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

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

C257851E48

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 (Click here) after registration (Click here) of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

PROCEDURE

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

    1. Disconnect the tire pressure warning ECU and receiver M11*1, *3 or M30*2 connector and main body ECU (multiplex network body ECU) G78 connector.

      • *1: for Air Bag Caution Label with "9L" Identification Mark

      • *2: except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type

      • *3: except Air Bag Caution Label with "9L" Identification Mark for FMVSS138 Type

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

      Standard Resistance

      Table 1. for Air Bag Caution Label with "9L" Identification Mark, except Air Bag Caution Label with "9L" Identification Mark for FMVSS138 Type

      Tester Connection

      Condition

      Specified Condition

      M11-5 (PRG) - G78-4 (PRG)

      Always

      Below 1 Ω

      M11-5 (PRG) or G78-4 (PRG) - Body ground

      Always

      10 kΩ or higher
      Table 2. except Air Bag Caution Label with "9L" Identification Mark for ECE-R64 Type

      Tester Connection

      Condition

      Specified Condition

      M30-5 (PRG2) - G78-4 (PRG)

      Always

      Below 1 Ω

      M30-5 (PRG2) or G78-4 (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.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  3. REGISTRATION OF TRANSMITTER ID

    1. Register the transmitter ID for all wheels.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  4. PERFORM INITIALIZATION

    1. Perform initialization.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  5. 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