TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2121, C2122, C2123, C2124, C2125, C2181, C2182, C2183, C2184, C2185

DTC Code DTC Name
C2121 Transmitter ID 1 not Received (Main)
C2122 Transmitter ID 2 not Received (Main)
C2123 Transmitter ID 3 not Received (Main)
C2124 Transmitter ID 4 not Received (Main)
C2125 Transmitter ID 5 not Received (Main)
C2181 Transmitter ID 1 not Received (for Test Diagnosis)
C2182 Transmitter ID 2 not Received (for Test Diagnosis)
C2183 Transmitter ID 3 not Received (for Test Diagnosis)
C2184 Transmitter ID 4 not Received (for Test Diagnosis)
C2185 Transmitter ID 5 not Received (for Test Diagnosis)

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 40 km/h (25 mph), or no transmitter ID is received from all of the tire pressure warning valve and transmitters for 20 minutes*1 (10 minutes*2) or more, DTCs from C2121 to C2124 (C2121 to C2125: w/ Spare Tire) are stored.

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


  • *1: for FMVSS138 Type

  • *2: for ECE-R64 Type

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C2121 Transmitter ID 1 not Received (Main)

Either of the following conditions (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 20 minutes*1 (10 minutes*2) 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 20 minutes*1 (10 minutes*2) or more.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2122 Transmitter ID 2 not Received (Main)

Either of the following conditions (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 20 minutes*1 (10 minutes*2) 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 20 minutes*1 (10 minutes*2) or more.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2123 Transmitter ID 3 not Received (Main)

Either of the following conditions (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 20 minutes*1 (10 minutes*2) 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 20 minutes*1 (10 minutes*2) or more.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2124 Transmitter ID 4 not Received (Main)

Either of the following conditions (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 20 minutes*1 (10 minutes*2) 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 20 minutes*1 (10 minutes*2) or more.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2125 Transmitter ID 5 not Received (Main)

Either of the following conditions (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 20 minutes*1 (10 minutes*2) 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 20 minutes*1 (10 minutes*2) or more.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 w/ Spare Tire
C2181 Transmitter ID 1 not Received (for Test Diagnosis) Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2182 Transmitter ID 2 not Received (for Test Diagnosis) Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2183 Transmitter ID 3 not Received (for Test Diagnosis) Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2184 Transmitter ID 4 not Received (for Test Diagnosis) Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2185 Transmitter ID 5 not Received (for Test Diagnosis) Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 w/ Spare Tire

Note


  • When DTCs C2121 to C2124 (C2121 to C2125: w/ Spare Tire) are set, DTC C2179 may be set simultaneously. In such cases, troubleshoot DTCs C2121 to C2124 (C2121 to C2125: w/ Spare Tire) first, then troubleshoot DTC C2179.

  • If the GTS is used to display the ECU Data List for 10 minutes or more, DTCs C2121, C2122, C2123, C2124 and C2125 (w/ Spare Tire) are stored to the tire pressure warning ECU.

    If these DTCs are stored, clear the DTCs using the GTS.

  • If any of the DTCs from C2121 to C2124 (C2121 to C2125: w/ Spare Tire) is output, clear the DTCs or drive at 40 km/h (25 mph) for 1 minute or more.

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

B001GGSE02

CAUTION / NOTICE / HINT

Note


  • When replacing the tire pressure warning ECU and receiver, first use the GTS to record all of the current IDs and registered tires with transmitters (4 or 5 tires) of the tire pressure warning valve and transmitter registered to the tire pressure warning ECU and receiver.

  • It is necessary to perform initialization 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 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 transmissions may be interrupted due to the surroundings or devices installed by the user.

      Result
      Proceed to
      OK
      NG

    NG

    CLEAR DTC Click here

    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.

      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.

      Chassis > Tire Pressure Monitor > Data List
      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.*
      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.*
      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.*
      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.*
      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) / 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.*

      • w/ Spare Tire

      Tech Tips


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

      • The wheel position cannot be determined from ID1 through ID4 or ID1 through ID5 (w/ Spare Tire) on the Data List.

    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.

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

    B

    CLEAR DTC Click here

    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.

      Chassis > Tire Pressure Monitor > Data List
      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 w/ Spare Tire

      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.

      B001C9XC04
      *1 Tire Pressure Warning Valve and Transmitter - -
      *a Transmitter ID (7-digit Number) *b Wheel Speed Type Tire Inflation Pressure Display Function Identification Mark

      Note

      For vehicles equipped with the wheel speed type tire inflation pressure display function, be sure to use tire pressure warning valve and transmitters with identification marks.

    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

    GO TO STEP 5 Click here

    A

  4. REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER


    1. Replace the tire pressure warning valve and transmitter.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. REGISTRATION OF TRANSMITTER ID


    1. Perform registration.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. PERFORM INITIALIZATION


    1. Perform initialization.

      Click here

      Result
      Proceed to
      NEXT

    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.

      Chassis > Tire Pressure Monitor > Data List
      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.*
      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.*
      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.*
      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.*
      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) / 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.*

      • w/ Spare Tire

      Tech Tips


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

      • The wheel position cannot be determined from ID1 through ID4 or ID1 through ID5 (w/ Spare Tire) on the Data List.

      • 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

    A

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER for 3 door: Click here
    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER for 5 door: Click here

    B

  8. CLEAR DTC


    1. Clear the DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END

  9. CLEAR DTC


    1. Clear the DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END Adjust the pressure of the tires to the standard value.

  10. CLEAR DTC


    1. Clear the DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    END Explain to the customer that a device near the vehicle using electrical waves of approximately the same frequency may be causing electrical wave interference.