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, the certification ECU stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2790

ID BOX EEPROM Malfunction

An internal malfunction occurs in the ID code box (EEPROM access malfunction) (1 trip detection logic*).

  • ID code box

  • Certification ECU

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

  • *: Only output while a malfunction is present.

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Operation when Malfunction Detected

  • Engine running: Engine cannot be started next time

  • Engine stopped: Engine cannot be started

-
Table 2. Related Data List and Active Test

DTC Code

Data List and Active Test

B2790

-

CAUTION / NOTICE / HINT

Note:

  • Before replacing the certification ECU, 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

    1. Replace the ID code box (Refer to the Service Bulletin).

    Result

    Result

    NEXT
    NEXT

  2. CLEAR DTC

    1. Clear the DTCs.

      Click here

      Body Electrical > Entry&Start > Clear DTCs

    Result

    Result

    NEXT
    NEXT

  3. REGISTER RECOGNITION CODES

    1. Register the recognition codes in the ECUs (Refer to the Service Bulletin).

    Result

    Result

    NEXT
    NEXT

  4. REGISTER ECU COMMUNICATION ID

    1. Register the ECU communication ID (Refer to the Service Bulletin).

    Result

    Result

    NEXT
    NEXT

  5. CHECK FOR DTC

    1. Check for DTCs.

      Click here

      Body Electrical > Entry&Start > Trouble Codes

      Tip:

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

      OK

      DTC B2790 is not output.

      Result

      Result

      OK

      NG
    OK

    END (ID CODE BOX IS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU