The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressures. The measured values are transmitted as radio waves to the tire pressure warning antenna and then set to the tire pressure warning ECU and receiver. The ECU compares the measured air pressure values with the air pressure threshold. When the measured air pressure value is less than this threshold, the warning light in the combination meter assembly illuminates.

The tire pressure warning valve and transmitters constantly send radio waves to the tire pressure warning antenna.

Under the conditions below, the tire pressure warning ECU and receiver is unable to receive the signals from the tire pressure warning valve and transmitters, and a DTC is stored.

Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

Devices using similar radio frequencies are used in the vehicle.

The ID of a tire pressure warning valve and transmitter is mistyped during registration.

A tire, wheel and/or transmitter from a different vehicle is installed.

HINT:

When no transmitter ID is received from a tire pressure warning valve and transmitter for a total of 10 minutes while the vehicle speed is more than 37 km/h (23 mph), or no transmitter ID is received from all the tire pressure warning valve and transmitters for a total of 10 minutes, these DTCs are stored.

DTCs from C2121/21 to C2125/25 can only be cleared by using the GTS. DTCs from C2181/81 to C2185/85 can be cleared when the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs from C2181/81 to C2185/85 are output only in test mode.

DTC No.

DTC Detection Condition

Trouble Area

C2121/21
C2122/22
C2123/23
C2124/24
C2125/25

Following condition (a) or (b) is met:
(a) When all conditions below are met:

Tire pressure warning valve and transmitter is not in stop mode.

Any transmitter ID is not received from tire pressure warning valve and transmitters.

For 10 minutes or more, vehicle speed is more than 37 km/h (23 mph) or no vehicle speed signal is received.

(b) When both conditions below are met:

Tire pressure warning valve and transmitter is not in stop mode.

No transmitter ID is received from tire pressure warning valve and transmitters for 10 minutes or more.

Tire pressure warning valve and transmitter

Tire pressure warning antenna (for Rear Side)

Tire pressure warning antenna (for Front Side)

Harness or connector

Tire pressure warning ECU and receiver

C2181/81
C2182/82
C2183/83
C2184/84
C2185/85

Test mode procedure is performed.

Tire pressure warning valve and transmitter

Tire pressure warning antenna (for Rear Side)

Tire pressure warning antenna (for Front Side)

Harness or connector

Tire pressure warning ECU and receiver

NOTICE:

For the ID switching function, (Main) is displayed on the DTC screen for the DTCs even when the 2nd set of tires is selected.

HINT:

It is necessary to perform the following procedure to identify the tire pressure warning valve and transmitter that is malfunctioning because it cannot be identified by the output DTC.

WIRING DIAGRAM

Dtc C2121/21 No Signal From Transmitter Id1. TIRE PRESSURE MONITORING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

NOTICE:

When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the GTS and write them down before removal.

It is necessary to perform initialization () after registration () of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU and/or one of the valve and transmitters has been replaced.

1.CHECK FREQUENCY RECEIVING CONDITION

Check that the vehicle is not located in an area such as described below:

Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

HINT:

If the vehicle is located in an area such as the one described above, the tire pressure warning light may come on only in a particular area.

Devices using similar radio frequencies are used in the vehicle.

OK:
Facilities or devices that use similar radio frequencies are not located in the vicinity of the vehicle.

HINT:

Radio transmissions may be interrupted due to the surroundings or devices installed by the user.

CHECK IF ANY DEVICE IS INSTALLED BY USER

OK

2.CHECK TEST MODE DTC (C2195/95)

Turn the engine switch off.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Enter the following menus: Chassis / Tire Pressure Monitor / Utility / Signal Check.

Perform the test mode inspection ().

Result:
Result Proceed to
DTC C2195/95 is cleared A
DTC C2195/95 is not cleared B

GO TO DTC C2195/95 ()

A

3.IDENTIFY TRANSMITTER CORRESPONDING TO DTC

Set the tire pressure to the specified value ().

Turn the engine switch off.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

Check the values by referring to the table below.

Tire Pressure Monitor
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
ID 1 Tire Inflation Pressure	ID1 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*
ID 2 Tire Inflation Pressure	ID2 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*
ID 3 Tire Inflation Pressure	ID3 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*
ID 4 Tire Inflation Pressure	ID4 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*
ID 5 Tire Inflation Pressure	ID5 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*

HINT:

*: It may take a few minutes until the values are displayed.

The wheel position cannot be determined from ID1 through ID5 on the Data List.

Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kg/cm², 5.8 psi) within 30 seconds.

Check the Data List.

NOTICE:

It may take a few minutes to display the updated tire pressure data.

When the "ID Tire Inflation Pressure" data has not changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the data.

Record the transmitter ID of which "ID Tire Inflation Pressure" data corresponds to each tire.

After confirming that the "ID Tire Inflation Pressure" data for one tire has changed, repeat this procedure one by one. Identify the transmitter that corresponds to the DTC.

Result:
Result Proceed to
One or more of transmitters abnormal A
All normal B

END

A

4.CHECK TRANSMITTER ID

Turn the engine switch off.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

Check the values by referring to the table below.

Tire Pressure Monitor
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Registered ID 1 code	Registered ID1 code/ min.: 0, max.: FFFFFFF*	ID No. registered for transmitter ID1 displayed	-
Registered ID 2 code	Registered ID2 code/ min.: 0, max.: FFFFFFF*	ID No. registered for transmitter ID2 displayed	-
Registered ID 3 code	Registered ID3 code/ min.: 0, max.: FFFFFFF*	ID No. registered for transmitter ID3 displayed	-
Registered ID 4 code	Registered ID4 code/ min.: 0, max.: FFFFFFF*	ID No. registered for transmitter ID4 displayed	-
Registered ID 5 code	Registered ID5 code/ min.: 0, max.: FFFFFFF*	ID No. registered for transmitter ID5 displayed	-

HINT:

*: Displayed only when the ID No. is not registered.

The wheel position cannot be determined from ID1 through ID5 on the Data List.

Check the ID number on the identified transmitter by removing it from the tire and wheel.

Dtc C2121/21 No Signal From Transmitter Id1. TIRE PRESSURE MONITORING. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Text in Illustration
*1	Tire Pressure Warning Valve and Transmitter	*2	Transmitter ID (7-digit number)

Confirm that the ID number on the transmitter and recorded transmitter ID match.

Result:
Result Proceed to
Match A
Do not match B

Go to step 6

A

5.REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

Replace the tire pressure warning valve and transmitter ().

NEXT

6.REGISTRATION OF TRANSMITTER ID

Perform registration ().

NEXT

7.PERFORM INITIALIZATION

Perform initialization ().

NEXT

8.CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

Turn the engine switch off.

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

Turn the GTS on.

Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

Check the values by referring to the table below.

Tire Pressure Monitor
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
ID 1 Tire Inflation Pressure	ID1 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*
ID 2 Tire Inflation Pressure	ID2 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*
ID 3 Tire Inflation Pressure	ID3 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*
ID 4 Tire Inflation Pressure	ID4 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*
ID 5 Tire Inflation Pressure	ID5 tire inflation pressure/ min.: Absolute pressure (abs)/ 0 kPa (0 kgf/cm², 0 psi), Relative pressure (gauge)/ 0 kPa (0 kgf/cm², 0 psi) max.: Absolute pressure (abs)/ 480 kPa (4.9 kgf/cm², 70 psi), Relative pressure (gauge)/ 380 kPa (3.9 kgf/cm², 55 psi)	Actual tire inflation pressure	If N/A is displayed, data has not been received.*

HINT:

*: It may take a few minutes until the values are displayed.

When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270 degrees. Then rapidly release the tire pressure and recheck the data.

The wheel position cannot be determined from ID1 through ID5 on the Data List.

Result:
Result Proceed to
Tire pressure values are not displayed. A
All tire pressure readings are equal to specified values. B

END

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER ()

TIRE PRESSURE MONITORING

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

TIRE PRESSURE WARNING SYSTEM

Result	Proceed to
DTC C2195/95 is cleared	A
DTC C2195/95 is not cleared	B

Result	Proceed to
One or more of transmitters abnormal	A
All normal	B

Result	Proceed to
Tire pressure values are not displayed.	A
All tire pressure readings are equal to specified values.	B