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IMMOBILISER SYSTEM(w/o Entry and Start System), Diagnostic DTC:B279A

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DTC Code DTC Name
B279A Theft Deterrent System Communication Line High Fixation
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DESCRIPTION

When the communication line (EFIO-IMI) between the transponder key ECU assembly and ECM is stuck on HI output, the ECM stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B279A Theft Deterrent System Communication Line High Fixation The communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck on HI output (1 trip detection logic*).

  • Harness or connector

  • ECM

  • Transponder key ECU assembly
  • DTC Output Confirmation Operation:

  • Turn the ignition switch to ON and wait 6 seconds.

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine cannot be started (initial ignition occurs and engine cranks, then ignition stops) Engine cannot be started
Table 2. Related Data List and Active Test
DTC No. Data List and Active Test
B279A -
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • If the transponder key ECU assembly or ECM is replaced, refer to Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

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PROCEDURE


  1. Click here

    CLEAR DTC


    1. Clear the DTCs.

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      1. Powertrain > Engine > Clear DTCs


      Result
      Proceed to
      NEXT

  2. Click here

    CHECK FOR DTC


    1. Check for DTCs.

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      1. Powertrain > Engine > Trouble Codes


      Tip:

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

      OK
      DTC B279A is not output.
      Result
      Result Proceed to
      B279A is not output A
      B279A is output B

  3. Click here

    CHECK CONNECTION OF CONNECTOR


    1. Check that the connectors are properly connected to the ECM and transponder key ECU assembly.

      OK
      Connectors are properly connected.
      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM AND BODY GROUND)


    1. Disconnect the G16 transponder key ECU assembly connector.

    2. Disconnect the G45*1, G83*2, G86*3 or G88*4 ECM connector.


      • *1: for 1TR-FE, 2TR-FE

      • *2: for 1KD-FTV, 2KD-FTV

      • *3: for 1GD-FTV, 2GD-FTV

      • *4: for 1GR-FE

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

      Standard Resistance
      Table 3. for 1TR-FE, 2TR-FE
      Tester Connection Condition Specified Condition
      G16-13 (EFIO) - G45-10 (IMI) Always Below 1 Ω
      G45-10 (IMI) - Body ground Always 10 kΩ or higher
      G16-13 (EFIO) - Body ground Always 10 kΩ or higher
      Table 4. for 1KD-FTV, 2KD-FTV
      Tester Connection Condition Specified Condition
      G16-13 (EFIO) - G83-30 (IMI) Always Below 1 Ω
      G83-30 (IMI) - Body ground Always 10 kΩ or higher
      G16-13 (EFIO) - Body ground Always 10 kΩ or higher
      Table 5. for 1GD-FTV, 2GD-FTV
      Tester Connection Condition Specified Condition
      G16-13 (EFIO) - G86-16 (IMI) Always Below 1 Ω
      G86-16 (IMI) - Body ground Always 10 kΩ or higher
      G16-13 (EFIO) - Body ground Always 10 kΩ or higher
      Table 6. for 1GR-FE
      Tester Connection Condition Specified Condition
      G16-13 (EFIO) - G88-10 (IMI) Always Below 1 Ω
      G88-10 (IMI) - Body ground Always 10 kΩ or higher
      G16-13 (EFIO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    REPLACE TRANSPONDER KEY ECU ASSEMBLY


    1. Replace the transponder key ECU assembly with a new one.

      Tip:

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

  6. Click here

    REGISTER KEY


    1. Register the key.

      Tip:

      refer to Service Bulletin.

      Result
      Proceed to
      NEXT

  7. Click here

    REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tip:

      refer to Service Bulletin.

      Result
      Proceed to
      NEXT

  8. Click here

    CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts with the key.

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG (for 1TR-FE)
      NG (for 2TR-FE)
      NG (for 1KD-FTV)
      NG (for 2KD-FTV)
      NG (for 1GD-FTV)
      NG (for 2GD-FTV)
      NG (for 1GR-FE)