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

DTC Code DTC Name
C2121 No Signal from Transmitter ID1
C2122 No Signal from Transmitter ID2
C2123 No Signal from Transmitter ID3
C2124 No Signal from Transmitter ID4
C2181 Transmitter ID1 not Received (Test Mode DTC)
C2182 Transmitter ID2 not Received (Test Mode DTC)
C2183 Transmitter ID3 not Received (Test Mode DTC)
C2184 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 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 are stored.

DTCs C2121 to C2124 can only be cleared by using the GTS. DTCs C2181 to C2184 can be cleared when the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs C2181 to C2184 are output only in test mode.


  • *1: for FMVSS138 Type

  • *2: for ECE-R64 Type, for Latin America or for GVF50L-AEVGHC

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C2121 No Signal from Transmitter ID1

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 No Signal from Transmitter ID2

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 No Signal from Transmitter ID3

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 No Signal from Transmitter ID4

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

 -
C2181 Transmitter ID1 not Received (Test Mode DTC) Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2182 Transmitter ID2 not Received (Test Mode DTC) Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2183 Transmitter ID3 not Received (Test Mode DTC) Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -
C2184 Transmitter ID4 not Received (Test Mode DTC) Test mode procedure is performed.

  • Tire pressure warning valve and transmitter

  • Tire pressure warning ECU and receiver

 -

Note


  • When DTCs C2121 to C2124 are set, DTC C2179 may be set simultaneously. In such cases, troubleshoot DTCs C2121 to C2124 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 and C2124 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 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

Click here

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
      Result Proceed to
      There is no device or facility that uses electrical waves of approximately the same frequency in the vicinity of the vehicle or inside the vehicle. A
      There is a device or facility that uses electrical waves of approximately the same frequency in the vicinity of the vehicle or inside the vehicle. B

    B

    CLEAR DTC Click here

    A

  2. CONFIRM OUTPUT DTC


    1. Check the stored DTC.

      Result
      Result Proceed to
      Any DTCs from C2121 to C2124 are output (C2181 to C2184 when in Test Mode) A
      All DTCs from C2121 to C2124 are output (C2181 to C2184 when in Test Mode) B

    B

    TEST MODE INSPECTION (C2181, C2182, C2183, C2184) Click here

    A

  3. IDENTIFY TRANSMITTER CORRESPONDING TO DTC (TIRE POSITION)


    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. Display the "ID Tire Position" value for each wheel using the GTS.

    7. Refer to the following chart and check the wheel position of the DTC and transmitter match.


      Chassis > Tire Pressure Monitor > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      ID 1 Tire Position ID1 Tire Position No Information or FL or FR or RL or RR or Spare or Judging ID1 tire position is displayed If no tire position information is stored, "No Information" will be displayed.
      ID 2 Tire Position ID2 Tire Position No Information or FL or FR or RL or RR or Spare or Judging ID2 tire position is displayed If no tire position information is stored, "No Information" will be displayed.
      ID 3 Tire Position ID3 Tire Position No Information or FL or FR or RL or RR or Spare or Judging ID3 tire position is displayed If no tire position information is stored, "No Information" will be displayed.
      ID 4 Tire Position ID4 Tire Position No Information or FL or FR or RL or RR or Spare or Judging ID4 tire position is displayed If no tire position information is stored, "No Information" will be displayed.

      Tech Tips

      Refer to the following chart for the Data List items that correspond to the DTCs.

      DTC No. Detection Item Data List
      C2121 No Signal from Transmitter ID1 ID1 Tire Position
      C2181 Transmitter ID 1 not Received (for Test Diagnosis)
      C2122 No Signal from Transmitter ID2 ID2 Tire Position
      C2182 Transmitter ID 2 not Received (for Test Diagnosis)
      C2123 No Signal from Transmitter ID3 ID3 Tire Position
      C2183 Transmitter ID 3 not Received (for Test Diagnosis)
      C2124 No Signal from Transmitter ID4 ID4 Tire Position
      C2184 Transmitter ID 4 not Received (for Test Diagnosis)

      Chassis > Tire Pressure Monitor > Data List
      Tester Display
      ID 1 Tire Position
      ID 2 Tire Position
      ID 3 Tire Position
      ID 4 Tire Position
      Result
      Proceed to
      NEXT

    NEXT

  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. Refer to the following chart and record the tire pressure warning valve and transmitter ID of the output DTC.


      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 -

      Tech Tips


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

      • The wheel position cannot be determined from ID1 through ID4 on the Data List.

      • Refer to the following chart for the Data List items that correspond to the DTCs.

        DTC No. Detection Item Data List
        C2121 No Signal from Transmitter ID1 Registered ID 1 code
        C2181 Transmitter ID 1 not Received (for Test Diagnosis)
        C2122 No Signal from Transmitter ID2 Registered ID 2 code
        C2182 Transmitter ID 2 not Received (for Test Diagnosis)
        C2123 No Signal from Transmitter ID3 Registered ID 3 code
        C2183 Transmitter ID 3 not Received (for Test Diagnosis)
        C2124 No Signal from Transmitter ID4 Registered ID 4 code
        C2184 Transmitter ID 4 not Received (for Test Diagnosis)

      Chassis > Tire Pressure Monitor > Data List
      Tester Display
      Registered ID 1 Code
      Registered ID 2 Code
      Registered ID 3 Code
      Registered ID 4 Code

    7. Disassemble the tire indicated in the output DTC and check the tire pressure warning valve and transmitter ID.

      B004UWIC01
      *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

    A

    REPLACE CORRESPONDING TIRE PRESSURE WARNING VALVE AND TRANSMITTER Click here

    B

    GO TO STEP 7 Click here

  5. TEST MODE INSPECTION (C2181, C2182, C2183, C2184)


    1. Perform a test mode inspection and perform a send data check (C2181, C2182, C2183, C2184).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    END Explain to the customer that there is a high possibility that a DTC was output due to temporary electrical wave interference.

    NG

  6. CHECK TIRE PRESSURE WARNING VALVE AND TRANSMITTER


    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. Refer to the following chart and record all of the tire pressure warning valve and transmitter IDs.


      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 -

      Tech Tips


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

      • The wheel position cannot be determined from ID1 through ID4 on the Data List.


      Chassis > Tire Pressure Monitor > Data List
      Tester Display
      Registered ID 1 Code
      Registered ID 2 Code
      Registered ID 3 Code
      Registered ID 4 Code

    7. Disassemble all of the tires and check the tire pressure warning valve and transmitter IDs.

      B004UWIC01
      *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

    A

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER except RHD and w/ Light Auto Turn-off System (w/ Delay Function): REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here
    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER for RHD and w/ Light Auto Turn-off System (w/ Delay Function): REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    B

  7. REGISTRATION OF TRANSMITTER ID


    1. Perform ID registration for the tire pressure warning valve and receiver.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. PERFORM INITIALIZATION


    1. Set the tire pressure to the specified value.

      Click here

    2. Initialize the tire pressure warning system.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Chassis > Tire Pressure Monitor > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

    END

  10. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Chassis > Tire Pressure Monitor > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

    END Explain to the customer that there is a high possibility that a device (located near or inside the vehicle) or facility using electrical waves of approximately the same frequency is causing electrical wave interference.