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

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

DESCRIPTION


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 ID code box (immobiliser code ECU)*1 or certification ECU (smart key ECU assembly)*2 is stuck high (1 trip detection logic*3).

  • Harness or connector

  • ID code box (immobiliser code ECU)*1

  • Certification ECU (smart key ECU assembly)*2

  • ECM

DTC output confirmation operation:


  • Turn the engine switch on (IG) and wait 10 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

A01QTGIE05

CAUTION / NOTICE / HINT

Note


  • When replacing the certification ECU (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2, refer to the Service Bulletin.

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


  • *1: w/ ID code box (Immobiliser Code ECU)

  • *2: w/o ID code box (Immobiliser Code ECU)

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


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

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


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

      Tech Tips

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

      Result
      Proceed to
      DTC B279A is not output
      DTC B279A and other DTCs are output

    DTC B279A and other DTCs are output

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    DTC B279A is not output

  3. CHECK CONNECTION OF CONNECTOR


    1. Turn the engine switch off.

    2. Check that the connectors are properly connected to the ECM, ID code box (immobiliser code ECU)*1 and certification ECU (smart key ECU assembly)*2.


      • *1: w/ ID code box (Immobiliser Code ECU)

      • *2: w/o 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] OR CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - ECM)


    • *1: w/ ID code box (Immobiliser Code ECU)

    • *2: w/o ID code box (Immobiliser Code ECU)

    • *3: for 3ZR-FE, 3ZR-FAE, 2AR-FE

    • *4: for 2WW

    • *5: 2AD-FHV, 2AD-FTV


    1. Disconnect the G44 ID code box (immobiliser code ECU) connector.*1

    2. Disconnect the G82 certification ECU (smart key ECU assembly) connector.*2

    3. Disconnect the A62*3, *4, *5 or A61*6 ECM connector.

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

      Standard Resistance
      for 3ZR-FE, 3ZR-FAE, 2AR-FE
      Tester Connection Condition Specified Condition
      G44-4 (EFIO) - A62-28 (IMI)*1 Always Below 1 Ω
      G82-13 (EFIO) - A62-28 (IMI)*2
      A62-28 (IMI) - Body ground Always 10 kΩ or higher
      G44-4 (EFIO) - Body ground*1 Always 10 kΩ or higher
      G82-13 (EFIO) - Body ground*2 Always 10 kΩ or higher
      for 2WW
      Tester Connection Condition Specified Condition
      G44-4 (EFIO) - A62-34 (IMI)*1 Always Below 1 Ω
      A62-34 (IMI) - Body ground Always 10 kΩ or higher
      G44-4 (EFIO) - Body ground*1 Always 10 kΩ or higher
      for 2AD-FHV, 2AD-FTV
      Tester Connection Condition Specified Condition
      G44-4 (EFIO) - A61-16 (IMI)*1 Always Below 1 Ω
      G82-13 (EFIO) - A61-16 (IMI)*2
      A61-16 (IMI) - Body ground Always 10 kΩ or higher
      G44-4 (EFIO) - Body ground*1 Always 10 kΩ or higher
      G82-13 (EFIO) - Body ground*2 Always 10 kΩ or higher

      • *1: w/ ID code box (Immobiliser Code ECU)

      • *2: w/o ID code box (Immobiliser Code ECU)

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

      Standard Voltage
      for 3ZR-FE, 3ZR-FAE, 2AR-FE
      Tester Connection Condition Specified Condition
      A62-28 (IMI) - Body ground Always Below 1 V
      G44-4 (EFIO) - Body ground*1 Always Below 1 V
      G82-13 (EFIO) - Body ground*2 Always Below 1 V
      for 2WW
      Tester Connection Condition Specified Condition
      A62-34 (IMI) - Body ground Always Below 1 V
      G44-4 (EFIO) - Body ground*1 Always Below 1 V
      G82-13 (EFIO) - Body ground*2 Always Below 1 V
      for 2AD-FHV, 2AD-FTV
      Tester Connection Condition Specified Condition
      A61-16 (IMI) - Body ground Always Below 1 V
      G44-4 (EFIO) - Body ground*1 Always Below 1 V
      G82-13 (EFIO) - Body ground*2 Always Below 1 V

      • *1: w/ ID code box (Immobiliser Code ECU)

      • *2: w/o ID code box (Immobiliser Code ECU)

      Result
      Proceed to
      OK (w/ ID code box [Immobiliser Code ECU])
      OK (w/o ID code box [Immobiliser Code ECU])
      NG

    OK (w/o ID code box [Immobiliser Code ECU])

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK (w/ ID code box [Immobiliser Code ECU])

  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 the Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  6. REGISTER RECOGNITION CODES


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to the Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  7. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to the Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  8. CLEAR DTC


    1. Clear the DTCs.

      Click here


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

    NEXT

  9. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Powertrain > Engine > Trouble Codes
      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 (for 2AR-FE)
      DTC B279A is output (for 3ZR-FAE)
      DTC B279A is output (for 3ZR-FE)
      DTC B279A is output (for 2WW)
      DTC B279A is output (for 2AD-FTV)
      DTC B279A is output (for 2AD-FHV)

    DTC B279A is not output

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

    DTC B279A is output (for 2AR-FE)

    REPLACE ECM Click here

    DTC B279A is output (for 3ZR-FAE)

    REPLACE ECM Click here

    DTC B279A is output (for 3ZR-FE)

    REPLACE ECM Click here

    DTC B279A is output (for 2WW)

    REPLACE ECM Click here

    DTC B279A is output (for 2AD-FTV)

    REPLACE ECM Click here

    DTC B279A is output (for 2AD-FHV)

    REPLACE ECM Click here

  10. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


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

      Tech Tips

      Refer to the Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  11. REGISTER RECOGNITION CODES


    1. Register the recognition codes in the ECUs.

      Tech Tips

      Refer to the Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  12. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to the Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  13. CLEAR DTC


    1. Clear the DTCs.

      Click here


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

    NEXT

  14. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Powertrain > Engine > Trouble Codes
      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 (for 2AR-FE)
      DTC B279A is output (for 3ZR-FAE)
      DTC B279A is output (for 3ZR-FE)
      DTC B279A is output (for 2WW)
      DTC B279A is output (for 2AD-FTV)
      DTC B279A is output (for 2AD-FHV)

    DTC B279A is not output

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

    DTC B279A is output (for 2AR-FE)

    REPLACE ECM Click here

    DTC B279A is output (for 3ZR-FAE)

    REPLACE ECM Click here

    DTC B279A is output (for 3ZR-FE)

    REPLACE ECM Click here

    DTC B279A is output (for 2WW)

    REPLACE ECM Click here

    DTC B279A is output (for 2AD-FTV)

    REPLACE ECM Click here

    DTC B279A is output (for 2AD-FHV)

    REPLACE ECM Click here