ENGINE 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

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. DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B279A Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high.

  • Harness or connector

  • ECM

  • Transponder key ECU assembly

 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

A01BEGNE03

INSPECTION PROCEDURE

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".

  • 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.

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 ECU assembly.

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

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


    • *1: for 1TR-FE, 2TR-FE

    • *2: for 1KD-FTV (w/o DPF)

    • *3: for 1KD-FTV (w/ DPF)

    • *4: for 2KD-FTV


    1. Disconnect the H60 transponder key ECU assembly connector.

    2. Disconnect the B71*1, B72*2, B73*3 or B88*4 ECM connector.

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

      Standard Resistance
      for 1TR-FE, 2TR-FE
      Tester Connection Condition Specified Condition
      H60-13 (EFIO) - B71-11 (IMI) Always Below 1 Ω
      H60-13 (EFIO) - Body ground Always 10 kΩ or higher
      B71-11 (IMI) - Body ground Always 10 kΩ or higher
      for 1KD-FTV (w/o DPF)
      Tester Connection Condition Specified Condition
      H60-13 (EFIO) - B72-16 (IMI) Always Below 1 Ω
      H60-13 (EFIO) - Body ground Always 10 kΩ or higher
      B72-16 (IMI) - Body ground Always 10 kΩ or higher
      for 1KD-FTV (w/ DPF)
      Tester Connection Condition Specified Condition
      H60-13 (EFIO) - B73-16 (IMI) Always Below 1 Ω
      H60-13 (EFIO) - Body ground Always 10 kΩ or higher
      B73-16 (IMI) - Body ground Always 10 kΩ or higher
      for 2KD-FTV
      Tester Connection Condition Specified Condition
      H60-13 (EFIO) - B88-16 (IMI) Always Below 1 Ω
      H60-13 (EFIO) - Body ground Always 10 kΩ or higher
      B88-16 (IMI) - 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 with a new one.


    NEXT

  6. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  7. 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.
      Result
      Result Proceed to
      DTC B279A is not output A
      DTC B279A is output (for 1TR-FE) B
      DTC B279A is output (for 2TR-FE) C
      DTC B279A is output (for 1KD-FTV) D
      DTC B279A is output (for 2KD-FTV) E

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

    REPLACE ECM Click here

    A

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)