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)*1 or certification ECU (smart key ECU assembly)*2 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 (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck on HI output (1 trip detection logic*3).

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

  • ID code box (immobiliser code ECU)*1

  • Certification ECU (smart key ECU assembly)*2

  • 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

A005HA1E03

CAUTION / NOTICE / HINT

Note


  • When replacing the ID code box (immobiliser code ECU) and certification ECU (smart key ECU assembly), refer to the Service Bulletin.

  • The fixed 12 V power source voltage in the ECM is output through a resistance from terminal IMI. The ID code box (immobiliser code ECU) grounds or does not ground this power source voltage accordingly.

  • 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. except 1NZ-FE


      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.

    2. for 1NZ-FE


      1. Turn the engine switch off.

      2. Check that the connectors are properly connected to the ECM and certification ECU (smart key ECU assembly).

        OK
        Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK HARNESS AND CONNECTOR


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

    2. Disconnect the F65 ID certification ECU (smart key ECU assembly) connector.*2

    3. Disconnect the A58*3 or A59*4 ECM connector.

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


      • *1: except 1NZ-FE

      • *2: for 1NZ-FE

      • *3: except 1ND-TV

      • *4: for 1ND-TV

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F65-13 (EFIO) - A58-28 (IMI)*1 Always Below 1 Ω
      F60-4 (EFIO) - A58-28 (IMI)*2 Always Below 1 Ω
      F60-4 (EFIO) - A59-77 (IMI)*3 Always Below 1 Ω

      • *1: for 1NZ-FE

      • *2: for 1NR-FE

      • *3: for 1ND-TV

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F65-13 (EFIO) or A58-28 (IMI) - Body ground*1 Always 10 kΩ or higher
      F60-4 (EFIO) or A58-28 (IMI) - Body ground*2 Always 10 kΩ or higher
      F60-4 (EFIO) or A59-77 (IMI) - Body ground*3 Always 10 kΩ or higher

      • *1: for 1NZ-FE

      • *2: for 1NR-FE

      • *3: for 1ND-TV

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A58-28 (IMI) - Body ground*1 Always Below 1 V
      A59-77 (IMI) - Body ground*2 Always Below 1 V

      • *1: except 1ND-TV

      • *2: for 1ND-TV


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE ID CODE BOX (IMMOBILISER CODE ECU) or CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. except 1NZ-FE


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

    2. for 1NZ-FE


      1. Replace the certification ECU (smart key ECU assembly) with a new one (Refer to Service Bulletin).


    NEXT

  6. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  7. REGISTER RECOGNITION CODES


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


    NEXT

  8. REGISTER ECU COMMUNICATION ID


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


    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 (except 1NZ-FE) A
      DTC B279A is not output (for 1NZ-FE) B
      DTC B279A is output (1NR-FE) C
      DTC B279A is output (1NZ-FE) D
      DTC B279A is output (1ND-TV) E

    A

    END (ID CODE BOX [IMMOBILISER CODE ECU] IS DEFECTIVE)

    B

    END (CERTIFICATION ECU [ISMART KEY ECU ASSEMBLY] IS DEFECTIVE)

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

    REPLACE ECM Click here