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Home >> Toyota >> 2018 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Suspension >> Wheels & Tire System >> Tire Pressure Warning System- Diagnostic Codes & Circuit Tests >> Tire Pressure Warning System >> DTC C2121: Transmitter ID 1 not Received (Main); DTC C2122: No Signal from Transmitter ID2; DTC C2123: No Signal from Transmitter ID3; DTC C2124: No Signal from Transmitter ID4; DTC C2125: No Signal from Transmitter ID5; DTC C2181: Transmitter ID1 not Received (Test Mode DTC); DTC C2182: Transmitter ID2 not Received (Test Mode DTC); DTC C2183: Transmitter ID3 not Received (Test Mode DTC); DTC C2184: Transmitter ID4 not Received (Test Mode DTC); DTC C2185: Transmitter ID5 not Received (Test Mode DTC) [08/2021 - ] >> Procedure
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DTC C2121: Transmitter ID 1 not Received (Main); DTC C2122: No Signal from Transmitter ID2; DTC C2123: No Signal from Transmitter ID3; DTC C2124: No Signal from Transmitter ID4; DTC C2125: No Signal from Transmitter ID5; DTC C2181: Transmitter ID1 not Received (Test Mode DTC); DTC C2182: Transmitter ID2 not Received (Test Mode DTC); DTC C2183: Transmitter ID3 not Received (Test Mode DTC); DTC C2184: Transmitter ID4 not Received (Test Mode DTC); DTC C2185: Transmitter ID5 not Received (Test Mode DTC) [08/2021 - ]: 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.

        HINT: 

        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.

        HINT: 

        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

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  2

  2. CONFIRM OUTPUT DTC 
    1. Check the stored DTC.

      Result

      Result Proceed to
      Any DTCs from C2121 to C2124 (C2125: w/ Spare Tire Pressure Warning Valve and Transmitter) are output (C2181 to C2184 (C2185: w/ Spare Tire Pressure Warning Valve and Transmitter) when in Test Mode) A
      All DTCs from C2121 to C2124 (C2125: w/ Spare Tire Pressure Warning Valve and Transmitter) are output (C2181 to C2184 (C2185: w/ Spare Tire Pressure Warning Valve and Transmitter) when in Test Mode) B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  3. IDENTIFY TRANSMITTER CORRESPONDING TO DTC (TIRE POSITION) 
    1. Turn the ignition switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.
    6. Display the "ID Tire Position" value for each wheel using the Techstream.
    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.
      ID 5 Tire Position ID5 Tire Position No Information or FL or FR or RL or RR or Spare or Judging ID5 tire position is displayed
      • If no tire position information is stored, "No Information" will be displayed.
      • w/ Spare Tire Pressure Warning Valve and Transmitter

      HINT: 

      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)
      C2125*1 No Signal from Transmitter ID5 Registered ID 5 code
      C2185*1 Transmitter ID 5 not Received (for Test Diagnosis)

      *1: w/ Spare Tire Pressure Warning Valve and Transmitter

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK TRANSMITTER ID 
    1. Turn the ignition switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream 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*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 w/ Spare Tire Pressure Warning Valve and Transmitter

      HINT: 

      • *1: Displayed only when the ID No. is not registered.
      • The wheel position cannot be determined from ID1 through ID5 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)
        C2125*2 No Signal from Transmitter ID5 Registered ID 5 code
        C2185*2 Transmitter ID 5 not Received (for Test Diagnosis)

        *2: w/ Spare Tire Pressure Warning Valve and Transmitter

    7. Disassemble the tire indicated in the output DTC and check the tire pressure warning valve and transmitter ID.
      GTY1026863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for Type A *B for Type B
      *1 Tire Pressure Warning Valve and Transmitter - -
      *a 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

    Result: 

    A 

    REPLACE CORRESPONDING TIRE PRESSURE WARNING VALVE AND TRANSMITTER. Refer to  REMOVAL [08/2021 - ] 

    Result: 

    B 

    See step  7

  5. TEST MODE INSPECTION (C2181 to C2184 (C2185: w/ Spare Tire Pressure Warning Valve and Transmitter)) 
    1. Perform a test mode inspection and perform Transmitter Data Reception Check (C2181 to C2184 (C2185: w/ Spare Tire Pressure Warning Valve and Transmitter)).

      Refer to TEST MODE PROCEDURE [08/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END 

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

    Result: 

    NG 

    See step  6

  6. CHECK TIRE PRESSURE WARNING VALVE AND TRANSMITTER 
    1. Turn the ignition switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream 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*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 w/ Spare Tire Pressure Warning Valve and Transmitter

      HINT: 

      • *1: Displayed only when the ID No. is not registered.
      • The wheel position cannot be determined from ID1 through ID5 on the Data List.
    7. Disassemble all of the tires and check the tire pressure warning valve and transmitter IDs.
      GTY1026863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for Type A *B for Type B
      *1 Tire Pressure Warning Valve and Transmitter - -
      *a 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

    Result: 

    A 

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [08/2019 - 08/2022]  , or refer to  REMOVAL [08/2022 - ] 

    Result: 

    B 

    See step  7

  7. REGISTRATION OF TRANSMITTER ID 
    1. Perform registration.

      Refer to REGISTRATION [08/2021 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. PERFORM INITIALIZATION 
    1. Perform initialization.

      Refer to INITIALIZATION [08/2019 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. CLEAR DTC 
    1. Clear the DTCs.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  10. CLEAR DTC 
    1. Clear the DTCs.

      Result

      Proceed to
      NEXT

    Result: 

    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.

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