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ENGINE IMMOBILISER SYSTEM (w/o Smart 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 detects errors in its own communications with the transponder key ECU assembly; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the transponder key ECU assembly and ECM is different and an engine start is attempted. Before troubleshooting this DTC, make sure no transponder key ECU assembly DTCs are present. If present, troubleshoot the transponder key ECU assembly DTCs first.

DTC No. DTC Detection Condition Trouble Area
B2799

One of following conditions is met:


  • Error in communication between ECM and transponder key ECU assembly

  • Error in communication lines

  • Communication ID is different between ECM and transponder key ECU assembly during communication

  • Wire harness or connector

  • ECM

  • Transponder key ECU assembly
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • If the transponder key ECU assembly is replaced, register the key and ECU communication ID.

  • If the ECM is replaced, register the ECU communication ID.

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT


    1. Clear the DTCs (Click here).

    2. Recheck for DTCs.

      OK
      B2799 is not output.

  2. Click here

    RE-REGISTER ECU COMMUNICATION ID


    1. Re-register the ECU communication ID.


  3. Click here

    CHECK DTC OUTPUT


    1. Clear the DTCs (Click here).

    2. Recheck for DTCs.

      OK
      B2799 is not output.

  4. Click here

    CHECK CONNECTION OF CONNECTOR


    1. Turn the ignition switch off.

    2. Check that the connectors are properly connected to the ECM and the transponder key ECU assembly.

      OK
      Connectors are properly connected.

  5. Click here

    CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)


    1. Disconnect the transponder key ECU assembly and ECM connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D37-12 (EFII) - D55-20 (IMO) Always Below 1 Ω
      D37-13 (EFIO) - D55-14 (IMI) Always Below 1 Ω
      D37-12 (EFII) - Body ground Always 10 kΩ or higher
      D37-13 (EFIO) - Body ground Always 10 kΩ or higher

  6. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  7. Click here

    REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.


  8. Click here

    CHECK DTC OUTPUT


    1. Clear the DTCs (Click here).

    2. Recheck for DTCs.

      OK
      B2799 is not output.

  9. Click here

    USE SIMULATION METHOD TO CHECKClick here

  10. Click here

    END (PROBLEM WITH ECU COMMUNICATION ID IS DEFECTIVE)

  11. Click here

    CONNECT CONNECTORS PROPERLY

  12. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. Click here

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

  14. Click here

    END (ECM WAS DEFECTIVE)