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 certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU)* is stuck high, the ECM stores this DTC.


DTC No. Detection Item DTC Detection Condition Trouble Area Note
B279A Theft Deterrent System Communication Line High Fixation The communication line (IMI - EFIO) between the ECM and certification ECU (smart key ECU assembly) ID code box (immobiliser code ECU)*2 is stuck high (1 trip detection logic*1).

  • Harness or connector

  • Certification ECU (smart key ECU assembly)

  • ID code box (immobiliser code ECU)*2

  • ECM

DTC output confirmation operation:


  • 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 No. Data List and Active Test
B279A -

WIRING DIAGRAM

Figure 1. w/o Seat Heater System

B0025TAE01

Figure 2. w/ Seat Heater System

A01SHMWE01
*a ID Code Box (Immobiliser Code ECU)

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 certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU)* or ECM, refer to Service Bulletin.

    *: w/ Seat Heater System

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

Tech Tips

When DTC B279A and a 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


      Powertrain > Engine > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


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

    2. Check for DTCs.

      Click here


      Powertrain > Engine > Trouble Codes

      Tech Tips

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

      Result
      Result Proceed to
      DTC B279A is not output (w/ Seat Heater System) A
      DTC B279A is not output (w/o Seat Heater System) B
      DTC B279A and other DTCs are output C

    B

    CHECK CONNECTION OF CONNECTOR Click here

    C

    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.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

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


    1. Disconnect the G82 ID code box (immobiliser code ECU) connector.

    2. Disconnect the G86 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G82-4 (EFIO) - G86-16 (IMI) Always Below 1 Ω
      G86-16 (IMI) - Body ground Always 10 kΩ or higher
      G82-4 (EFIO) - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G86-16 (IMI) - Body ground Always Below 1 V
      Result
      Proceed to
      OK
      NG

    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.

      Note

      Recognition code registration is necessary when replacing the ID code box (immobiliser code ECU).

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  6. REGISTER RECOGNITION CODES


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  7. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  8. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Engine > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Powertrain > Engine > Trouble Codes

      Tech Tips

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

      OK
      DTC B279A is not output.
      Result
      Proceed to
      OK
      NG (for 1GD-FTV)
      NG (for 2GD-FTV)

    OK

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

    NG (for 1GD-FTV)

    REPLACE ECM Click here

    NG (for 2GD-FTV)

    REPLACE ECM Click here

  10. CHECK CONNECTION OF CONNECTOR


    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.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  11. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM)


    1. Disconnect the G70 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the G45*1, G83*2, G86*3 or G88*4 ECM connector.


      • *1: for 2TR-FE

      • *2: for 1KD-FTV, 2KD-FTV

      • *3: for 1GD-FTV, 2GD-FTV

      • *4: for 1GR-FE

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

      Standard Resistance
      for 2TR-FE
      Tester Connection Condition Specified Condition
      G70-35 (EFIO) - G45-10 (IMI) Always Below 1 Ω
      G45-10 (IMI) - Body ground Always 10 kΩ or higher
      G70-35 (EFIO) - Body ground Always 10 kΩ or higher
      for 1KD-FTV, 2KD-FTV
      Tester Connection Condition Specified Condition
      G70-35 (EFIO) - G83-30 (IMI) Always Below 1 Ω
      G83-30 (IMI) - Body ground Always 10 kΩ or higher
      G70-35 (EFIO) - Body ground Always 10 kΩ or higher
      for 1GD-FTV, 2GD-FTV
      Tester Connection Condition Specified Condition
      G70-35 (EFIO) - G86-16 (IMI) Always Below 1 Ω
      G86-16 (IMI) - Body ground Always 10 kΩ or higher
      G70-35 (EFIO) - Body ground Always 10 kΩ or higher
      for 1GR-FE
      Tester Connection Condition Specified Condition
      G70-35 (EFIO) - G88-10 (IMI) Always Below 1 Ω
      G88-10 (IMI) - Body ground Always 10 kΩ or higher
      G70-35 (EFIO) - Body ground Always 10 kΩ or higher

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

      Standard Voltage
      for 2TR-FE
      Tester Connection Condition Specified Condition
      G45-10 (IMI) - Body ground Always Below 1 V
      for 1KD-FTV, 2KD-FTV
      Tester Connection Condition Specified Condition
      G83-30 (IMI) - Body ground Always Below 1 V
      for 1GD-FTV, 2GD-FTV
      Tester Connection Condition Specified Condition
      G86-16 (IMI) - Body ground Always Below 1 V
      for 1GR-FE
      Tester Connection Condition Specified Condition
      G88-10 (IMI) - Body ground Always Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Replace the certification ECU (smart key ECU assembly) with a new one.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  13. REGISTER RECOGNITION CODES


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  14. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  15. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Engine > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  16. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Powertrain > Engine > Trouble Codes

      Tech Tips

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

      OK
      DTC B279A is not output.
      Result
      Proceed to
      OK
      NG (for 2TR-FE)
      NG (for 1KD-FTV)
      NG (for 2KD-FTV)
      NG (for 1GD-FTV)
      NG (for 2GD-FTV)
      NG (for 1GR-FE)

    OK

    END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)

    NG (for 2TR-FE)

    REPLACE ECM Click here

    NG (for 1KD-FTV)

    REPLACE ECM Click here

    NG (for 2KD-FTV)

    REPLACE ECM Click here

    NG (for 1GD-FTV)

    REPLACE ECM Click here

    NG (for 2GD-FTV)

    REPLACE ECM Click here

    NG (for 1GR-FE)

    REPLACE ECM Click here