ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

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

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 Code DTC Detection Condition Trouble Area
B2799

One of the following conditions is met:


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

  • Error in communication lines

  • Communication ID is different between ID code box (immobiliser code ECU) and ECM during communication

  • Wire harness or connector

  • ECM

  • ID code box (immobiliser code ECU)

WIRING DIAGRAM

A01CCTSE24

INSPECTION PROCEDURE

Note


  • If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID.

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

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      B2799 output does not recur.

    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.


    NEXT

  3. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      B2799 output does not recur.

    NG

    CHECK CONNECTOR CONNECTION CONDITION Click here

    OK

    END (ECU COMMUNICATION ID IS DEFECTIVE)

  4. CHECK CONNECTOR CONNECTION CONDITION


    1. Turn the engine switch off.

    2. Check that the connectors are properly connected to the ECM and the ID code box (immobiliser code ECU).

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  5. CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)


    1. Disconnect the ID code box (immobiliser code ECU) connector.

    2. Disconnect the ECM connector.

      A01CDZTE20

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G15-5 (EFII) - A8-10 (IMO) Always Below 1 Ω
      G15-6 (EFIO) - A8-11 (IMI) Always Below 1 Ω
      G15-5 (EFII) - Body ground Always 10 kΩ or higher
      G15-6 (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 for 2GR-FE, Click here for 2AZ-FE).


    NEXT

  7. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.


    NEXT

  8. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      B2799 output does not recur.

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

    END (ECM IS DEFECTIVE)