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TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2179/79

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DTC Code DTC Name
C2179/79 Tire Pressure Monitor ECU Communication Stop
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DESCRIPTION

The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C2179/79 Tire Pressure Monitor ECU Communication Stop Communication between the main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver is interrupted for 10 seconds or more.

  • Main body ECU (Multiplex network body ECU)

  • Wire harness or connector

  • Tire pressure warning ECU and receiver

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the GTS and write them down before removal.

  • It is necessary to perform initialization after registrationClick hereof the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

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PROCEDURE


  1. Click here

    INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (OUTPUT WAVEFORM)


    1. B006Y87C04
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))
      *b GND

      Using an oscilloscope, check the waveform.

      Note:

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

      Standard Voltage
      Tester Connection Tool Setting Range Condition Specified Condition
      K53-11 (PRG) - 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 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

  2. Click here

    CHECK TERMINAL VOLTAGE (TIRE PRESSURE WARNING ECU AND RECEIVER OUTPUT)


    1. Disconnect the K53 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
      K53-11 (PRG) - Body ground Ignition switch ON 9.8 V or higher
      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Turn the ignition switch off.

    2. Disconnect the R9 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
      R9-5 (PRG) - K53-11 (PRG) Always Below 1 Ω
      R9-5 (PRG) or K53-11 (PRG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK HARNESS AND CONNECTOR (POWER SUPPLY - TIRE PRESSURE WARNING ECU AND RECEIVER)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      R9-7 (+B) - Body ground Always 10 to 16 V
      R9-1 (IG) - Body ground Ignition switch ON 10 to 16 V
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE TIRE PRESSURE WARNING ECU AND RECEIVERClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR