IMMOBILISER SYSTEM(w/o Entry and Start 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 high (e.g. shorted to +B), the ECM stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B279A Theft Deterrent System Communication Line High Fixation Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high.

  • Harness or connector

  • ECM

  • Transponder key ECU assembly

  • Telephone transceiver assembly*

    DTC Output Confirmation Operation:

  • 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 stops) Engine cannot be started
Related Data List and Active Test
DTC No. Data List and Active Test
B279A -

WIRING DIAGRAM


  1. 1. w/o Blocking System

    A01V8LXE38

  2. 2. w/ Blocking System

    A01VAFVE03
    *a Telephone Transceiver Assembly
    *b Transponder Key ECU Assembly

CAUTION / NOTICE / HINT

Note


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

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

  • When using the GTS with the vehicle ignition switch off, connect the GTS to the vehicle 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 the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Immobiliser. 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.


  • *: w/ Blocking System

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Engine and ECT > Clear DTCs
      Powertrain > Engine > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Powertrain > Engine and ECT > Trouble Codes
      Powertrain > Engine > Trouble Codes

      Tech Tips

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

      Result
      Proceed to
      B279A is not output
      B279A is output

    B279A is not output

    USE SIMULATION METHOD TO CHECK Click here

    B279A is output

  3. 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

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)


    1. Disconnect the G88 transponder key ECU assembly connector.

    2. Disconnect the A62*1 or A61*2 ECM connector.


      • *1: for Gasoline

      • *2: for Diesel

    3. w/ Blocking System:


      1. Disconnect the G58 telephone transceiver assembly connector.

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

      Standard Resistance
      w/o Blocking System (for Gasoline)
      Tester Connection Condition Specified Condition
      G88-13 (EFIO) - A62-28 (IMI) Always Below 1 Ω
      A62-28 (IMI) - Body ground Always 10 kΩ or higher
      G88-13 (EFIO) - Body ground Always 10 kΩ or higher
      w/o Blocking System (for Diesel)
      Tester Connection Condition Specified Condition
      G88-13 (EFIO) - A61-16 (IMI) Always Below 1 Ω
      A61-16 (IMI) - Body ground Always 10 kΩ or higher
      G88-13 (EFIO) - Body ground Always 10 kΩ or higher
      w/ Blocking System
      Tester Connection Condition Specified Condition
      G88-13 (EFIO) - G58-2 (BLK4) Always Below 1 Ω
      G58-8 (BLK3) - A62-28 (IMI) Always Below 1 Ω
      G88-13 (EFIO) - Body ground Always 10 kΩ or higher
      G58-2 (BLK4) - Body ground Always 10 kΩ or higher
      G58-8 (BLK3) - Body ground Always 10 kΩ or higher
      A62-28 (IMI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE TRANSPONDER KEY ECU ASSEMBLY


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

      Tech Tips

      Refer to the Service Bulletin.

      Note

      Key ID code registration is necessary when replacing the transponder key ECU assembly.

      Refer to the Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  6. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Engine and ECT > Clear DTCs
      Powertrain > Engine > Clear DTCs
      Result
      Proceed to
      NEXT (w/o Blocking System)
      NEXT (w/ Blocking System)

    NEXT (w/ Blocking System)

    CHECK FOR DTC Click here

    NEXT (w/o Blocking System)

  7. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Powertrain > Engine and ECT > Trouble Codes
      Powertrain > Engine > Trouble Codes

      Tech Tips

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

      Result
      Proceed to
      B279A is not output
      B279A is output (for 2AR-FE)
      B279A is output (for 3ZR-FAE)
      B279A is output (for 3ZR-FE)
      B279A is output (for 1AD-FTV)
      B279A is output (for 2AD-FTV)
      B279A is output (for 2AD-FHV)

    B279A is not output

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

    B279A is output (for 2AR-FE)

    REPLACE ECM Click here

    B279A is output (for 3ZR-FAE)

    REPLACE ECM Click here

    B279A is output (for 3ZR-FE)

    REPLACE ECM Click here

    B279A is output (for 1AD-FTV)

    REPLACE ECM Click here

    B279A is output (for 2AD-FTV)

    REPLACE ECM Click here

    B279A is output (for 2AD-FHV)

    REPLACE ECM Click here

  8. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips

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

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

    DTC B279A is not output

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

    DTC B279A is output

  9. REPLACE ECM


    1. Temporarily replace the ECM with a new one.

      for 2AR-FE:

      Click here

      for 3ZR-FE:

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to the Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Powertrain > Engine and ECT > Trouble Codes

      Tech Tips

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

      Result
      Proceed to
      DTC B279A is not output
      DTC B279A is output

    DTC B279A is not output

    END (ECM WAS DEFECTIVE)

    DTC B279A is output

    REPLACE TELEPHONE TRANSCEIVER ASSEMBLY