TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2179/79

DTC Code DTC Name
C2179/79 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

C2179/79

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

-

WIRING DIAGRAM

C257851E11

CAUTION / NOTICE / HINT

Note:

  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the GTS and write them down before removal.

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

PROCEDURE

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

    1. Disconnect the L70, L88 or Q15 tire pressure warning ECU and receiver connector.

    2. Disconnect the E22 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance

      Table 1. for Sedan:

      Tester Connection

      Condition

      Specified Condition

      L70-5 (PRG2) - E22-4 (PRG)

      Always

      Below 1 Ω

      L70-5 (PRG2) or E22-4 (PRG) - Body ground

      Always

      10 kΩ or higher
      Table 2. for Hatchback:

      Tester Connection

      Condition

      Specified Condition

      L88-5 (PRG2) - E22-4 (PRG)

      Always

      Below 1 Ω

      L88-5 (PRG2) or E22-4 (PRG) - Body ground

      Always

      10 kΩ or higher
      Table 3. for Wagon:

      Tester Connection

      Condition

      Specified Condition

      Q15-5 (PRG2) - E22-4 (PRG)

      Always

      Below 1 Ω

      Q15-5 (PRG2) or E22-4 (PRG) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

    1. Replace the tire pressure warning ECU and receiver.

      for Sedan:Click here

      for Wagon:Click here

      for Hatchback:Click here

    Result

    Proceed to

    NEXT
    NEXT

  3. CHECK DTC OUTPUT

    1. Clear the DTCs.

      Click here

      Chassis > Tire Pressure Monitor > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON.

    4. Check for DTCs.

      Click here

      Chassis > Tire Pressure Monitor > Trouble Codes

      OK

      DTC C2179/79 is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD

    Click here

    for RHD

    Click here