ENGINE IMMOBILISER SYSTEM (w/o 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 transponder key ECU assembly; 2) the ECM detects errors in the communication lines; or 3) the ECU - ECM communication ID between the transponder key ECU assembly and ECM is different and an engine start is attempted. Before troubleshooting for this DTC, make sure no engine immobiliser DTCs are output. If output, troubleshoot the engine immobiliser DTCs first.

DTC Code DTC Detection Condition Trouble Area
B2799

One of the following conditions is met:


  • An error in communication between the ECM and transponder key ECU assembly.

  • An error in the communication lines.

  • The ECU - ECM communication ID is different during communication with the transponder key ECU assembly.

  • Harness or connector

  • Transponder key ECU assembly

  • ECM

WIRING DIAGRAM

A01DU3OE22
A01DU3OE21

INSPECTION PROCEDURE

Note

When replacing the transponder key ECU assembly and/or ECM, refer to the Service Bulletin.

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.

    NG

    REREGISTER ECU - ECM COMMUNICATION ID Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. REREGISTER ECU - ECM COMMUNICATION ID


    1. Reregister the ECU - ECM communication ID (Refer to the Service Bulletin).


    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.

    NG

    CHECK CONNECTION OF CONNECTOR Click here

    OK

    END

  6. CHECK CONNECTION OF CONNECTOR


    1. Turn the ignition switch off.

    2. Check that the connectors are properly connected to the ECM and transponder key ECU assembly.

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTOR CORRECTLY

    OK

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


    1. Disconnect the G138*1 or G74*2 ECU connector.


      • *1: for 5L-E

      • *2: except 5L-E

    2. Disconnect the G60*1, G56*2, G58*3 or G61*4 ECM connector.


      • *1: for 2TR-FE

      • *2: for 1GR-FE

      • *3: for 1KD-FTV

      • *4: for 5L-E

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

      Standard Resistance
      for 2TR-FE
      Tester Connection Condition Specified Condition
      G74-13 (EFIO) - G60-31 (IMI) Always Below 1 Ω
      G74-12 (EFII) - G60-32 (IMO)
      G74-13 (EFIO) or G60-31 (IMI) - Body ground Always 10 kΩ or higher
      G74-12 (EFII) or G60-32 (IMO) - Body ground
      for 1GR-FE
      Tester Connection Condition Specified Condition
      G74-13 (EFIO) - G56-14 (IMI) Always Below 1 Ω
      G74-12 (EFII) - G56-20 (IMO)
      G74-13 (EFIO) or G56-14 (IMI) - Body ground Always 10 kΩ or higher
      G74-12 (EFII) or G56-20 (IMO) - Body ground
      for 1KD-FTV
      Tester Connection Condition Specified Condition
      G74-13 (EFIO) - G58-28 (IMI) Always Below 1 Ω
      G74-12 (EFII) - G58-29 (IMO)
      G74-13 (EFIO) or G58-28 (IMI) - Body ground Always 10 kΩ or higher
      G74-12 (EFII) or G58-29 (IMO) - Body ground
      for 5L-E
      Tester Connection Condition Specified Condition
      G138-13 (EFIO) - G61-17 (IMI) Always Below 1 Ω
      G138-12 (EFII) - G61-6 (IMO)
      G138-13 (EFIO) or G61-17 (IMI) - Body ground Always 10 kΩ or higher
      G138-12 (EFII) or G61-6 (IMO) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE TRANSPONDER KEY ECU ASSEMBLY


    1. Temporarily replace the transponder key ECU assembly with a new one (Refer to the Service Bulletin).


    NEXT

  9. REREGISTER ECU - ECM COMMUNICATION ID


    1. Reregister the ECU - ECM communication ID (Refer to the Service Bulletin).


    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.
      Result
      Result Proceed to
      OK A
      NG (for 2TR-FE) B
      NG (for 1GR-FE) C
      NG (for 1KD-FTV) D
      NG (for 5L-E) E

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

    REPLACE ECM Click here

    A

    END (TRANSPONDER KEY ECU IS DEFECTIVE)