Dtc B2799 Engine Immobiliser System

Lexus IS250 IS220d GSE20 ALE20 - ENGINE IMMOBILISER

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 ConditionTrouble Area
B2799One of following conditions is met:
Error in communication between ECM and ID code box
Error in communication lines
Communication ID is different during communication with ID code box
Wire harness
ID code box
ECM

WIRING DIAGRAM

Dtc B2799 Engine Immobiliser System. ENGINE IMMOBILISER. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK DTC OUTPUT

Delete the DTC .

Recheck for DTC .

  • Result:
  • ResultProceed to
    B2791 output does not reoccurA
    B2791 output reoccursB
B
GO TO DTC
A
2.ECU COMMUNICATION ID REGISTRATION

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

Check for DTC .

  • Result:
  • ResultProceed to
    B2799 output reoccursA
    B2799 does not reoccurB
B
END
A
3.CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)
Dtc B2799 Engine Immobiliser System. ENGINE IMMOBILISER. Lexus IS250 IS220d GSE20 ALE20

Disconnect the J69 ECU and A49 ECM connectors.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    J69-5 (EFII) - A49-15 (IMO)AlwaysBelow 1 Ω
    J69-5 (EFII) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4.REPLACE ID CODE BOX

Replace the ID code box.

NEXT
5.KEY REGISTRATION

Register the electrical key code in the certification ECU.

NEXT
6.ECU COMMUNICATION ID REGISTRATION

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

NEXT
7.CHECK DTC OUTPUT

Check for DTC .

  • Result:
  • ResultProceed to
    B2799 output reoccursA
    B2799 does not reoccurB
A
REPLACE ECM
B
END