DTC    C2121/21    No Signal from Transmitter ID1

DTC    C2122/22    No Signal from Transmitter ID2

DTC    C2123/23    No Signal from Transmitter ID3

DTC    C2124/24    No Signal from Transmitter ID4

DTC    C2181/81    Transmitter ID1 not Received (Test Mode DTC)

DTC    C2182/82    Transmitter ID2 not Received (Test Mode DTC)

DTC    C2183/83    Transmitter ID3 not Received (Test Mode DTC)

DTC    C2184/84    Transmitter ID4 not Received (Test Mode DTC)

for Preparation Click here


DESCRIPTION

The tire pressure warning valves and transmitters that are installed in the tire and wheel assemblies measure the tire pressure of the tires. The measured values are transmitted to the tire pressure warning antenna and receiver on the body as radio waves and then sent to the tire pressure warning ECU. 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 turns on.
The tire pressure warning valve and transmitters constantly send radio waves to the tire pressure warning antenna and receiver.
Under the conditions below, the tire pressure warning antenna and receiver is unable to receive the signals from the tire pressure warning valves and transmitters, and a DTC is stored.
  1. Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.
  2. Devices using similar radio frequencies are used in the vehicle.
  3. The ID of the tire pressure warning valve and transmitter is mistyped during registration.
  4. A tire/wheel/transmitter from a different vehicle is installed.
  5. The parts, such as tire chains, window film which obstruct the radio signal of the tire pressure warning valve and transmitter.

HINT:
These DTCs are detected when the vehicle is driven and no signals are received for 20 minutes or more.
DTCs from C2121/21 to C2124/24 can only be cleared by using the tester or receiving the signal from the tire pressure warning valve and transmitter. DTCs from C2181/81 to C2184/84 can be cleared when the transmitter in the tire pressure warning valve and transmitter sends a forced transmission signal or test mode ends. DTCs from C2181/81 to C2184/84 are output only in test mode.

DTC Code
DTC Detection Condition
Trouble Area
C2121/21
C2122/22
C2123/23
C2124/24
When all conditions below are met:
  1. Tire pressure warning valve and transmitter is not in stop mode
  2. Signal is not received from tire pressure warning valve and transmitter when driving the vehicle at more than 8 km/h (5 mph) for 20 minutes or more
  1. Tire pressure warning valve and transmitter
  2. Tire pressure warning antenna and receiver
  3. Harness or connector
  4. Tire pressure warning ECU
C2181/81
C2182/82
C2183/83
C2184/84
Test mode procedure is performed.
  1. Tire pressure warning valve and transmitter
  2. Tire pressure warning antenna and receiver
  3. Harness or connector
  4. Tire pressure warning ECU

HINT:
It is necessary to perform the procedure to identify the tire pressure warning valve and transmitter that is malfunctioning because it cannot be identified by the output DTC.

WIRING DIAGRAM


C158876E01


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the Techstream and write them down before removal.
  2. It is necessary to perform initialization (Click here) after registration (Click here) of the transmitter IDs into the tire pressure warning ECU after the ECU and/or the tire pressure warning valve and transmitter has been replaced.
1.READ OUTPUT DTC (DTC C2174/74)

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and the Techstream on.

  1. Enter the following menus: Chassis / Tire Pressure Monitor / Trouble Codes.

  1. Read DTCs.

    Result 
    Result
    		Proceed to
    DTC C2174/74 is not output
    		A
    DTC C2174/74 is output
    		B

    NOTICE:
    When DTC C2174/74 is output, troubleshoot that DTC first. Then troubleshoot DTCs C2121/21 to C2124/24.


B
GO TO DTC C2174/74 (Click here)
A


2.CHECK FREQUENCY RECEIVING CONDITION

  1. Check if the vehicle is in conditions such as the ones described below:

    1. Facilities or devices that use similar radio frequencies are located in the vicinity of the vehicle.

      HINT:
      If the vehicle is located in areas described above, the tire pressure warning light may blink for a minute and turn on in a particular area.

    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.

      HINT:
      Radio frequency may be interrupted due to the surroundings, or devices installed by the user.


NG
CHECK IF ANY DEVICE IS INSTALLED BY USER
OK


3.IDENTIFY TRANSMITTER CORRESPONDING TO DTC

  1. Set the tire pressures to the appropriate specified value(s) (Click here).

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and the Techstream on.

  1. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

  1. 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 / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*
    ID 2 Tire Inflation Pressure
    		ID2 tire inflation pressure /
    min.: Absolute pressure / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*
    ID 3 Tire Inflation Pressure
    		ID3 tire inflation pressure /
    min.: Absolute pressure / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*
    ID 4 Tire Inflation Pressure
    		ID4 tire inflation pressure /
    min.: Absolute pressure / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*

    HINT:
    *: It may take about 5 to 6 minutes until the values are displayed.

  1. Rapidly reduce the tire pressure for each tire at least 40 kPa (0.4 kgf/cm2, 5.8 psi) within 30 seconds.

  1. Check the Data List.

    NOTICE:
    1. It may take about 5 to 6 minutes to display the updated tire pressure data.
    2. When no "ID Tire Inflation Pressure" data has changed, reset the tire pressure to the appropriate specified value and rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.
    3. Record the "ID Tire Inflation Pressure" data transmitter ID that corresponds to each tire.

  1. After confirming that the "ID Tire Inflation Pressure" data for one tire (ID1 to ID4) has changed, repeat this procedure for the other tires. Identify the transmitter that corresponds to the DTC.

    Result 
    Condition
    		Proceed to
    All abnormal
    		A
    One or more transmitters are abnormal
    		B
    All normal
    		C


B
Go to step 5

C
END
A


4.CHECK HARNESS AND CONNECTOR (ECU - RECEIVER)

  1. Disconnect the J31 ECU connector.

  1. Disconnect the P17 receiver connector.



    E136995E15

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J31-12 (RDA) - P17-1 (RDA)
    		Always
    		Below 1 Ω
    J31-11 (GND2) - P17-4 (GND)
    		Always
    		Below 1 Ω
    J31-6 (RF5V) - P17-5 (+5V)
    		Always
    		Below 1 Ω
    J31-12 (RDA) - Body ground
    		Always
    		10 kΩ or higher
    J31-11 (GND2) - Body ground
    		Always
    		10 kΩ or higher
    J31-6 (RF5V) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK TRANSMITTER ID

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and the Techstream on.

  1. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

  1. Check the values by referring to the table below.

    Tire Pressure Monitor 
    Tester Display
    		Measurement Item/Display
    		Normal Condition
    		Diagnostic Note
    Registered ID1 Code
    		Registered ID1 code/
    min.: 0
    max.: FFFFFFFF*
    		The transmitter ID registered in the transmitter ID1 is displayed
    		*: Displayed only when the transmitter ID is not registered.
    Registered ID2 Code
    		Registered ID2 code/
    min.: 0
    max.: FFFFFFFF*
    		The transmitter ID registered in the transmitter ID2 is displayed
    		*: Displayed only when the transmitter ID is not registered.
    Registered ID3 Code
    		Registered ID3 code/
    min.: 0
    max.: FFFFFFFF*
    		The transmitter ID registered in the transmitter ID3 is displayed
    		*: Displayed only when the transmitter ID is not registered.
    Registered ID4 Code
    		Registered ID4 code/
    min.: 0
    max.: FFFFFFFF*
    		The transmitter ID registered in the transmitter ID4 is displayed
    		*: Displayed only when the transmitter ID is not registered.


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


    C156141E01

  1. Confirm that the transmitter ID on the transmitter and recorded transmitter ID match.

    Result 
    Result
    		Proceed to
    Match
    		A
    Do not match
    		B


B
Go to step 7
A


6.REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

  1. Replace the tire pressure warning valve and transmitter (Click here).


NEXT


7.REGISTRATION OF TRANSMITTER ID

  1. Perform registration (Click here).


NEXT


8.PERFORM INITIALIZATION

  1. Perform initialization (Click here).


NEXT


9.CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and the Techstream on.

  1. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

  1. 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 / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*
    ID 2 Tire Inflation Pressure
    		ID2 tire inflation pressure /
    min.: Absolute pressure / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*
    ID 3 Tire Inflation Pressure
    		ID3 tire inflation pressure /
    min.: Absolute pressure / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*
    ID 4 Tire Inflation Pressure
    		ID4 tire inflation pressure /
    min.: Absolute pressure / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*

    HINT:
    1. *: It may take about 5 to 6 minutes until the values are displayed.
    2. When no "ID Tire Inflation Pressure" has changed, rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.

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


B
END
A


10.REPLACE TIRE PRESSURE WARNING ANTENNA AND RECEIVER

  1. Replace the tire pressure warning antenna and receiver (Click here).


NEXT


11.CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON and the Techstream on.

  1. Enter the following menus: Chassis / Tire Pressure Monitor / Data List.

  1. 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 / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*
    ID 2 Tire Inflation Pressure
    		ID2 tire inflation pressure /
    min.: Absolute pressure / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*
    ID 3 Tire Inflation Pressure
    		ID3 tire inflation pressure /
    min.: Absolute pressure / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*
    ID 4 Tire Inflation Pressure
    		ID4 tire inflation pressure /
    min.: Absolute pressure / 100.00 kPa (1 kgf/cm2, 14 psi), Relative pressure / 0 kPa (0 kgf/cm2, 0 psi)
    max.: Absolute pressure / 449.35 kPa (4.5 kgf/cm2, 63 psi), Relative pressure / 349.35 kPa (3.6 kgf/cm2, 51 psi)
    		Actual tire inflation pressure
    		If 100 kPa (1 kgf/cm2, 14 psi) for the absolute pressure or 0 kPa (0 kgf/cm2, 0 psi) is displayed for the relative pressure, the data has not been received.*

    HINT:
    1. *: It may take about 5 to 6 minutes until the values are displayed.
    2. When no "ID Tire Inflation Pressure" has changed, rotate the tire 90 to 270°. Then rapidly release the tire pressure and recheck it.

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


B
END
A

REPLACE TIRE PRESSURE WARNING ECU (Click here)