ENGINE IMMOBILISER SYSTEM(w/o Entry and Start System), Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

The ECM stores this DTC when the communication line between the ECM and transponder key ECU assembly is malfunctioning or the communication ID of the ECM and transponder key ECU assembly do not match.

DTC No. DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2799

One of the following conditions is met:


  • Error in communication between ECM and transponder key ECU assembly.

  • Error in communication lines.

  • Communication ID is different during communication between ECM and transponder key ECU assembly.

  • Wire harness or connector

  • Transponder key ECU

  • ECM

  • Start the engine and wait 10 seconds.*1

  • After disconnecting and reconnecting the cable to the negative (-) battery terminal, turn the ignition switch to ON and wait 10 seconds.*2

    *1: Communication starts within 3 seconds of starting the engine. If verification fails, this DTC is stored 6 seconds after communication has completed.

    *2: Communication starts within 3 seconds of turning the ignition switch to ON. If verification fails, this DTC is stored 6 seconds after communication has completed.
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine cannot be started -
Related Data List and Active Test
DTC No. Data List and Active Test
B2799 -

WIRING DIAGRAM

B001X6OE12

CAUTION / NOTICE / HINT

Note


  • If the transponder key ECU assembly or ECM is replaced, refer to Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

  • When using the GTS with the vehicle ignition switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Immobiliser. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

Tech Tips

If transponder key ECU assembly DTCs are output simultaneously, troubleshoot the transponder key ECU assembly DTCs first.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Start the engine.

    2. Check for DTCs Click here.

      Tech Tips

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

      OK
      DTC B2799 is not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B2799 is output) B
      NG (Other DTCs are output) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    B

  3. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  4. CHECK WHETHER ENGINE STARTS


    1. Using a registered key, turn the ignition switch to ON.

    2. Check that the engine starts 5 seconds after the ignition switch was turned to ON.

      OK
      Engine starts normally.

    OK

    END (ECU COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    NG

  5. REPLACE ECM


    1. Temporarily replace the ECM with a new one or known good one.



    NEXT

  6. CHECK WHETHER ENGINE STARTS


    1. Using a registered key, turn the ignition switch to ON.

    2. Check that the engine starts 5 seconds after the ignition switch was turned to ON.

      OK
      Engine starts normally.

    OK

    END (ECM WAS DEFECTIVE)

    NG

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


    1. Disconnect the E96 transponder key ECU assembly connector.

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


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      E96-12 (EFII) - A38-29 (IMO) Always Below 1 Ω
      E96-13 (EFIO) - A38-40 (IMI) Always Below 1 Ω
      E96-12 (EFII) - Body ground Always 10 kΩ or higher
      E96-13 (EFIO) - Body ground Always 10 kΩ or higher
      A38-29 (IMO) - Body ground Always 10 kΩ or higher
      A38-40 (IMI) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      E96-12 (EFII) - A52-29 (IMO) Always Below 1 Ω
      E96-13 (EFIO) - A52-40 (IMI) Always Below 1 Ω
      E96-12 (EFII) - Body ground Always 10 kΩ or higher
      E96-13 (EFIO) - Body ground Always 10 kΩ or higher
      A52-29 (IMO) - Body ground Always 10 kΩ or higher
      A52-40 (IMI) - Body ground Always 10 kΩ or higher

    OK

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR