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

A01IU38E08

INSPECTION PROCEDURE

Note


  • When the ID code box is replaced, reregister the recognition codes and ECU communication ID.

  • for 1WW:

    After turning the engine switch off, make sure to wait at least 6 minutes before disconnecting the ECM connector or replacing the ECM.

PROCEDURE


  1. CHECK CONNECTION OF CONNECTOR


    1. Turn the engine switch off.

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

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

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


    1. Disconnect the H111 box connector.

      A01IOJOE01
      Text in Illustration
      *1 for AD Series Engine *2 for ZR Series Engine
      *3 for 1WW Engine *4

      Front view of wire harness connector

      (to ID Code Box)
      *5

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Disconnect the A51*1*2, A76*3 ECM connector.


      • *1: for AD Series Engine

      • *2: for ZR Series Engine

      • *3: for 1WW Engine

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

      Standard Resistance
      for AD Series Engine
      Tester Connection Condition Specified Condition
      H111-5 (EFII) - A51-15 (IMO) Always Below 1 Ω
      H111-6 (EFIO) - A51-16 (IMI)
      H111-5 (EFII) or A51-15 (IMO) - Body ground Always 10 kΩ or higher
      H111-6 (EFIO) or A51-16 (IMI) - Body ground
      for ZR Series Engine
      Tester Connection Condition Specified Condition
      H111-5 (EFII) - A51-10 (IMO) Always Below 1 Ω
      H111-6 (EFIO) - A51-11 (IMI)
      H111-5 (EFII) or A51-10 (IMO) - Body ground Always 10 kΩ or higher
      H111-6 (EFIO) or A51-11 (IMI) - Body ground
      for 1WW Engine
      Tester Connection Condition Specified Condition
      H111-5 (EFII) - A76-44 (IMO) Always Below 1 Ω
      H111-6 (EFIO) - A76-34 (IMI)
      H111-5 (EFII) or A76-44 (IMO) - Body ground Always 10 kΩ or higher
      H111-6 (EFIO) or A76-34 (IMI) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REGISTER RECOGNITION CODES


    1. Register the recognition codes in the ECUs.


    NEXT

  4. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.


    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 ECM Click here

    OK

    END (ECU COMMUNICATION ID IS NOT REGISTERED CORRECTLY)

  7. REPLACE ECM


    1. for 1AD-FTV:


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

    2. for 2AD-FHV:


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

    3. for 1ZR-FAE:


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

    4. for 2ZR-FAE:


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

    5. for 1WW:


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


    NEXT

  8. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  9. 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)