TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2121/21, C2122/22, C2123/23, C2124/24, C2125/25, C2181/81, C2182/82, C2183/83, C2184/84, C2185/85

DTC Code DTC Name
C2121/21 No Signal from Transmitter ID1
C2122/22 No Signal from Transmitter ID2
C2123/23 No Signal from Transmitter ID3
C2124/24 No Signal from Transmitter ID4
C2125/25 No Signal from Transmitter ID5
C2181/81 Transmitter ID1 not Received (Test Mode DTC)
C2182/82 Transmitter ID2 not Received (Test Mode DTC)
C2183/83 Transmitter ID3 not Received (Test Mode DTC)
C2184/84 Transmitter ID4 not Received (Test Mode 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.


Tech Tips

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 40 km/h (25 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.

  • Vehicle speed is more than 40 km/h (25 mph) or no vehicle speed signal is received for 10 minutes or more.

(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 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 ECU and receiver

Note


  • (Main) is displayed on the DTC screen for the DTCs even when the 2nd set of tires is selected.

  • When DTC C2174/74 is output together with DTC C2121/21, C2122/22, C2123/23 , C2124/24 and/or C2125/25, inspect and repair the trouble areas indicated by DTC C2174/74 first Click here.

Tech Tips

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

A003D6TE01

INSPECTION PROCEDURE

Note


  • 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 Click here after registration Click here 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.

PROCEDURE


  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.

        Tech Tips

        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.

        Tech Tips

        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 Click here.

    2. Turn the ignition switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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

    7. Display the "ID Tire Inflation Pressure" value for each wheel using the GTS.

    8. Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kg/cm2, 5.8 psi) within 30 seconds. If the "ID Tire Inflation Pressure" value displayed on the GTS does not change, the tire pressure warning valve and transmitter corresponding to the unchanged "ID Tire Inflation Pressure" value was the cause of the output DTC.

      Note


      • Identify the malfunctioning tire pressure warning valve and transmitter by repeatedly decreasing the tire pressure for each tire.

      • Record which "ID Tire Inflation Pressure" value corresponds to each tire.

      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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*

      Tech Tips


      • *: 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.

    9. Check the Data List.

      Note


      • 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.

    10. 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 transmitters are abnormal A
      All transmitters are normal B

    B

    END

    A

  3. CHECK TRANSMITTER ID


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

    6. 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 -

      Tech Tips


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

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

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

      A003G3UE01
      Text in Illustration
      *1 Tire Pressure Warning Valve and Transmitter *2 Transmitter ID (7-digit number)
      *3 White Resin Cover *4 Identification Mark
      *a Surface A *b Surface B

      Note

      Make sure to use a tire pressure warning valve and transmitter that has a white cover. Otherwise, ID registration cannot be performed.

    8. 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

    REGISTRATION OF TRANSMITTER ID Click here

    A

  4. REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER


    1. Replace the tire pressure warning valve and transmitter Click here.


    NEXT

  5. REGISTRATION OF TRANSMITTER ID


    1. Perform registration Click here.


    NEXT

  6. PERFORM INITIALIZATION


    1. Set the tire pressure to the specified value Click here.

    2. Perform initialization Click here.


    NEXT

  7. CONFIRM TIRE INFLATION PRESSURE (DATA LIST)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

    6. 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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 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)/ 900 kPa (9.2 kgf/cm2, 131 psi), Relative pressure (gauge)/ 800 kPa (8.2 kgf/cm2, 116 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*

      Tech Tips


      • *: 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

    B

    END

    A

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here