ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is output when the ECM detects errors in communication between the transponder key ECU assembly and the ECM.

This DTC is also output when an engine start is attempted while the ECU communication IDs of the transponder key ECU assembly and the ECM are different.

Before troubleshooting for this DTC, make sure that no other DTCs have been detected in the transponder key ECU assembly. If any DTCs relating to key codes have been detected in the transponder key assembly, troubleshoot those DTCs first.

DTC No. DTC Detection Condition Trouble Areas
B2799

-Error in communication between ECM and transponder key ECU assembly, and in communication line

-Communication ID of transponder key ECU assembly and the ECM different

-Wire harness or connector

-Transponder key ECU assembly

-ECM

WIRING DIAGRAM

A0138Z4E07

INSPECTION PROCEDURE

Note


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

  • When the ECM is replaced, reregister the ECU - ECM communication ID.

PROCEDURE


  1. ECU CODE REGISTRATION


    1. Re-register the ECU communication ID between the transponder key ECU and ECM.


    NEXT

  2. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Check for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    CHECK CONNECTION OF CONNECTOR Click here

    OK

    END (ECU COMMUNICATION ID IS DEFECTIVE)

  3. 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.

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

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


    1. A0136LHE01

      Disconnect the C30 transponder key ECU assembly connector.

    2. Disconnect the B26 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C30-12 (EFII) - B26-6 (IMO) Always Below 1 Ω
      C30-13 (EFIO) - B26-39 (IMI) Always Below 1 Ω
      C30-12 (EFII) orB26-6 (IMO) - Body ground Always 10 kΩ or higher
      C30-13 (EFIO) orB26-39 (IMI) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the transponder key ECU assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  6. ECU CODE REGISTRATION


    1. Re-register the ECU communication ID between the transponder key ECU and ECM.


    NEXT

  7. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Check for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    OK

    END (ECM IS DEFECTIVE)