ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2790

DTC Code DTC Name
B2790 ID BOX EEPROM Malfunction

DESCRIPTION

When an internal malfunction occurs in the ID code box (immobiliser code ECU), the certification ECU (smart key ECU assembly) stores this DTC.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2790 An internal malfunction occurs in the ID code box (immobiliser code ECU) (EEPROM access malfunction) (1 trip detection logic*).

  • ID code box (immobiliser code ECU)

  • Certification ECU (smart key ECU assembly)

 An immobiliser set/unset operation is performed (the power switch is turned off or on (IG) while carrying the key).

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected

  • Power switch on (READY): Hybrid control system cannot be started next time

  • Hybrid control system stopped: Hybrid control system cannot be started

 -
Related Data List and Active Test
DTC Code Data List and Active Test
B2790 -

INSPECTION PROCEDURE

Note


  • Before replacing the certification ECU (smart key ECU assembly), refer to the Service Bulletin.

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

PROCEDURE


  1. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Replace the ID code box (immobiliser code ECU).


    NEXT

  2. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  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. CHECK FOR DTC


    1. Check for DTCs Click here.

      Tech Tips

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

      OK
      DTC B2790 is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)