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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 267 (Tire Pressure Warning System (Hybrid) - Diagnostic Codes & Symptom Tests) >> TIRE PRESSURE WARNING SYSTEM (for HV Model) >> DTC C2179: Tire Pressure Monitor ECU Communication Stop [06/2018 - ] >> Procedure

DTC C2179: Tire Pressure Monitor ECU Communication Stop [06/2018 - ]: Procedure

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  1. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (OUTPUT WAVEFORM) 
    1. Using an oscilloscope, check the waveform.
      NOTE:

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

      GTY819985Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Main Body ECU (Multiplex Network Body ECU))
      *b GND

      OK

      Tester Connection Tool Setting Range Condition Specified Condition
      G38-11 (PRG) - Body ground 5 V/DIV.5 ms./DIV. Power switch on (IG) Waveform generation

      Result

      Result Proceed to
      Waveform is as shown in the illustration. (Waveform alternates between 9.8 V or higher and 1.2 V or less) A
      Waveform does not change from 9.8 V or higher B
      Waveform does not change from 1.2 V or less C

    Result: 

    A 

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    C 

    See step  2

  2. CHECK TERMINAL VOLTAGE (TIRE PRESSURE WARNING ECU AND RECEIVER OUTPUT) 
    1. Disconnect the G38 main body ECU (multiplex network body ECU) connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G38-11 (PRG) - Body ground Power switch on (IG) 9.8 V or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Turn the power switch off.
    2. Disconnect the N8 tire pressure warning ECU and receiver connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N8-5 (PRG) - G38-11 (PRG) Always Below 1 Ω
      N8-5 (PRG) or G38-11 (PRG) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (POWER SUPPLY - TIRE PRESSURE WARNING ECU AND RECEIVER) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      N8-7 (+B) - Body ground Always 10 to 16 V
      N8-1 (IG) - Body ground Power switch on (IG) 10 to 16 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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