ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is stored when one of the following occurs: 1) the ECM detects an error in its own communication with the ID code box (immobiliser code ECU); 2) the ECM detects an error in the communication lines; or 3) the ECU communication ID between the ID code box (immobiliser code ECU) and ECM is different and an engine start is attempted.

Tech Tips

Before troubleshooting this DTC, make sure that no certification ECU (smart key ECU assembly) DTCs are present. If present, troubleshoot the certification ECU (smart key ECU assembly) DTCs first.

DTC No. DTC Detection Condition Trouble Area
B2799

One of the following conditions is met:


  • Error in communication between ECM and ID code box (immobiliser code ECU)

  • Error in communication lines

  • Communication ID is different between ID code box (immobiliser code ECU) and ECM during communication

  • Wire harness or connector

  • ECM

  • ID code box (immobiliser code ECU)

  • Telephone transceiver assembly*

WIRING DIAGRAM


  1. w/o Blocking System

    A019O4WE16

  2. w/ Blocking System

    A019ODXE03

INSPECTION PROCEDURE

Note


  • If the ID code box (immobiliser code ECU) is replaced or telephone transceiver assembly*, register the ECU code and ECU communication ID.

  • When the telephone transceiver assembly is replaced, it is necessary to set the contract mode.*


PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    RE-REGISTER ECU COMMUNICATION ID Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. RE-REGISTER ECU COMMUNICATION ID


    1. Re-register the ECU communication ID.


    NEXT

  3. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    CHECK CONNECTOR CONNECTION CONDITION Click here

    OK

    END (ECU COMMUNICATION ID WAS NOT REGISTERED CORRECTLY)

  4. CHECK CONNECTOR CONNECTION CONDITION


    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.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  5. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/o Blocking System A
      w/ Blocking System B

    B

    CHECK HARNESS AND CONNECTOR (ECM - TELEPHONE TRANSCEIVER ASSEMBLY) Click here

    A

  6. CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)


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

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for 2GR-FE
      Tester Connection Condition Specified Condition
      F45-5 (EFII) - A43-29 (IMO) Always Below 1 Ω
      F45-6 (EFIO) - A43-40 (IMI) Always Below 1 Ω
      A43-29 (IMO) - Body ground Always 10 kΩ or higher
      A43-40 (IMI) - Body ground Always 10 kΩ or higher
      for 1AR-FE
      Tester Connection Condition Specified Condition
      F45-5 (EFII) - A70-10 (IMO) Always Below 1 Ω
      F45-6 (EFIO) - A70-11 (IMI) Always Below 1 Ω
      A70-10 (IMO) - Body ground Always 10 kΩ or higher
      A70-11 (IMI) - Body ground Always 10 kΩ or higher
      Standard Voltage
      for 2GR-FE
      Tester Connection Condition Specified Condition
      A43-29 (IMO) - Body ground Always Below 1 V
      A43-40 (IMI) - Body ground Always Below 1 V
      for 1AR-FE
      Tester Connection Condition Specified Condition
      A70-10 (IMO) - Body ground Always Below 1 V
      A70-11 (IMI) - Body ground Always Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. REPLACE ECM


    1. Replace the ECM.

      Click here for 2GR-FE

      Click here for 1AR-FE


    NEXT

  8. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

    END (ECM WAS DEFECTIVE)

  9. CHECK HARNESS AND CONNECTOR (ECM - TELEPHONE TRANSCEIVER ASSEMBLY)


    1. Disconnect the A43 ECM connector.

    2. Disconnect the G56 telephone transceiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G56-8 (BLK3) - A43-40 (IMI) Always Below 1 Ω
      A43-29 (IMO) - Body ground Always 10 kΩ or higher
      G56-7 (BLK2) - A43-29 (IMO) Always Below 1 Ω
      A43-40 (IMI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - TELEPHONE TRANSCEIVER ASSEMBLY)


    1. Disconnect the F45 ID code box (immobiliser code ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G56-1 (BLK1) - F45-5 (EFII) Always Below 1 Ω
      F45-6 (EFIO) - Body ground Always 10 kΩ or higher
      G56-2 (BLK4) - F45-6 (EFIO) Always Below 1 Ω
      F45-5 (EFII) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to the Service Bulletin.


    NEXT

  12. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  13. CHECK DTC OUTPUT


    1. Check for DTCs Click here.

      Tech Tips

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

      OK
      DTC B2799 is not output.

    NG

    REPLACE TELEPHONE TRANSCEIVER ASSEMBLY Click here

    OK

    END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED)

  14. REPLACE TELEPHONE TRANSCEIVER ASSEMBLY


    1. Temporarily replace the telephone transceiver assembly with a new or known good one.

      Tech Tips

      Refer to the Service Bulletin.


    NEXT

  15. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to the Service Bulletin.


    NEXT

  16. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  17. CHECK DTC OUTPUT


    1. Check for DTCs Click here.

      Tech Tips

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

      OK
      DTC B2799 is not output.

    NG

    REPLACE ECM Click here

    OK

    END (TELEPHONE TRANSCEIVER ASSEMBLY WAS DEFECTIVE)

  18. REPLACE ECM


    1. Temporarily replace the ECM with a new or known good one Click here.


    NEXT

  19. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  20. CHECK DTC OUTPUT


    1. Check for DTCs Click here.

      Tech Tips

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

      OK
      DTC B2799 is not output.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

    END (ECM WAS DEFECTIVE)