read IDs registered for the 2nd set of tires.
| FUNCTION OF MAIN COMPONENTS |
| Component | Function |
| Tire Pressure Warning ECU and Receiver | Receives the data from the tire pressure warning antenna and monitors the tire pressure. When the tire pressure warning ECU and receiver detects a drop in the tire pressure, a system malfunction, or initialization mode, it outputs the respective signal to the combination meter assembly. When the tire pressure warning ECU and receiver detects that the vehicle speed signal is lost, it determines that the vehicle is being driven. |
| Tire Pressure Warning Valve and Transmitter | Detects the pressure and internal temperature of the tire and transmits the measured values and the ID code to the tire pressure warning antenna. |
Tire Pressure Warning Antenna (for Rear Side) Tire Pressure Warning Antenna (for Front Side) | Receives the tire pressure warning valve and transmitter signal and transmits this data to the tire pressure warning ECU and receiver. |
| Tire Pressure Warning Reset Switch | Stores the warning threshold determined by the current tire pressure as the set pressure in the tire pressure warning ECU and receiver when operated. Pressing this switch performs ID switching. |
| Combination Meter Assembly | Transmits the vehicle speed signal to the tire pressure warning ECU and receiver. |
| Tire Pressure Warning Light | Illuminates after blinking for 1 minute to warn the driver in accordance with the signal from the tire pressure warning ECU and receiver. Displays 2-digit Diagnostic Trouble Codes (DTC). |