ENGINE IMMOBILISER SYSTEM(w/ Entry and Start 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 engine switch is turned off or on (IG) while carrying the electrical key transmitter).

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	-

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) and ID code box (immobiliser code ECU), 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.

PROCEDURE

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