ENGINE IMMOBILISER SYSTEM (w/ 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 an error in its own communication with the certification ECU (smart key ECU assembly); 2) the ECM detects an error in the communication lines; or 3) the ECU communication ID between the certification ECU (smart key ECU assembly) and ECM is different when 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 certification ECU (smart key ECU assembly)

  • Error in communication lines

  • Communication ID is different between certification ECU (smart key ECU assembly) and ECM during communication

  • Wire harness or connector

  • ECM

  • Certification ECU (Smart key ECU assembly)

WIRING DIAGRAM

A01EL7BE05

INSPECTION PROCEDURE

Note

If the certification ECU (smart key ECU assembly) is replaced, register the key (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 CONNECTOR CONNECTION CONDITION Click here

    OK

    END (ECU COMMUNICATION ID WAS INCORRECT)

  4. CHECK CONNECTOR CONNECTION CONDITION


    1. Turn the engine switch off.

    2. Check that the connectors are properly connected to the ECM and certification ECU (smart key ECU assembly).

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  5. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ECM)


    1. Disconnect the certification ECU (smart key ECU assembly) connector.

    2. A01ELPDE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU (Smart 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
      D25-34 (EFII) - A49-10 (IMO) Always Below 1 Ω
      D25-35 (EFIO) - A49-11 (IMI) Always Below 1 Ω
      D25-34 (EFII) - Body ground Always 10 kΩ or higher
      D25-35 (EFIO) - 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. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (ECM WAS DEFECTIVE)