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DTC B1247: Tire Pressure Monitor Receiver Communication Stop [03/2017 - 08/2022]: Procedure

  1. CHECK VEHICLE 
    1. Check the production time of the vehicle.

      Result

      Result Proceed to
      Before Sep. 2021 Production A
      From Sep. 2021 Production B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. INSPECT TIRE PRESSURE WARNING ECU AND RECEIVER (OUTPUT WAVEFORM) 
    1. Using an oscilloscope, check the waveform.
      NOTE:

      With the connector connected, check from the backside of the connector.

      GTY890533Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/ Smart Key System
      *B w/o Smart Key System
      *a Component with harness connected
      (Tire Pressure Warning ECU and Receiver)
      *b GND

      OK

      W/ SMART KEY SYSTEM

      Tester Connection Tool Setting Range Condition Specified Condition
      R9-4 (RDA) - Body ground 5 V/DIV.5 ms./DIV. Ignition switch ON Waveform generation
      W/O SMART KEY SYSTEM

      Tester Connection Tool Setting Range Condition Specified Condition
      R120-4 (RDA) - Body ground 5 V/DIV.5 ms./DIV. Ignition switch ON Waveform generation

      Result

      Result Proceed to
      Waveform is as shown in the illustration. (Waveform alternates between 10.5 V or higher and 0.5 V or less) A
      Waveform does not change from 10.5 V or higher B
      Waveform does not change from 0.5 V or less C

    Result: 

    A 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

    Result: 

    B 

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 09/2019]  , or refer to  REMOVAL [09/2019 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

    Result: 

    C 

    See step  3

  3. CHECK TERMINAL VOLTAGE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) OUTPUT) 
    1. Disconnect the R9 or R120 tire pressure warning ECU and receiver connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      W/ SMART KEY SYSTEM

      Tester Connection Condition Specified Condition
      R9-4 (RDA) - Body ground Ignition switch ON 10.5 V or higher
      W/O SMART KEY SYSTEM

      Tester Connection Condition Specified Condition
      R120-4 (RDA) - Body ground Ignition switch ON 10.5 V or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 09/2019]  , or refer to  REMOVAL [09/2019 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - TIRE PRESSURE WARNING ECU AND RECEIVER) 
    1. Turn the ignition switch off.
    2. Disconnect the K53 main body ECU (multiplex network body ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ SMART KEY SYSTEM

      Tester Connection Condition Specified Condition
      K53-10 (RDA) - R9-4 (RDA) Always Below 1 Ω
      K53-10 (RDA) or R9-4 (RDA) - Body ground Always 10 kΩ or higher
      W/O SMART KEY SYSTEM

      Tester Connection Condition Specified Condition
      K53-10 (RDA) - R120-4 (RDA) Always Below 1 Ω
      K53-10 (RDA) or R120-4 (RDA) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. INSPECT TIRE PRESSURE WARNING ECU AND RECEIVER (OUTPUT WAVEFORM) 
    1. Using an oscilloscope, check the waveform.
      NOTE:

      With the connector connected, check from the backside of the connector.

      GTY1092435Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/ Smart Key System
      *B w/o Smart Key System
      *a Component with harness connected
      (Tire Pressure Warning ECU and Receiver)
      *b GND

      OK

      W/ SMART KEY SYSTEM

      Tester Connection Tool Setting Range Condition Specified Condition
      R127-4 (RDA) - Body ground 5 V/DIV.5 ms./DIV. Ignition switch ON Waveform generation
      W/O SMART KEY SYSTEM

      Tester Connection Tool Setting Range Condition Specified Condition
      R120-4 (RDA) - Body ground 5 V/DIV.5 ms./DIV. Ignition switch ON Waveform generation

      Result

      Result Proceed to
      Waveform is as shown in the illustration. (Waveform alternates between 10.5 V or higher and 0.5 V or less) A
      Waveform does not change from 10.5 V or higher B
      Waveform does not change from 0.5 V or less C

    Result: 

    A 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

    Result: 

    B 

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 09/2019]  , or refer to  REMOVAL [09/2019 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

    Result: 

    C 

    See step  6

  6. CHECK TERMINAL VOLTAGE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) OUTPUT) 
    1. Disconnect the R127 or R120 tire pressure warning ECU and receiver connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      W/ SMART KEY SYSTEM

      Tester Connection Condition Specified Condition
      R127-4 (RDA) - Body ground Ignition switch ON 10.5 V or higher
      W/O SMART KEY SYSTEM

      Tester Connection Condition Specified Condition
      R120-4 (RDA) - Body ground Ignition switch ON 10.5 V or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 09/2019]  , or refer to  REMOVAL [09/2019 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - TIRE PRESSURE WARNING ECU AND RECEIVER) 
    1. Turn the ignition switch off.
    2. Disconnect the K53 main body ECU (multiplex network body ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/ SMART KEY SYSTEM

      Tester Connection Condition Specified Condition
      K53-10 (RDA) - R127-4 (RDA) Always Below 1 Ω
      K53-10 (RDA) or R127-4 (RDA) - Body ground Always 10 kΩ or higher
      W/O SMART KEY SYSTEM

      Tester Connection Condition Specified Condition
      K53-10 (RDA) - R120-4 (RDA) Always Below 1 Ω
      K53-10 (RDA) or R120-4 (RDA) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [03/2017 - 06/2017]  , or refer to  REMOVAL [06/2017 - 10/2020]  , or refer to  REMOVAL [10/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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