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Home >> Toyota >> 2021 >> RAV4 Adventure >> Repair and Diagnosis (Single Page) >> Suspension >> Wheels & Tire System >> Tire Pressure Warning System - Diagnostic Codes (1 Of 2) >> Tire Pressure Warning System >> DTC C2121: No Signal from Transmitter ID1; 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) [11/2018 - 10/2019] >> Procedure
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DTC C2121: No Signal from Transmitter ID1; 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) [11/2018 - 10/2019]: 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  12

    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/ Full Size Spare Tire) are output (C2181 to C2184 (C2185: w/ Full Size Spare Tire) when in Test Mode) A
      All DTCs from C2121 to C2124 (C2125: w/ Full Size Spare Tire) are output (C2181 to C2184 (C2185: w/ Full Size Spare Tire) when in Test Mode) B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  3

  3. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      w/ Tire Inflation Pressure Display Function A
      w/o Tire Inflation Pressure Display Function B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  4

  4. 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.
      • w/ Tire Inflation Pressure Display Function
      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.
      • w/ Tire Inflation Pressure Display Function
      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.
      • w/ Tire Inflation Pressure Display Function
      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.
      • w/ Tire Inflation Pressure Display Function
      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/ Tire Inflation Pressure Display Function
      • w/ Full Size Spare Tire

      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 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)
      C2125* No Signal from Transmitter ID5 ID5 Tire Position
      C2185* Transmitter ID 5 not Received (for Test Diagnosis)

      *: w/ Full Size Spare Tire

      Chassis > Tire Pressure Monitor > Data List 

      Tester Display
      ID 1 Tire Position
      ID 2 Tire Position
      ID 3 Tire Position
      ID 4 Tire Position
      ID 5 Tire Position

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  5. IDENTIFY TRANSMITTER CORRESPONDING TO DTC (TIRE POSITION) 
    1. Set the tire pressure to the specified value.

      Refer to INSPECTION [11/2018 - 02/2019] , or refer to INSPECTION [02/2019 - 10/2019]

    2. Turn the ignition switch off.
    3. Connect the Techstream to the DLC3.
    4. Turn the ignition switch to ON.
    5. Turn the Techstream 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 Techstream.

      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/cm 2 , 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm 2 , 0 psi)
      max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm 2 , 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/cm 2 , 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/cm 2 , 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm 2 , 0 psi)
      max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm 2 , 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/cm 2 , 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/cm 2 , 0 psi), Relative pressure (Gauge)/ 0 kPa (0 kgf/cm 2 , 0 psi)
      max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm 2 , 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/cm 2 , 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/cm 2 , 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm 2 , 0 psi)
      max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm 2 , 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/cm 2 , 55 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 (abs) / 0 kPa (0 kgf/cm 2 , 0 psi), Relative pressure (Gauge) / 0 kPa (0 kgf/cm 2 , 0 psi)
      max.: Absolute pressure (abs) / 480 kPa (4.9 kgf/cm 2 , 70 psi), Relative pressure (Gauge) / 380 kPa (3.9 kgf/cm 2 , 55 psi)      		 Actual tire inflation pressure
      • If N/A is displayed, data has not been received.*1
      • *2

      HINT: 

      • *1: It may take a few minutes until the values are displayed.
      • *2: w/ Full Size Spare Tire

      Chassis > Tire Pressure Monitor > Data List 

      Tester Display
      ID 1 Tire Inflation Pressure
      ID 2 Tire Inflation Pressure
      ID 3 Tire Inflation Pressure
      ID 4 Tire Inflation Pressure
      ID 5 Tire Inflation Pressure
    8. Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.4 kg/cm 2 , 5.8 psi) within 30 seconds. If the "ID Tire Inflation Pressure" value displayed on the Techstream 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.

      HINT: 

      • 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.
    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 for each tire. Identify the transmitter that corresponds to the DTC.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. 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 *2

      HINT: 

      • *1: Displayed only when the ID No. is not registered.
      • *2: w/ Full Size Spare Tire
      • 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* No Signal from Transmitter ID5 Registered ID 5 code
        C2185* Transmitter ID 5 not Received (for Test Diagnosis)

        *: w/ Full Size Spare Tire

      Chassis > Tire Pressure Monitor > Data List 

      Tester Display
      Registered ID 1 Code
      Registered ID 2 Code
      Registered ID 3 Code
      Registered ID 4 Code
      Registered ID 5 Code
    7. Disassemble the tire indicated in the output DTC and check the tire pressure warning valve and transmitter ID.
      GTY898044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A except TMMC Made, and for TMMC Made w/ Smart Key System - -
      *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.

      GTY872061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for TMMC Made w/o Smart Key System - -
      *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 [11/2018 - 10/2019]

    Result: 

    B 

    See step  9

  7. TEST MODE INSPECTION (C2181 to C2184 (C2185: w/ Full Size Spare Tire)) 
    1. Perform a test mode inspection and perform Transmitter Data Reception Check (C2181 to C2184 (C2185: w/ Full Size Spare Tire)).

      Refer to TEST MODE PROCEDURE [11/2018 - 12/2021]

      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  8

  8. 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 *2

      HINT: 

      • *1: Displayed only when the ID No. is not registered.
      • *2: w/ Full Size Spare Tire
      • The wheel position cannot be determined from ID1 through ID5 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
      Registered ID 5 Code
    7. Disassemble all of the tires and check the tire pressure warning valve and transmitter IDs.
      GTY898044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A except TMMC Made, and for TMMC Made w/ Smart Key System - -
      *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.

      GTY872061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for TMMC Made w/o Smart Key System - -
      *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 [11/2018 - 10/2023]

    Result: 

    B 

    See step  9

  9. REGISTRATION OF TRANSMITTER ID 
    1. Perform registration.

      Refer to REGISTRATION [11/2018 - 10/2019]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  10

  10. PERFORM INITIALIZATION 
    1. Perform initialization.

      Refer to INITIALIZATION [11/2018 - 12/2021]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  11

  11. CLEAR DTC 
    1. Clear the DTCs.

      Chassis > Tire Pressure Monitor > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  12. CLEAR DTC 
    1. Clear the DTCs.

      Chassis > Tire Pressure Monitor > Clear 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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