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

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

DESCRIPTION

When the communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high, the ECM stores this DTC.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B279A The communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck on HI output (1 trip detection logic*1).

  • Wire harness or connector (disconnection or break in wire harness is main cause)

  • ID code box (immobiliser code ECU)

  • ECM

 Turn the engine switch on (IG) 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 stops) Engine cannot be started
Related Data List and Active Test
DTC Code Data List and Active Test
B279A -

WIRING DIAGRAM

A01VHB0E01

CAUTION / NOTICE / HINT

Note


  • When replacing the ID code box (immobiliser code ECU), refer to the entry and start system (for Entry Function) Click here.

  • When replacing the ECM, refer to the INITIALIZATION Click here.

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

Tech Tips

When DTC B279A and the certification ECU DTC are output simultaneously, first perform troubleshooting for the certification ECU DTC.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Turn the engine switch on (IG) and wait 10 seconds.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B279A is output A
      DTC B279A and other DTCs are output B

      Tech Tips

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


    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. CHECK CONNECTION OF CONNECTOR


    1. Turn the engine switch off.

    2. Check that the connectors are properly connected to the ECM and ID code box (immobiliser code ECU).

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)


    1. Disconnect the F60 ID code box (immobiliser code ECU) connector.

    2. Disconnect the A93*1, A58*2, A59*3 or A108*4 ECM connector.


      • *1: for 1KR-FE

      • *2: for 1NR-FE

      • *3: for 1ND-TV without DPF

      • *4: for 1ND-TV with DPF

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

      Standard Resistance
      for 1KR-FE
      Tester Connection Condition Specified Condition
      F60-4 (EFIO) - A93-42 (IMI) Always Below 1 Ω
      F60-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 1NR-FE
      Tester Connection Condition Specified Condition
      F60-4 (EFIO) - A58-28 (IMI) Always Below 1 Ω
      F60-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 1ND-TV without DPF
      Tester Connection Condition Specified Condition
      F60-4 (EFIO) - A59-77 (IMI) Always Below 1 Ω
      F60-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 1ND-TV with DPF
      Tester Connection Condition Specified Condition
      F60-4 (EFIO) - A108-34 (IMI) Always Below 1 Ω
      F60-4 (EFIO) - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      for 1KR-FE
      Tester Connection Condition Specified Condition
      A93-42 (IMI) - Body ground Always Below 1 V
      for 1NR-FE
      Tester Connection Condition Specified Condition
      A58-28 (IMI) - Body ground Always Below 1 V
      for 1ND-TV without DPF
      Tester Connection Condition Specified Condition
      A59-77 (IMI) - Body ground Always Below 1 V
      for 1ND-TV with DPF
      Tester Connection Condition Specified Condition
      A108-34 (IMI) - Body ground Always Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Replace the ID code box (immobiliser code ECU) with a new one (Refer to Service Bulletin).


    NEXT

  6. REGISTER RECOGNITION CODES


    1. Register the recognition codes in the ECUs (Refer to Service Bulletin).


    NEXT

  7. REGISTER ECU COMMUNICATION ID


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


    NEXT

  8. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  9. CHECK FOR DTC


    1. Check for DTCs Click here.

      Tech Tips

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

      Result
      Result Proceed to
      DTC B279A is not output A
      DTC B279A is output (for 1KR-FE) B
      DTC B279A is output (for 1NR-FE) C
      DTC B279A is output (for 1ND-TV with DPF) D
      DTC B279A is output (for 1ND-TV without DPF) E

    A

    END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

    REPLACE ECM Click here