Dtc B2799 Engine Immobiliser System

Securities. Lexus Is250, Is220D. Gse20 Ale20
Engine Immobiliser. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC OUTPUT

ECU COMMUNICATION ID REGISTRATION

CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

REPLACE ID CODE BOX

KEY REGISTRATION

ECU COMMUNICATION ID REGISTRATION

CHECK DTC OUTPUT

DTC B2799 Engine Immobiliser System


DESCRIPTION

This DTC is output when one of the following occurs: 1) the ECM detects errors in its own communications with the ID code box; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the ID code box and ECM is different and an engine start is attempted. Before troubleshooting for this DTC, make sure no certification ECU DTCs are present. If present, troubleshoot the certification ECU DTCs first.

DTC No.
DTC Detection Condition
Trouble Area
B2799
One of following conditions is met:
  1. Error in communication between ECM and ID code box
  2. Error in communication lines
  3. Communication ID is different during communication with ID code box
  1. Wire harness
  2. ID code box
  3. ECM

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Engine Immobiliser.Engine Immobiliser System (For 2Ad-Fhv). Dtc B2799 Engine Immobiliser System


INSPECTION PROCEDURE

1.CHECK DTC OUTPUT

  1. Delete the DTC (Click here).

  1. Recheck for DTC (Click here).

    Result:
    Result
    		Proceed to
    B2791 output does not reoccur
    		A
    B2791 output reoccurs
    		B


B
GO TO DTC
A


2.ECU COMMUNICATION ID REGISTRATION

  1. Register the ECU communication ID between the ID code box and ECM.

  1. Check for DTC (Click here).

    Result:
    Result
    		Proceed to
    B2799 output reoccurs
    		A
    B2799 does not reoccur
    		B


B
END
A


3.CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)


    Lexus Is250, Is220D. Gse20 Ale20.Engine Immobiliser.Engine Immobiliser System (For 2Ad-Fhv). Dtc B2799 Engine Immobiliser System

  1. Disconnect the J69 ECU and A49 ECM connectors.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    J69-5 (EFII) - A49-15 (IMO)
    		Always
    		Below 1 Ω
    J69-5 (EFII) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.REPLACE ID CODE BOX

  1. Replace the ID code box.


NEXT


5.KEY REGISTRATION

  1. Register the electrical key code in the certification ECU.


NEXT


6.ECU COMMUNICATION ID REGISTRATION

  1. Register the ECU communication ID between the ID code box and ECM.


NEXT


7.CHECK DTC OUTPUT

  1. Check for DTC (Click here).

    Result:
    Result
    		Proceed to
    B2799 output reoccurs
    		A
    B2799 does not reoccur
    		B


A
REPLACE ECM
B

END