Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

Suspension. Yaris. Ncp93, 131
Tire Pressure Monitoring. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ OUTPUT DTC (DTC C2173/73)

CHECK FREQUENCY RECEIVING CONDITION

IDENTIFY TRANSMITTER CORRESPONDING TO DTC

CHECK HARNESS AND CONNECTOR (ECU - RECEIVER)

CHECK TRANSMITTER ID

REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

REGISTRATION OF TRANSMITTER ID

CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

REPLACE TIRE PRESSURE WARNING ANTENNA AND RECEIVER

CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

DTC C2121/21 No Signal from Transmitter ID1 in Main Mode

DTC C2122/22 No Signal from Transmitter ID2 in Main Mode

DTC C2123/23 No Signal from Transmitter ID3 in Main Mode

DTC C2124/24 No Signal from Transmitter ID4 in Main Mode

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)


DESCRIPTION

The tire pressure warning valves and transmitters that are installed in the tire and wheel assemblies measure the air 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 air pressure values with the air pressure threshold. When the measured air pressure value is less than this threshold, the warning light in the combination meter turns on.
The tire pressure warning valves 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.
HINT:
When no transmitter ID is received from a tire pressure warning valve and transmitter for a total of 20 minutes while the vehicle speed is more than 8 km/h (5 mph) or no transmitter ID is received from all the tire pressure warning valves and transmitters for a total of 20 minutes, DTCs are set.
DTCs from C2121/21 to C2124/24 can only be cleared by using the Techstream. 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 No.
DTC Detection Condition
Trouble Area
C2121/21
C2122/22
C2123/23
C2124/24
Following condition (a) or (b) is met:
(a) When all conditions below are met:
  1. Tire pressure warning valve and transmitter is not in stop mode.
  2. Any transmitter ID is not received from tire pressure warning valves and transmitters.
  3. For 20 minutes or more, vehicle speed is more than 8 km/h (5 mph) or no vehicle speed signal or engine speed signal is received.
(b) When all conditions below are met:
  1. Tire pressure warning valve and transmitter is not in stop mode.
  2. No transmitter ID is received from tire pressure warning valves and transmitters 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
NOTICE:
When DTCs C2121/21 to C2124/24 are set, DTC C2173/73 may be set simultaneously. In such cases, troubleshoot C2173/73 first, then troubleshoot DTCs C2121/21 to C2124/24.
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


Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan). Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using a Techstream and write them down before removal.
  2. It is necessary to perform registration (YARIS_NCP93 RM000000XN107JX.html) of the transmitter IDs into the tire pressure warning ECU after the ECU and/or valve and transmitter has been replaced.
1.READ OUTPUT DTC (DTC C2173/73)

  1. Turn the ignition switch off.

  1. Connect a Techstream to the DLC3.

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

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

  1. Read DTCs.

    Result
    Result
    		Proceed to
    DTC C2173/73 is not output
    		A
    DTC C2173/73 is output
    		B
    NOTICE:
    When DTC C2173/73 is output, troubleshoot that DTC first. Then troubleshoot DTCs C2121/21 to C2124/24.


B
GO TO DTC C2173/73 (YARIS_NCP93 RM0000032FT02SX.html)
A


2.CHECK FREQUENCY RECEIVING CONDITION

  1. Check if the vehicle is located in areas 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 turn on only 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 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 pressure to the appropriate specified values (YARIS_NCP93 RM000000XMK06XX.html).

  1. Turn the ignition switch off.

  1. Connect a Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn 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
    ID1 Tire Inflation Pressure
    		ID1 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    ID2 Tire Inflation Pressure
    		ID2 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    ID3 Tire Inflation Pressure
    		ID3 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    ID4 Tire Inflation Pressure
    		ID4 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    HINT:
    *: It may take about 2 or 3 minutes until the values are displayed.

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

  1. Check the Data List.

    NOTICE:
    1. It takes about 2 or 3 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 one by one. Identify the transmitter that corresponds to the DTC.

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


B
Go to step 5

C
END
A


4.CHECK HARNESS AND CONNECTOR (ECU - RECEIVER)


    Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan). Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. Disconnect the D78 ECU connector.

  1. Disconnect the J46 receiver connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D78-12 (RDA) - J46-1 (RDA)
    		Always
    		Below 1 Ω
    D78-11 (GND2) - J46-4 (GND)
    		Always
    		Below 1 Ω
    D78-6 (RF5V) - J46-5 (+5V)
    		Always
    		Below 1 Ω
    D78-12 (RDA) or J46-1 (RDA) - Body ground
    		Always
    		10 kΩ or higher
    D78-11 (GND2) or J46-4 (GND) - Body ground
    		Always
    		10 kΩ or higher
    D78-6 (RF5V) or J46-5 (+5V) - 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 a Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn 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.: FFFFFFF*
    		The ID No. registered in the transmitter ID1 is displayed
    		*: Displayed only when the ID No. is not registered.
    Registered ID2 Code
    		Registered ID2 code/
    min.: 0
    max.: FFFFFFF*
    		The ID No. registered in the transmitter ID2 is displayed
    		*: Displayed only when the ID No. is not registered.
    Registered ID3 Code
    		Registered ID3 code/
    min.: 0
    max.: FFFFFFF*
    		The ID No. registered in the transmitter ID3 is displayed
    		*: Displayed only when the ID No. is not registered.
    Registered ID4 Code
    		Registered ID4 code/
    min.: 0
    max.: FFFFFFF*
    		The ID No. registered in the transmitter ID4 is displayed
    		*: Displayed only when the ID No. is not registered.


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


    Yaris. Ncp93, 131.Tire Pressure Monitoring.Tire Pressure Warning System (For Sedan). Dtc C2121/21 No Signal From Transmitter Id1 In Main Mode

  1. 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 7
A


6.REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER

  1. Replace the tire pressure warning valve and transmitter (YARIS_NCP93 RM000001F7R03BX.html).


NEXT


7.REGISTRATION OF TRANSMITTER ID

  1. Perform registration (YARIS_NCP93 RM000000XN107JX.html).


NEXT


8.CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

  1. Turn the ignition switch off.

  1. Connect a Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn 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
    ID1 Tire Inflation Pressure
    		ID1 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    ID2 Tire Inflation Pressure
    		ID2 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    ID3 Tire Inflation Pressure
    		ID3 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    ID4 Tire Inflation Pressure
    		ID4 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    HINT:
    1. *: It may take about 2 or 3 minutes until the values are displayed.
    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.

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


B
END
A


9.REPLACE TIRE PRESSURE WARNING ANTENNA AND RECEIVER

  1. Replace the tire pressure warning antenna and receiver (YARIS_NCP93 RM0000024T600XX.html).


NEXT


10.CONFIRM TIRE INFLATION PRESSURE (DATA LIST)

  1. Turn the ignition switch off.

  1. Connect a Techstream to the DLC3.

  1. Turn the ignition switch to ON and turn 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
    ID1 Tire Inflation Pressure
    		ID1 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    ID2 Tire Inflation Pressure
    		ID2 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    ID3 Tire Inflation Pressure
    		ID3 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    ID4 Tire Inflation Pressure
    		ID4 tire inflation pressure /
    min.: Absolute pressure / 0 kPa (0 kgf/cm2, 0 psi), Relative pressure / -100 kPa (-1 kgf/cm2, -14 psi)
    max.: Absolute pressure / 637.5 kPa (6.5 kgf/cm2, 92 psi), Relative pressure / 537.5 kPa (5.4 kgf/cm2, 78 psi)
    		Actual tire inflation pressure
    		If 0 kPa (0 kgf/cm2, 0 psi) is displayed for absolute pressure or -100 kPa (-1 kgf/cm2, -14 psi) is displayed for relative pressure, data has not been received.*
    HINT:
    1. *: It may take about 2 or 3 minutes until the values are displayed.
    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.

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


B
REPLACE TIRE PRESSURE WARNING ECU (YARIS_NCP93 RM0000024T801VX.html)
A

END