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
B279A The communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high (1 trip detection logic*).

  • ID code box (immobiliser code ECU)

  • ECM

  • Harness or connector

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine cannot be started Engine cannot be started
Related Data List and Active Test
DTC Code Data List and Active Test
B279A -

WIRING DIAGRAM

B001VNCE15

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • Before replacing the ECM or ID code box (immobiliser code ECU), refer to Service Bulletin.

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

Tech Tips

When DTC B279A and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) 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 E124 ID code box (immobiliser code ECU) connector.

    2. Disconnect the A38*1 or A52*2 ECM connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for 3UR-FE, 1GR-FE with Manual Transmission:
      Tester Connection Condition Specified Condition
      E124-4 (EFIO) - A38-46 (IMI) Always Below 1 Ω
      E124-4 (EFIO) or A38-46 (IMI) - Body ground Always 10 kΩ or higher
      for 1UR-FE (for LHD), 1GR-FE with Automatic Transmission:
      Tester Connection Condition Specified Condition
      E124-4 (EFIO) - A38-40 (IMI) Always Below 1 Ω
      E124-4 (EFIO) or A38-40 (IMI) - Body ground Always 10 kΩ or higher
      for 1UR-FE (for RHD):
      Tester Connection Condition Specified Condition
      E124-4 (EFIO) - A52-40 (IMI) Always Below 1 Ω
      E124-4 (EFIO) or A52-40 (IMI) - Body ground Always 10 kΩ or higher
      for 1VD-FTV (for LHD):
      Tester Connection Condition Specified Condition
      E124-4 (EFIO) - A38-11 (IMI) Always Below 1 Ω
      E124-4 (EFIO) or A38-11 (IMI) - Body ground Always 10 kΩ or higher
      for 1VD-FTV (for RHD):
      Tester Connection Condition Specified Condition
      E124-4 (EFIO) - A52-11 (IMI) Always Below 1 Ω
      E124-4 (EFIO) or A52-11 (IMI) - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      for 3UR-FE, 1GR-FE with Manual Transmission:
      Tester Connection Condition Specified Condition
      A38-46 (IMI) - Body ground Always 11 to 14 V
      for 1UR-FE (for LHD), 1GR-FE with Automatic Transmission:
      Tester Connection Condition Specified Condition
      A38-40 (IMI) - Body ground Always 11 to 14 V
      for 1UR-FE (for RHD):
      Tester Connection Condition Specified Condition
      A52-40 (IMI) - Body ground Always 11 to 14 V
      for 1VD-FTV (for LHD):
      Tester Connection Condition Specified Condition
      A38-11 (IMI) - Body ground Always 11 to 14 V
      for 1VD-FTV (for RHD):
      Tester Connection Condition Specified Condition
      A52-11 (IMI) - Body ground Always 11 to 14 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.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  6. REGISTER RECOGNITION CODES


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  7. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  8. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  9. CHECK FOR DTC


    1. Perform "DTC Output Confirmation Operation" procedure.

    2. Check for DTCs Click here.

      OK
      DTC B279A is not output.
      Result Proceed to
      OK A
      NG (for 3UR-FE) B
      NG (for 1UR-FE) C
      NG (for 1GR-FE) D
      NG (for 1VD-FTV) 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