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

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
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)

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 on the body 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 assembly 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 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 set.

DTCs from C2121/21 to C2124/24 can only be cleared by using the GTS. DTCs from C2181/81 to C2184/84 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 are output only in test mode.

DTC No. DTC Detection Condition Trouble Area

C2121/21

C2122/22

C2123/23

C2124/24

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 ECU and receiver

C2181/81

C2182/82

C2183/83

C2184/84

 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 (w/ ID Switching Function).

  • When DTCs C2121/21 to C2124/24 are set, DTC C2179/79 may be set simultaneously. In such cases, troubleshoot DTCs C2121/21 to C2124/24 first, then troubleshoot DTC C2179/79.

Tech Tips

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

WIRING DIAGRAM

A01V16EE17

CAUTION / NOTICE / HINT

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 (See page ) 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 values Click here.

    2. Turn the ignition switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON (IG).

    5. Turn the GTS on.

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

    7. Check the values by referring to the table below.

      Tire Pressure Monitor
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ID1 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) / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID2 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) / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID3 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) / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID4 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) / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 388.72 kPa (3.9 kgf/cm2, 56 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.

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

    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 (ID1 to ID4) 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

    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 (IG).

    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 ID1 code

      Registered ID1 code/

      min.: 0

      max.: FFFFFFF*

      		 ID No. registered for transmitter ID1 displayed -
      Registered ID2 code

      Registered ID2 code/

      min.: 0

      max.: FFFFFFF*

      		 ID No. registered for transmitter ID2 displayed -
      Registered ID3 code

      Registered ID3 code/

      min.: 0

      max.: FFFFFFF*

      		 ID No. registered for transmitter ID3 displayed -
      Registered ID4 code

      Registered ID4 code/

      min.: 0

      max.: FFFFFFF*

      		 ID No. registered for transmitter ID4 displayed -

      Tech Tips

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

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

      A01V04VE01
      Text in Illustration
      *1 Tire pressure warning valve and transmitter *2 Transmitter ID (7-digit number)

    8. Confirm that the ID number on the transmitter and 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. 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 (IG).

    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
      ID1 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) / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID2 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) / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID3 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) / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*
      ID4 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) / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure (Gauge) / 388.72 kPa (3.9 kgf/cm2, 56 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.

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

    A

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    B

    END