TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2179

DTC Code DTC Name
C2179 Tire Pressure Monitor ECU Communication Stop

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 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.

  • Wire harness or connector

  • Tire pressure warning ECU and receiver

  • Main body ECU (Multiplex network body ECU)

  • LUG-IG1 NO. 4 fuse

  • ECU-B P NO. 4 fuse*

 -

WIRING DIAGRAM

B004X93E02

CAUTION / NOTICE / HINT

Note


  • When replacing the tire pressure warning ECU and receiver, first use the GTS to record all of the current IDs and registered tires with transmitters (4 or 5 tires) of the tire pressure warning valve and transmitter registered to the tire pressure warning ECU and receiver.

  • It is necessary to perform initialization after registration Click here of 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.

Tech Tips

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


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


    1. B004XBOC03
      *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
      G17-11 (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

    A

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER except RHD and w/ Light Auto Turn-off System (w/ Delay Function): REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here
    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER for RHD and w/ Light Auto Turn-off System (w/ Delay Function): REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    C

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


    1. Disconnect the G17 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
      G17-11 (PRG) - Body ground Power switch on (IG) 9.8 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  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 L48*1 or L110*2 tire pressure warning ECU and receiver connector.


      • *1: except RHD and w/ Light Auto Turn-off System (w/ Delay Function)

      • *2: for RHD and w/ Light Auto Turn-off System (w/ Delay Function)

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

      Standard Resistance
      except RHD and w/ Light Auto Turn-off System (w/ Delay Function):
      Tester Connection Condition Specified Condition
      L48-5 (PRG) - G17-11 (PRG) Always Below 1 Ω
      L48-5 (PRG) or G17-11 (PRG) - Body ground Always 10 kΩ or higher
      Standard Resistance
      for RHD and w/ Light Auto Turn-off System (w/ Delay Function):
      Tester Connection Condition Specified Condition
      L110-5 (PRG2) - G17-11 (PRG) Always Below 1 Ω
      L110-5 (PRG2) or G17-11 (PRG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  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
      except RHD and w/ Light Auto Turn-off System (w/ Delay Function):
      Tester Connection Condition Specified Condition
      L48-7 (+B) - Body ground Always 10 to 16 V
      L48-1 (IG) - Body ground Power switch on (IG) 10 to 16 V
      Standard Voltage
      for RHD and w/ Light Auto Turn-off System (w/ Delay Function):
      Tester Connection Condition Specified Condition
      L110-1 (IG) - Body ground Power switch on (IG) 10 to 16 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER except RHD and w/ Light Auto Turn-off System (w/ Delay Function): REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here
    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER for RHD and w/ Light Auto Turn-off System (w/ Delay Function): REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR