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 pressure of each wheel. The measured values are transmitted to the tire pressure warning ECU and receiver in the vehicle as radio waves. The ECU compares the measured tire pressure values with the tire pressure threshold. When the measured tire 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 20 minutes*1 (10 minutes*2) or more while the vehicle speed is more than 37 km/h (23 mph), a DTC from C2121/21 to C2124/24 (C2125/25: w/ Full Size Spare Tire) is stored.

DTCs C2121/21 to C2124/24 (C2125/25: w/ Full Size Spare Tire) can only be cleared by using the GTS. DTCs C2181/81 to C2184/84 (C2185/85: w/ Full Size Spare Tire) can be cleared when the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs C2181/81 to C2184/84 (C2185/85: w/ Full Size Spare Tire) are output only in test mode.

*1: for FMVSS138 Type

*2: for ECE-R64 Type

DTC No. DTC Detection Condition Trouble Area

C2121/21

C2122/22

C2123/23

C2124/24

C2125/25*3

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 37 km/h (23 mph) or no vehicle speed signal is received for 20 minutes*1 (10 minutes*2) or more.


  • Tire pressure warning valve and transmitter

  • 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 ECU and receiver

*1: for FMVSS138 Type

*2: for ECE-R64 Type

*3: w/ Full Size Spare Tire

Note

When any DTC from C2121/21 to C2124/24 (C2125/25: w/ Full Size Spare Tire) is stored, DTC C2179/79 may be stored simultaneously. In such cases, troubleshoot DTC C2179/79 first, then troubleshoot DTCs C2121/21 to C2124/24 (C2125/25: w/ Full Size Spare Tire).

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

A01NMQ4E02

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 following conditions are not met:


      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 illuminate after blinking for 1 minute due to interfering radio frequencies.

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


    NG
    OK
  2. CHECK TEST MODE DTC (C2195/95)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power 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
    A
  3. IDENTIFY TRANSMITTER CORRESPONDING TO DTC


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

    2. Turn the power switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG).

    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.

      Tech Tips


      • 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) / 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

      Tech Tips


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

      • *2: w/ Full Size Spare Tire

    9. Check the Data List.

      Note


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

      • When an "ID Tire Inflation Pressure" value 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 value.

      • Record the transmitter IDs and positions of transmitters that are normal.

    10. After confirming that the "ID Tire Inflation Pressure" value 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 transmitter is abnormal A
      All transmitters are normal B

    B
    A
  4. CHECK TRANSMITTER ID


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power 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*2

      Registered ID5 code/

      min.: 0

      max.: FFFFFFF*1

      ID No. registered for transmitter ID5 displayed -

      Tech Tips


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

      • *2: w/ Full Size Spare Tire

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

      A01NM4YE01
      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
    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 power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power 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 (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

      Tech Tips


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

      • *2: w/ Full Size Spare Tire

      • When an "ID Tire Inflation Pressure" value 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 value.

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

    B
    A