B2799

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: 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

INSPECTION PROCEDURE

1. CHECK DTC OUTPUT

1. Delete the DTC (Click here).

2. 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.

2. 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)

1. Disconnect the J69 ECU and A6 ECM connectors.

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

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   J69-5 (EFII) - A6-7 (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