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Home >> Lexus >> 2007 >> ES 350 >> Repair and Diagnosis (Single Page) >> Suspension >> Wheels & Tire System >> Tire & Wheel >> Tire Pressure Warning System >> 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 C2125/25 No Signal from Transmitter ID5 in Main Mode; DTC C2131/31 No Signal from Transmitter ID1 in 2nd Mode; DTC C2132/32 No Signal from Transmitter ID2 in 2nd Mode; DTC C2133/33 No Signal from Transmitter ID3 in 2nd Mode; DTC C2134/34 No Signal from Transmitter ID4 in 2nd Mode; DTC C2135/35 No Signal from Transmitter ID5 in 2nd 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); DTC C2185/85 Transmitter ID5 not Received (Test Mode DTC) >> Inspection Procedure

Inspection Procedure

NOTE:
  • When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the intelligent tester and write them down before removal.
  • It is necessary to perform initialization (See INITIALIZATION  ) after registration (See REGISTRATION  ) of the transmitter IDs into the tire pressure warning ECU after the ECU and/or valve and transmitter has been replaced.
  1. CHECK FREQUENCY RECEIVING CONDITION 
    1. Check if the vehicle is not located in areas such as 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 come 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: Go to next step. 

  2. IDENTIFY TRANSMITTER CORRESPONDING TO DTC 
    1. Set the tire pressure to the appropriate specified values.

      Cold tire inflation pressure 

      COLD TIRE INFLATION PRESSURE REFERENCE CHART

      Tire size Front kPa (kgf/cm2 , psi) Rear kPa (kgf/cm2 , psi)
      P215/55R17 93V 210 (2.1, 30) 210 (2.1, 30)
    2. Select "TIREPRESS" by following the prompts displayed on the intelligent tester.

      TIRE PRESSURE: 

      NORMAL CONDITION CHART

      Tester Display Measurement Item/Range Normal Condition
      TIREPRESS1 ID1 tire inflation pressure/min.: 0 kPa (0 kgf/cm2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
      TIREPRESS2 ID2 tire inflation pressure/min.: 0 kPa (0 kgf/cm2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
      TIREPRESS3 ID3 tire inflation pressure/min.: 0 kPa (0 kgf/cm2 , 0 psi). max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
      TIREPRESS4 ID4 tire inflation pressure/min.: 0 kPa (0 kgf/cm2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
      TIREPRESS5 ID5 tire inflation pressure/ min.: 0 kPa (0 kgf/cm2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
    3. Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.41 kg/cm2 , 5.8 psi) within 30 seconds.
    4. Check the DATA LIST.
      NOTE:
      • It takes about 1 minute or more to display the updated tire pressure data.
      • When no "TIREPRESS" data has 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 it.
      • Record the transmitter ID of which "TIREPRESS" data corresponds to each tire.
    5. After confirming that one of "TIREPRESS" data for one tire (ID1 to ID4 or ID5) has changed, repeat this procedure one by one. Identify the transmitter that corresponds to DTC.

      Result 

      RESULT CHART

      Condition Proceed to
      All tire pressure readings are equal to specified values A
      Any of tire pressure values are not displayed B
      All tire pressure values are not displayed C

    A: END 

    B: Go to step  6

    C: Go to next step. 

  3. SWITCH TIRE PRESSURE WARNING SELECT SWITCH 
    1. Switch tire pressure warning select switch to the other position (MAIN to 2nd or 2nd to MAIN).
    2. Set the tire pressure to the appropriate specified values.

      Cold tire inflation pressure 

      COLD TIRE INFLATION PRESSURE REFERENCE CHART

      Tire size Front kPa (kgf/cm2 , psi) Rear kPa (kgf/cm2 , psi)
      P215/55R17 93V 210 (2.1, 30) 210 (2.1, 30)
    3. Select "TIREPRESS" by following the prompts displayed on the intelligent tester.

      TIRE PRESSURE: 

      NORMAL CONDITION CHART

      Tester Display Measurement Item/Range Normal Condition
      TIREPRESS1 ID1 tire inflation pressure/min.: 0 kPa (0 kgf/cm2 ,0 psi), max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
      TIREPRESS2 ID2 tire inflation pressure/min.: 0 kPa (0 kgf/cm2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
      TIREPRESS3 ID3 tire inflation pressure/min.: 0 kPa (0 kgf/cm2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
      TIREPRESS4 ID4 tire inflation pressure/min.: 0 kPa (0 kgf/cm2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
      TIREPRESS5 ID5 tire inflation pressure/min.: 0 kPa (0 kgf/cm2 , 0 psi), max.: 637.5 kPa (6.48 kgf/cm2 , 92.2 psi) Actual tire inflation pressure
    4. Rapidly reduce the tire pressure for each wheel at least 40 kPa (0.41 kg/cm2 , 5.8 psi) within 30 seconds.
    5. Check the DATA LIST.
      NOTE:
      • It takes about 1 minute or more to display the updated tire pressure data.
      • When no "TIREPRESS" data has 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 it.
      • Record the transmitter ID of which "TIREPRESS" data corresponds to each tire.
    6. After confirming that one of "TIREPRESS" data for one tire (ID1 to ID4 or ID5) has changed, repeat this procedure one by one. Identify the transmitter that corresponds to DTC.

      Result 

      RESULT CHART

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

    A: END 

    B: Go to next step. 

  4. RETURN TIRE PRESSURE WARNING SELECT SWITCH TO ORIGINAL POSITION 
  5. CHECK HARNESS AND CONNECTOR (ECU - RECEIVER) 
    1. Disconnect the E81 ECU connector.
    2. Disconnect the M33 receiver connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

      Tester Connection Specified Condition
      E81-12 (RDA) - M33-1 (RDA) Below 1 Ω
      E81-11 (GND2) - M33-4 (GND)
      E81-6 (RF5V) - M33-5 (+5V)
      E81-12 (RDA) - Body ground 10 kΩ or higher
      E81-11 (GND2) - Body ground
      E81-6 (RF5V) - Body ground
    Fig 1: Identifying E81 ECU And M33 Connector Terminals
    G05250286Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  6. INSPECT TIRE PRESSURE WARNING ANTENNA AND RECEIVER 
    1. Select REGIT ID CODE by following the prompts displayed on the intelligent tester.

      TIRE PRESSURE: 

      NORMAL CONDITION CHART

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      REGIT ID1 CODE Registered ID1 code/min.: 0, max.: FFFFFF* The ID No. registered in the transmitter ID1 is displayed *: Displayed only when the ID No. is not registered.
      REGIT ID2 CODE Registered ID2 code/min.: 0, max.: FFFFFF* The ID No. registered in the transmitter ID2 is displayed *: Displayed only when the ID No. is not registered.
      REGIT ID3 CODE Registered ID3 code/min.: 0, max.: FFFFFF* The ID No. registered in the transmitter ID3 is displayed *: Displayed only when the ID No. is not registered.
      REGIT ID4 CODE Registered ID4 code/min.: 0, max.: FFFFFF* The ID No. registered in the transmitter ID4 is displayed *: Displayed only when the ID No. is not registered.
      REGIT ID5 CODE Registered ID5 code/min.: 0, max.: FFFFFF* The ID No. registered in the transmitter ID5 is displayed *: Displayed only when the ID No. is not registered.
    2. Check the ID number on the identified transmitter by removing it from the tire and wheel.
      Fig 2: Identifying Tire Pressure Warning Valve And Transmitter
      G04977845Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Confirm that the ID number on the transmitter and recorded transmitter ID match.

      Result 

      RESULT CHART

      Result Proceed to
      Match A
      Do not match B

    B: Go to step  8

    A: Go to next step. 

  7. REPLACE TIRE PRESSURE WARNING VALVE AND TRANSMITTER 

    HINT:

    (See REMOVAL  )

  8. REGISTRATION OF TRANSMITTER ID 
    1. Perform registration (See REGISTRATION  ).
    2. Set the tire air pressure appropriate specified values.

      Cold tire inflation pressure 

      COLD TIRE INFLATION PRESSURE REFERENCE CHART

      Tire size Front kPa (kgf/cm2 , psi) Rear kPa (kgf/cm2 , psi)
      P215/55R17 93V 210 (2.1, 30) 210 (2.1, 30)
  9. PERFORM INITIALIZATION 
    1. Perform initialization (See INITIALIZATION  ).
  10. READ VALUE OF DATA LIST 
    1. Turn the engine switch off, and then turn it on (IG).
    2. Select "TIREPRESS" by following the prompts displayed on the intelligent tester.

      HINT:

      It may take up to 1 minute or more to display the tire pressure data.

      Result 

      RESULT CHART

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

    A: END 

    B: Go to next step. 

  11. REPLACE TIRE PRESSURE WARNING ANTENNA AND RECEIVER 
    1. Replace the tire pressure warning antenna and receiver (See REMOVAL  ).
  12. READ VALUE OF DATA LIST 
    1. Turn the engine switch off, and then turn it on (IG).
    2. Select "TIREPRESS" by following the prompts displayed on the intelligent tester.

      HINT:

      It may take up to 1 minute or more to display the tire pressure data.

      Result 

      RESULT CHART

      Condition 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 (See  REMOVAL   ) 

    A: END 

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