ENGINE IMMOBILISER SYSTEM (w/o Smart Entry and Start 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 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 for this DTC, make sure that 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 the following conditions is met:


  • Error in communication between ECM and transponder key ECU assembly.

  • Error in communication lines.

  • Communication ID is different during communication with transponder key ECU assembly.

  • Wire harness or connector

  • ECM

  • Transponder key ECU assembly

WIRING DIAGRAM

A01EL7BE07

INSPECTION PROCEDURE

Note


  • If the transponder key ECU assembly is replaced, register the key and ECU communication ID (Refer to Service Bulletin).

  • If the ECM is replaced, register the ECU communication ID (Refer to Service Bulletin).

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.

      Tech Tips

      Refer to Service Bulletin.


    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 CONNECTION OF CONNECTOR Click here

    OK

    END (ECU COMMUNICATION ID WAS NOT REGISTERED CORRECTLY)

  4. CHECK CONNECTION OF CONNECTOR


    1. Turn the ignition switch off.

    2. 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

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


    1. Disconnect the transponder key ECU assembly connector.

    2. A01EJUXE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Transponder Key ECU Assembly)
      *2

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D22-12 (EFII) - A49-10 (IMO) Always Below 1 Ω
      D22-13 (EFIO) - A49-11 (IMI) Always Below 1 Ω
      D22-12 (EFII) - Body ground Always 10 kΩ or higher
      D22-13 (EFIO) - Body ground Always 10 kΩ or higher
      A49-10 (IMO) - Body ground Always 10 kΩ or higher
      A49-11 (IMI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  7. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.


    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 TRANSPONDER KEY ECU ASSEMBLY

    OK

    END (ECM WAS DEFECTIVE)