ENGINE IMMOBILISER SYSTEM(w/ Entry and Start 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 detected errors in its own communications with the ID code box (immobiliser code ECU); 2) the ECM detects errors 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.

Before troubleshooting for this DTC, make sure no certification ECU DTCs are stored. If stored, troubleshoot the certification ECU DTCs first.

DTC Code DTC Detection Condition Trouble Area
B2799

One of following conditions is met:


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

  • Error in the communication lines.

  • The communication ID is different during communication with the ID code box (immobiliser code ECU).

  • Harness or connector

  • ECM

  • ID code box (immobiliser code ECU)

WIRING DIAGRAM

A01X716E03
A01X716E02
A01X6D3E31
for 3UR-FE
*a ID Code Box

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2799 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. REREGISTER ECU CODE


    1. Reregister the recognition codes in the ECUs.


    NEXT

  4. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  5. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2799 is not output.

    OK

    END (RECOGNITION CODE IN ECU IS DEFECTIVE)

    NG

  6. CHECK CONNECTION OF CONNECTOR


    1. Turn the engine switch off.

    2. Check that the connectors are properly connected to the ECM and the ID code box.

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  7. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)


    1. Disconnect the E28 ID code box connector.

      A01X5VLE01

    2. Disconnect the A38*1 or A52*2 ECU connector.

      Tech Tips


      • *1: for LHD

      • *2: for RHD

      A01X5VLE03

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


      1. for 1UR-FE

        Standard Resistance
        Tester Connection Condition Specified Condition
        E28-5 (EFII) - A38*1-29 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A38*1-40 (IMI)
        E28-5 (EFII) or A38*1-29 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A38*1-40 (IMI) - Body ground
        E28-5 (EFII) - A52*2-29 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A52*2-40 (IMI)
        E28-5 (EFII) or A52*2-29 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A52*2-40 (IMI) - Body ground

        Tech Tips


        • *1: for LHD

        • *2: for RHD

      2. for 1GR-FE, 1VD-FTV

        Standard Resistance
        Tester Connection Condition Specified Condition
        E28-5 (EFII) - A38*1-10 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A38*1-11 (IMI)
        E28-5 (EFII) or A38*1-10 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A38*1-11 (IMI) - Body ground
        E28-5 (EFII) - A52*2-10 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A52*2-11 (IMI)
        E28-5 (EFII) or A52*2-10 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A52*2-11 (IMI) - Body ground

        Tech Tips


        • *1: for LHD

        • *2: for RHD

      3. for 3UR-FE

        Standard Resistance
        Tester Connection Condition Specified Condition
        E28-5 (EFII) - A38-29 (IMO) Always Below 1 Ω
        E28-6 (EFIO) - A38-40 (IMI)
        E28-5 (EFII) or A38-29 (IMO) - Body ground Always 10 kΩ or higher
        E28-6 (EFIO) or A38-40 (IMI) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE ECM


    1. for 1GR-FE


      1. Temporarily replace the ECM with a new one Click here.

    2. for 1UR-FE


      1. Temporarily replace the ECM with a new one Click here.

    3. for 1VD-FTV


      1. Temporarily replace the ECM with a new one Click here.

    4. for 3UR-FE


      1. Temporarily replace the ECM with a new one Click here.


    NEXT

  9. REGISTER ECU CODE


    1. Register the recognition codes in the ECUs.


    NEXT

  10. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  11. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2799 is not output.

    OK

    END (ECM IS DEFECTIVE)

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)