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

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION


DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2799

Either condition is met (1 trip detection logic*4):


  • A malfunction in the communication or communication lines between the ECM and ID code box (immobiliser code ECU)*1 or certification ECU (smart key ECU assembly)*2.

  • A matching communication code cannot be verified during communication between the ECM and ID code box (immobiliser code ECU)*1 or certification ECU (smart key ECU assembly)*2.

  • ID code box (immobiliser code ECU)*1

  • Certification ECU (smart key ECU assembly)*2

  • ECM

  • Telephone transceiver assembly*3

  • Wire harness or connector

Either condition is met:


  • Within 10 seconds of an engine start operation being performed (with the shift lever in P and the brake pedal depressed, the engine switch is pressed while carrying the key). If there is a malfunction, the engine stops (communication begins within 3 seconds of the engine start operation being performed, and DTCs are stored after 6 seconds).

  • 10 seconds after the engine switch is turned on (IG) after reconnecting the cable to the negative (-) battery terminal (communication begins within 3 seconds of the engine switch being turned on (IG), and DTCs are stored after 6 seconds).

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 Code Data List and Active Test
B2799 -

WIRING DIAGRAM


  1. w/o Blocking System

    A01EUJRE01

  2. w/ Blocking System

    A01EVQXE01

INSPECTION PROCEDURE

Note


  • When replacing the certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU) or telephone transceiver assembly*, refer to the Service Bulletin.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

  • When the telephone transceiver assembly is replaced, it is necessary to set the contract mode.*


Tech Tips

When DTC B2799 and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.

PROCEDURE


  1. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/o Blocking System A
      w/ Blocking System B

    B

    CHECK HARNESS AND CONNECTOR (ECM - TELEPHONE TRANSCEIVER ASSEMBLY) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU)*3 OR CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)*4 - ECM)


    1. Disconnect the A25 ECM connector.

    2. Disconnect the I20 ID code box (immobiliser code ECU) connector.*3

    3. Disconnect the A43 certification ECU (smart key ECU assembly) connector.*4


      • *3: w/o Wireless Door Lock Buzzer Answer Back Function

      • *4: w/ Wireless Door Lock Buzzer Answer Back Function

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

      Standard Resistance
      for 2GR-FE
      Tester Connection Condition Specified Condition

      I20-3 (EFII) - A25-30 (IMO)*3

      A43-14 (EFII) - A25-30 (IMO)*4

      		 Always Below 1 Ω
      A25-30 (IMO) - Body ground Always 10 kΩ or higher

      I20-4 (EFIO) - A25-31 (IMI)*3

      A43-13 (EFIO) - A25-31 (IMI)*4

      		 Always Below 1 Ω
      A25-31 (IMI) - Body ground Always 10 kΩ or higher
      for 2AR-FE
      Tester Connection Condition Specified Condition

      I20-3 (EFII) - A25-29 (IMO)*3

      A43-14 (EFII) - A25-29 (IMO)*4

      		 Always Below 1 Ω
      A25-29 (IMO) - Body ground Always 10 kΩ or higher

      I20-4 (EFIO) - A25-28 (IMI)*3

      I20-13 (EFIO) - A25-28 (IMI)*4

      		 Always Below 1 Ω
      A25-28 (IMI) - Body ground Always 10 kΩ or higher

      • *3: w/o Wireless Door Lock Buzzer Answer Back Function

      • *4: w/ Wireless Door Lock Buzzer Answer Back Function


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to the Service Bulletin.


    NEXT

  4. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  5. CHECK DTC OUTPUT


    1. Check for DTCs Click here.

      Tech Tips

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

      OK
      DTC B2799 is not output.

    NG

    REPLACE ECM Click here

    OK

    END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED)

  6. CHECK HARNESS AND CONNECTOR (ECM - TELEPHONE TRANSCEIVER ASSEMBLY)


    1. Disconnect the A25 ECM connector.

    2. Disconnect the I70 telephone transceiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I70-8 (BLK3) - A25-31 (IMI) Always Below 1 Ω
      A25-30 (IMO) - Body ground Always 10 kΩ or higher
      I70-7 (BLK2) - A25-30 (IMO) Always Below 1 Ω
      A25-31 (IMI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - TELEPHONE TRANSCEIVER ASSEMBLY)


    1. Disconnect the A43 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I70-1 (BLK1) - A43-14 (EFII) Always Below 1 Ω
      A43-13 (EFIO) - Body ground Always 10 kΩ or higher
      I70-2 (BLK4) - A43-13 (EFIO) Always Below 1 Ω
      A43-14 (EFII) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. ECU COMMUNICATION ID REGISTRATION


    1. Register the ECU communication ID.

      Tech Tips

      Refer to the Service Bulletin.


    NEXT

  9. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  10. CHECK DTC OUTPUT


    1. Check for DTCs Click here.

      Tech Tips

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

      OK
      DTC B2799 is not output.

    NG

    REPLACE TELEPHONE TRANSCEIVER ASSEMBLY Click here

    OK

    END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED)

  11. REPLACE TELEPHONE TRANSCEIVER ASSEMBLY


    1. Temporarily replace the telephone transceiver assembly with a new or known good one.

      Tech Tips

      Refer to the Service Bulletin.


    NEXT

  12. ECU COMMUNICATION ID REGISTRATION


    1. Register the ECU communication ID.

      Tech Tips

      Refer to the Service Bulletin.


    NEXT

  13. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  14. CHECK DTC OUTPUT


    1. Check for DTCs Click here.

      Tech Tips

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

      OK
      DTC B2799 is not output.

    NG

    REPLACE ECM Click here

    OK

    END (TELEPHONE TRANSCEIVER ASSEMBLY WAS DEFECTIVE)

  15. REPLACE ECM


    1. Temporarily replace the ECM with a new or known good one Click here for 2GR-FE, Click here for 2AR-FE).


    NEXT

  16. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  17. CHECK DTC OUTPUT


    1. 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 (w/o Wireless Door Lock Buzzer Answer Back Function) B
      NG (w/ Wireless Door Lock Buzzer Answer Back Function) C

    B

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    C

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    A

    END (ECM WAS DEFECTIVE)