ENGINE IMMOBILISER SYSTEM (w/o 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 transponder key ECU assembly is stuck on HI output, the ECM stores this DTC.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B279A The communication line (IMI - EFIO) between the ECM and transponder key ECU assembly is stuck on HI output (1 trip detection logic*).

  • Harness or connector

  • Transponder key ECU assembly

  • ECM

 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 start is prohibited
Related Data List and Active Test
DTC Code Data List and Active Test
B279A -

WIRING DIAGRAM

A0157JBE05

INSPECTION PROCEDURE

Note


  • When replacing the transponder key ECU assembly, refer to the Service Bulletin.

  • When replacing the ECM, refer to Initialization Click here.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Tech Tips

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

      OK
      DTC B279A is not output.

    NG

    CHECK CONNECTION OF CONNECTOR Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK CONNECTION OF CONNECTOR


    1. Check that the connectors are properly connected to the ECM and transponder key amplifier assembly.

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

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


    1. Disconnect the E96 transponder key ECU assembly 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 LHD
      Tester Connection Condition Specified Condition
      E96-13 (EFIO) - A38-11 (IMI) Always Below 1 Ω
      E96-13 (EFIO) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      E96-13 (EFIO) - A52-11 (IMI) Always Below 1 Ω
      E96-13 (EFIO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE TRANSPONDER KEY ECU ASSEMBLY


    1. Replace the transponder key ECU assembly.


    NEXT

  6. REGISTER KEY


    1. Register the key (refer to the Service Bulletin).


    NEXT

  7. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID (refer to the Service Bulletin).


    NEXT

  8. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts with the key.

      OK
      Engine starts normally.
      Result
      Result Proceed to
      OK A
      NG (for 1GR-FE) B
      NG (for 1VD-FTV) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

    END (TRANSPONDER KEY ECU WAS DEFECTIVE)