Dtc C2121/21 No Signal From Transmitter Id1


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FREQUENCY RECEIVING CONDITION

IDENTIFY TRANSMITTER CORRESPONDING TO DTC

CHECK TRANSMITTER ID

REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

REGISTRATION OF TRANSMITTER ID

PERFORM INITIALIZATION

CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

DTC C2121/21 No Signal from Transmitter ID1

DTC C2122/22 No Signal from Transmitter ID2

DTC C2123/23 No Signal from Transmitter ID3

DTC C2124/24 No Signal from Transmitter ID4

DTC C2125/25 No Signal from Transmitter ID5

DTC C2181/81 Transmitter ID1 not Received (Test Mode DTC)

DTC C2182/82 Transmitter ID2 not Received (Test Mode DTC)

DTC C2183/83 Transmitter ID3 not Received (Test Mode DTC)

DTC C2184/84 Transmitter ID4 not Received (Test Mode DTC)

DTC C2185/85 Transmitter ID5 not Received (Test Mode DTC)


DESCRIPTION

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 to the tire pressure warning ECU and receiver in the vehicle as radio waves. 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 illuminates.
The tire pressure warning valve and transmitters constantly send radio waves to the tire pressure warning ECU and receiver.
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.
  1. Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
  2. Devices using similar radio frequencies are used in the vehicle.
  3. The ID of a tire pressure warning valve and transmitter is mistyped during registration.
  4. 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 20 minutes*1 (10 minutes*2) 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 20 minutes*1 (10 minutes*2), these DTCs are stored.
  1. *1: for FMVSS138 Type
  2. *2: for ECE-R64 Type
DTCs from C2121/21 to C2124/24 (C2121/21 to C2125/25: w/ Spare Tire) can only be cleared by using the GTS. DTCs from C2181/81 to C2184/84 (C2181/81 to C2185/85: w/ Spare Tire) 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 C2184/84 (C2181/81 to C2185/85: w/ Spare Tire) 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:
  1. Tire pressure warning valve and transmitter is not in stop mode.
  2. Any transmitter ID is not received from tire pressure warning valve and transmitters.
  3. For 20 minutes*1 (10 minutes*2) 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:
  1. Tire pressure warning valve and transmitter is not in stop mode.
  2. No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes*1 (10 minutes*2) or more.
  1. Tire pressure warning valve and transmitter
  2. Tire pressure warning ECU and receiver
C2181/81
C2182/82
C2183/83
C2184/84
C2185/85
Test mode procedure is performed.
  1. Tire pressure warning valve and transmitter
  2. Tire pressure warning ECU and receiver
  1. *1: for FMVSS138 Type
  2. *2: for ECE-R64 Type
NOTICE:
w/ ID Switching Function:
(Main) is displayed on the DTC screen for the DTCs even when the 2nd set of tires is selected.
HINT:
  1. 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.
  2. When DTC C2174/74 is output together with DTC C2121/21, C2122/22, C2123/23 and/or C2124/24 (C2121/21, C2122/22, C2123/23, C2124/24 and/or C2125/25: w/ Spare Tire), inspect and repair the trouble areas indicated by DTC C2174/74 first (LandCruiser RM000000XNA0GTX.html).

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Tire Pressure Monitoring.Tire Pressure Warning System. Dtc C2121/21 No Signal From Transmitter Id1


INSPECTION PROCEDURE

NOTICE:
  1. 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.
  2. It is necessary to perform initialization (LandCruiser RM000000XMZ0AOX.html) after registration (LandCruiser RM000000XN10DCX.html) 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

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

    1. 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.

    2. 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.


NG
CHECK IF ANY DEVICE IS INSTALLED BY USER
OK


2.IDENTIFY TRANSMITTER CORRESPONDING TO DTC

  1. Set the tire pressure to the specified value (LandCruiser RM000003DGS00UX.html).

  1. Turn the ignition switch off.

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch ON.

  1. Turn the GTS on.

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

  1. 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.*1
    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.*1
    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.*1
    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.*1
    ID 5 Tire Inflation Pressure*2
    		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.*1
    HINT:
    1. *1: It may take a few minutes until the values are displayed.
    2. *2: w/ Spare Tire
    3. The wheel position cannot be determined from ID1 through ID4 or ID1 through ID5 (w/ Spare Tire) on the Data List.

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

  1. Check the Data List.

    NOTICE:
    1. It may take a few minutes to display the updated tire pressure data.
    2. 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.
    3. Record the transmitter ID of which "ID Tire Inflation Pressure" data corresponds to each tire.

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

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


B
END
A


3.CHECK TRANSMITTER ID

  1. Turn the ignition switch off.

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch ON.

  1. Turn the GTS on.

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

  1. 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*1
    		ID No. registered for transmitter ID1 displayed
    		-
    Registered ID 2 code
    		Registered ID2 code/
    min.: 0, max.: FFFFFFF*1
    		ID No. registered for transmitter ID2 displayed
    		-
    Registered ID 3 code
    		Registered ID3 code/
    min.: 0, max.: FFFFFFF*1
    		ID No. registered for transmitter ID3 displayed
    		-
    Registered ID 4 code
    		Registered ID4 code/
    min.: 0, max.: FFFFFFF*1
    		ID No. registered for transmitter ID4 displayed
    		-
    Registered ID 5 code*2
    		Registered ID5 code/
    min.: 0, max.: FFFFFFF*1
    		ID No. registered for transmitter ID5 displayed
    		-
    HINT:
    1. *1: Displayed only when the ID No. is not registered.
    2. *2: w/ Spare Tire
    3. The wheel position cannot be determined from ID1 through ID4 or ID1 through ID5 (w/ Spare Tire) on the Data List.


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Tire Pressure Monitoring.Tire Pressure Warning System. Dtc C2121/21 No Signal From Transmitter Id1


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

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

    Result:
    Result
    		Proceed to
    Match
    		A
    Do not match
    		B


B
Go to step 5
A


4.REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

  1. Replace the tire pressure warning valve and transmitter (LandCruiser RM000001F7R07PX.html).


NEXT


5.REGISTRATION OF TRANSMITTER ID

  1. Perform registration (LandCruiser RM000000XN10DCX.html).


NEXT


6.PERFORM INITIALIZATION

  1. Perform initialization (LandCruiser RM000000XMZ0AOX.html).


NEXT


7.CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

  1. Turn the ignition switch off.

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch ON.

  1. Turn the GTS on.

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

  1. 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.*1
    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.*1
    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.*1
    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.*1
    ID 5 Tire Inflation Pressure*2
    		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.*1
    HINT:
    1. *1: It may take a few minutes until the values are displayed.
    2. *2: w/ Spare Tire
    3. 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.
    4. The wheel position cannot be determined from ID1 through ID4 or ID1 through ID5 (w/ Spare Tire) 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


B
END
A

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER (LandCruiser RM000002L8501CX.html)