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ENGINE IMMOBILISER SYSTEM (w/ Entry and Start System), Diagnostic DTC:B2799

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DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction
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DESCRIPTION

This DTC is output when one of the following occurs: 1) the ECM detected errors in its own communications with the ID code box (immobiliser code ECU); 2) the ECM detects errors 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.

Before troubleshooting for this DTC, make sure no certification ECU DTCs are stored. If stored, troubleshoot the certification ECU DTCs first.

DTC Code DTC Detection Condition Trouble Area
B2799

One of following conditions is met:


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

  • Error in the communication lines.

  • The communication ID is different during communication with the ID code box (immobiliser code ECU).

  • Harness or connector

  • ECM

  • ID code box (immobiliser code ECU)
A0158ZZE31
A0156XVE02
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CLEAR DTC


    1. Clear the DTCs (Click here).


  2. Click here

    CHECK FOR DTC


    1. Check for DTCs (Click here).

      OK
      DTC B2799 is not output.

  3. Click here

    REREGISTER ECU CODE


    1. Reregister the recognition codes in the ECUs.


  4. Click here

    CLEAR DTC


    1. Clear the DTCs (Click here).


  5. Click here

    CHECK FOR DTC


    1. Check for DTCs (Click here).

      OK
      DTC B2799 is not output.

  6. Click here

    CHECK CONNECTION OF CONNECTOR


    1. Turn the engine switch off.

    2. Check that the connectors are properly connected to the ECM and the ID code box.

      OK
      Connectors are properly connected.

  7. Click here

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


    1. A015DYLE21

      Disconnect the E28 ID code box connector.

    2. A015DYLE22

      Disconnect the A38*1 or A52*2 ECU connector.

      Tip:

      • *1: for LHD

      • *2: for RHD

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


      1. for 1UR-FE

        Standard Resistance
        Tester Connection Condition Specified Condition
        E28-5 (EFII) - A38*1-29 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A38*1-40 (IMI)
        E28-5 (EFII) or A38*1-29 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A38*1-40 (IMI) - Body ground
        E28-5 (EFII) - A52*2-29 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A52*2-40 (IMI)
        E28-5 (EFII) or A52*2-29 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A52*2-40 (IMI) - Body ground
        Tip:

        • *1: for LHD

        • *2: for RHD

      2. for 1GR-FE, 1VD-FTV

        Standard Resistance
        Tester Connection Condition Specified Condition
        E28-5 (EFII) - A38*1-10 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A38*1-11 (IMI)
        E28-5 (EFII) or A38*1-10 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A38*1-11 (IMI) - Body ground
        E28-5 (EFII) - A52*2-10 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A52*2-11 (IMI)
        E28-5 (EFII) or A52*2-10 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A52*2-11 (IMI) - Body ground
        Tip:

        • *1: for LHD

        • *2: for RHD

      3. for 3UR-FE

        Standard Resistance
        Tester Connection Condition Specified Condition
        E28-5 (EFII) - A38-29 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A38-40 (IMI)
        E28-5 (EFII) or A38-29 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A38-40 (IMI) - Body ground

  8. Click here

    REPLACE ECM


    1. for 1GR-FE


      1. Temporarily replace the ECM with a new one (Click here).

    2. for 1UR-FE


      1. Temporarily replace the ECM with a new one (Click here).

    3. for 1VD-FTV


      1. Temporarily replace the ECM with a new one (Click here).

    4. for 3UR-FE


      1. Temporarily replace the ECM with a new one (Click here).


  9. Click here

    REGISTER ECU CODE


    1. Register the recognition codes in the ECUs.


  10. Click here

    CLEAR DTC


    1. Clear the DTCs (Click here).


  11. Click here

    CHECK FOR DTC


    1. Check for DTCs (Click here).

      OK
      DTC B2799 is not output.

  12. Click here

    END (ECM IS DEFECTIVE)

  13. Click here

    USE SIMULATION METHOD TO CHECKClick here

  14. Click here

    END (RECOGNITION CODE IN ECU IS DEFECTIVE)

  15. Click here

    CONNECT CONNECTORS PROPERLY

  16. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. Click here

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)