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).

*: Only output while a malfunction is present.

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	-

CAUTION / NOTICE / HINT

Note

Before replacing the certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU) or transmission control 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

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)
1. Replace the ID code box (immobiliser code ECU).
  
  Tech Tips
  
  Refer to the Service Bulletin.
NEXT
CLEAR DTC
1. Clear the DTCs Click here.
NEXT
REGISTER RECOGNITION CODES
1. Register the recognition codes in the ECUs.
  
  Tech Tips
  
  Refer to the Service Bulletin.
NEXT
REGISTER ECU COMMUNICATION ID
1. Register the ECU communication ID.
  
  Tech Tips
  
  Refer to the Service Bulletin.
NEXT
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.
OK
END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)

NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)