ENGINE 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 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 ID code box (immobiliser code ECU) is stuck high (1 trip detection logic*).

  • Harness or connector

  • ID code box (immobiliser code ECU)

  • 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

B001DB3E03

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 ID code box (immobiliser code ECU) or ECM, refer to Service Bulletin.

  • 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. 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

  2. INSPECT ECM (TERMINAL IMI)


    1. Using an oscilloscope, check the waveform.

      B001D5LC01
      *A for 1GR-FE *B for 2TR-FE
      *C for 1KD-FTV *D for 1GD-FTV
      *E for Automatic Transmission *F for Manual Transmission
      *a

      Component with harness connected

      (ECM)

      		 *b Waveform
      Measurement Condition
      Item Content
      Tester Connection

      G56-10 (IMI) - Body ground*1

      G56-14 (IMI) - Body ground*2

      G181-10 (IMI) - Body ground*3

      G58-28 (IMI) - Body ground*4

      G185-16 (IMI) - Body ground*5
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition Within 3 seconds after engine starts, or within 3 seconds after engine switch turned on (IG) after battery disconnected and reconnected

      • *1: for 1GR-FE (for Automatic Transmission)

      • *2: for 1GR-FE (for Manual Transmission)

      • *3: for 2TR-FE

      • *4: for 1KD-FTV

      • *5: for 1GD-FTV

      OK
      The waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 1GR-FE: Click here for 2TR-FE: Click here for 1KD-FTV: Click here for 1GD-FTV: Click here

    NG

  3. CHECK ECM


    1. Disconnect the G207 ID code box (immobiliser code ECU) connector.

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

      B001HIHC01
      *A for 1GR-FE *B for 2TR-FE
      *C for 1KD-FTV *D for 1GD-FTV
      *E for Automatic Transmission *F for Manual Transmission
      *a

      Component with harness connected

      (ECM)

      		 - -
      Standard Voltage
      for 1GR-FE (for Automatic Transmission)
      Tester Connection Condition Specified Condition
      G56-10 (IMI) - Body ground Always 11 to 14 V
      for 1GR-FE (for Manual Transmission)
      Tester Connection Condition Specified Condition
      G56-14 (IMI) - Body ground Always 11 to 14 V
      for 2TR-FE
      Tester Connection Condition Specified Condition
      G181-10 (IMI) - Body ground Always 11 to 14 V
      for 1KD-FTV
      Tester Connection Condition Specified Condition
      G58-28 (IMI) - Body ground Always 11 to 14 V
      for 1GD-FTV
      Tester Connection Condition Specified Condition
      G185-16 (IMI) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ECM for 1GR-FE: Click here for 2TR-FE: Click here for 1KD-FTV: Click here for 1GD-FTV: Click here

    OK

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


    1. Disconnect the G56*1, G181*2, G58*3 or G185*4 ECM connector.


      • *1: for 1GR-FE

      • *2: for 2TR-FE

      • *3: for 1KD-FTV

      • *4: for 1GD-FTV

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

      Standard Resistance
      for 1GR-FE (for Automatic Transmission)
      Tester Connection Condition Specified Condition
      G207-4 (EFIO) - G56-10 (IMI) Always Below 1 Ω
      G56-10 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 1GR-FE (for Manual Transmission)
      Tester Connection Condition Specified Condition
      G207-4 (EFIO) - G56-14 (IMI) Always Below 1 Ω
      G56-14 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 2TR-FE
      Tester Connection Condition Specified Condition
      G207-4 (EFIO) - G181-10 (IMI) Always Below 1 Ω
      G181-10 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 1KD-FTV
      Tester Connection Condition Specified Condition
      G207-4 (EFIO) - G58-28 (IMI) Always Below 1 Ω
      G58-28 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 1GD-FTV
      Tester Connection Condition Specified Condition
      G207-4 (EFIO) - G185-16 (IMI) Always Below 1 Ω
      G185-16 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR