ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B279A

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

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B279A 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

  • Transponder key ECU assembly

  • ECM

 Turn the ignition switch to ON and wait 6 seconds.

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 stop). Engine cannot be started.
Related Data List and Active Test
DTC Code Data List and Active Test
B279A -

WIRING DIAGRAM

A01DVW6E01

INSPECTION PROCEDURE

Note


  • When replacing the transponder key ECU assembly or ECM, refer to the Service Bulletin.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

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

Tech Tips

After troubleshooting for this DTC, make sure B279A is not present. If present, troubleshoot the blocking system DTCs next.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      No DTC is output A
      DTC B279A and other DTCs are output B
      DTC B279A is output C

      Tech Tips

      If any DTCs other than B279A are output, troubleshoot those DTCs first.


    B

    Go to DIAGNOSTIC TROUBLE CODE CHART Click here

    C

    CHECK HARNESS AND CONNECTOR (SFI OR ECD COMMUNICATION LINE) Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK HARNESS AND CONNECTOR (SFI OR ECD COMMUNICATION LINE)


    1. Disconnect the T21 transponder key ECU assembly connector.

    2. Disconnect the E6*1, E13*2, E30*3 or E10*4 ECM connector.


      • *1: for 1KD-FTV, 2KD-FTV (except DPF)

      • *2: for 1GR-FE

      • *3: for 1KD-FTV, 2KD-FTV (for DPF)

      • *4: for 2TR-FE

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

      Standard Resistance
      for 1KD-FTV, 2KD-FTV (except DPF)
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) - E6-30 (IMI) Always Below 1 Ω
      T21-13 (EFIO) or E6-30 (IMI) - Body ground Always 10 kΩ or higher
      for 1GR-FE
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) - E13-16 (IMI) Always Below 1 Ω
      T21-13 (EFIO) or E13-16 (IMI) - Body ground Always 10 kΩ or higher
      for 1KD-FTV, 2KD-FTV (for DPF)
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) - E30-28 (IMI) Always Below 1 Ω
      T21-13 (EFIO) or E30-28 (IMI) - Body ground Always 10 kΩ or higher
      for 2TR-FE
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) - E10-16 (IMI) Always Below 1 Ω
      T21-13 (EFIO) or E10-16 (IMI) - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      for 1KD-FTV, 2KD-FTV (except DPF)
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) or E6-30 (IMI) - Body ground Always Below 1 V
      for 1GR-FE
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) or E13-16 (IMI) - Body ground Always Below 1 V
      for 1KD-FTV, 2KD-FTV (for DPF)
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) or E30-28 (IMI) - Body ground Always Below 1 V
      for 2TR-FE
      Tester Connection Condition Specified Condition
      T21-13 (EFIO) or E10-16 (IMI) - Body ground Always Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK TRANSPONDER KEY ECU ASSEMBLY (TERMINAL EFIO)


    1. A01E267E02
      Text in Illustration
      *1 Waveform
      *a

      Component with harness connected

      (Transponder Key ECU Assembly)

      Using an oscilloscope, check the waveform.

      Measurement Condition
      Item Content
      Tester Connection T21-13 (EFIO) - T21-16 (GND)
      Tool Setting 10V/DIV., 100 ms./DIV.
      Condition Ignition switch ON

      Tech Tips

      The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      OK
      Waveform is output normally (refer to illustration).

    NG

    CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND) Click here

    OK

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

  5. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND)


    1. A01DWN9E04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Transponder Key ECU Assembly)

      Disconnect the T21 transponder key ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T21-16 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      T21-1 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE ECM


    1. Temporarily replace the ECM with a new one.



    NEXT

  7. REGISTER ECU COMMUNICATION ID


    1. Register the ECU - ECM communication ID (Refer to the Service Bulletin).


    NEXT

  8. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  9. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B279A is not output.

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    OK

    END (ECM IS DEFECTIVE)