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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. DTC Detection Condition Trouble Area
C2179/79 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 IDs stored in the old ECU using the GTS and write them down before removal.

  • It is necessary to perform initialization (See page ) after registration (Click here) of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.

  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

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PROCEDURE


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


    1. Turn the engine switch off.

    2. Disconnect the L65*1 or L75*2 tire pressure warning ECU and receiver connector.


      • *1: w/o Front Antenna

      • *2: w/ Front Antenna

    3. Disconnect the E118 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      L65-5 (PRG) - E118-5 (PRG)*1

      L75-5 (PRG2) - E118-5 (PRG)*2

      		 Always Below 1 Ω

      L65-5 (PRG) or E118-5 (PRG) - Body ground*1

      L75-5 (PRG2) or E118-5 (PRG) - Body ground*2

      		 Always 10 kΩ or higher

      • *1: w/o Front Antenna

      • *2: w/ Front Antenna


    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER


    1. Replace the tire pressure warning ECU and receiver (Click here).


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    CHECK DTC OUTPUT


    1. Clear the DTCs (Click here).

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Check for DTCs (Click here).

      Result
      Result Proceed to
      DTC C2179/79 is not output. A
      DTC C2179/79 is output. for LHD B
      for RHD C

    • A

      END

    • B

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

    • C

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