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 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 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.


Tech Tips

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: for FMVSS138 Type

  • *2: for ECE-R64 Type

DTCs from C2121/21 to C2124/24 (C2125/25: w/ Spare Tire) can only be cleared by using the GTS. DTCs from C2181/81 to C2184/84 (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 (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*3

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 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:


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

  • No transmitter ID is received from tire pressure warning valve and transmitters for 20 minutes*1 (10 minutes*2) or more.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning antenna (for Roof Side)

  • Tire pressure warning antenna (for Front Side)*2

  • Harness or connector

  • Tire pressure warning ECU and receiver

C2181/81

C2182/82

C2183/83

C2184/84

C2185/85*3

 Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning antenna (for Roof Side)

  • Tire pressure warning antenna (for Front Side)*2

  • Harness or connector

  • Tire pressure warning ECU and receiver

Note

w/ ID Switching Function:

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

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

A01GISGE03

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. CHECK TEST MODE DTC (C2195/95)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

    6. Perform the test mode inspection Click here.

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

    B

    GO TO DTC C2195/95 Click here

    A

  3. IDENTIFY TRANSMITTER CORRESPONDING TO DTC


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

    2. Turn the engine switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch 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
      ID 1 Tire Inflation Pressure

      ID1 tire inflation pressure/

      min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 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 / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 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 / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 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 / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*1
      ID 5 Tire Inflation Pressure

      ID5 tire inflation pressure/

      min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure*2 If N/A is displayed, data has not been received.*1, *2

      Tech Tips


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

      • *2: w/ Spare Tire

    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 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

  4. CHECK TRANSMITTER ID


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch 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 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

      Registered ID5 code/

      min.: 0, max.: FFFFFFF*1

      		 ID No. registered for transmitter ID5 displayed*2 -

      Tech Tips


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

      • *2: w/ Spare Tire

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

      A01GMYUE01
      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

  5. REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER


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


    NEXT

  6. REGISTRATION OF TRANSMITTER ID


    1. Perform registration Click here.


    NEXT

  7. PERFORM INITIALIZATION


    1. Perform initialization Click here.


    NEXT

  8. CONFIRM TIRE INFLATION PRESSURE (DATA LIST)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch 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
      ID 1 Tire Inflation Pressure

      ID1 tire inflation pressure/

      min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 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 / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 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 / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 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 / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure If N/A is displayed, data has not been received.*1
      ID 5 Tire Inflation Pressure

      ID5 tire inflation pressure/

      min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)

      max.: Absolute pressure / 488.72 kPa (4.9 kgf/cm2, 70 psi), Relative pressure / 388.72 kPa (3.9 kgf/cm2, 56 psi)

      		 Actual tire inflation pressure*2 If N/A is displayed, data has not been received.*1, *2

      Tech Tips


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

      • *2: w/ Spare Tire

      • 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

    B

    END

    A

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here