ENGINE IMMOBILISER SYSTEM (w/ 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 ID code box; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the ID code box and ECM is different and an engine start is attempted.

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

DTC Code DTC Detection Condition Trouble Area
B2799

One of the following conditions is met:


  • An error in the communication between the ECM and the ID code box.

  • An error in the communication lines.

  • The communication ID is different during communication with the ID code box.

  • Harness or connector

  • ECM

  • ID code box

WIRING DIAGRAM

A005T6YE16

INSPECTION PROCEDURE

Tech Tips

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

PROCEDURE


  1. 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

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


    1. A005VPFE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ID Code Box)
      *2

      Front view of wire harness connector

      (to ECM)

      Disconnect the D26 box connector.

    2. Disconnect the A40 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D26-5 (EFII) - A40-10 (IMO) Always Below 1 Ω
      D26-6 (EFIO) - A40-11 (IMI)
      D26-5 (EFII) or A40-10 (IMO) - Body ground Always 10 kΩ or higher
      D26-6 (EFIO) or A40-11 (IMI) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE ECM


    1. for 1AZ-FE:


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

    2. for 1ZR-FAE:


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

    3. for 2ZR-FAE:


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

    4. for 3ZR-FAE:


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

    5. for 3ZR-FE:


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


    NEXT

  4. REGISTER ECU CODE


    1. Register the recognition codes in the ECUs.


    NEXT

  5. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2799 is not output.

    NG

    REPLACE ID CODE BOX

    OK

    END (ECM IS DEFECTIVE)