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

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

DESCRIPTION

When the communication line (EFIO-IMI) between the transponder key ECU assembly and ECM is stuck on HI output, 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 (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck on HI output (1 trip detection logic*).

  • Harness or connector

  • ECM

  • Transponder key ECU 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

B003J82E03
*1 Transponder Key ECU Assembly

CAUTION / NOTICE / HINT

Note


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

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Powertrain > Engine > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. 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
      Result Proceed to
      B279A is not output A
      B279A is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  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 AND BODY GROUND)


    1. Disconnect the G127 transponder key ECU assembly connector.

    2. Disconnect the G50 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G127-13 (EFIO) - G50-16 (IMI) Always Below 1 Ω
      G127-13 (EFIO) - Body ground Always 10 kΩ or higher
      G50-16 (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 Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  6. REGISTER KEY


    1. Register the key.

      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. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts with the key.

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE ECM Click here