B2799

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILIZER SYSTEM: B2799: Engine Immobilizer System Malfunction
B2799 - Engine Immobilizer System Malfunction

DESCRIPTION

This DTC is stored when one of the following occurs: 1) the ECM detects an error in its own communication with the ID code box (immobilizer code ECU); 2) the ECM detects an error in the communication lines; or 3) the ECU communication ID between the ID code box (immobilizer code ECU) and ECM is different and an engine start is attempted.

HINT
Before troubleshooting this DTC, make sure that no certification ECU (smart key ECU assembly) DTCs are present. If present, troubleshoot the certification ECU (smart key ECU assembly) DTCs first.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If the ID code box (immobilizer code ECU) is replaced, register the ECU code and ECU communication ID Engine Immobilizer System.

PROCEDURE

1. CHECK DTC OUTPUT

(a) Clear the DTCs Engine Immobilizer System.

(b) Recheck for DTCs Engine Immobilizer System.

OK:

DTC B2799 is not output.

NG -- RE-REGISTER ECU COMMUNICATION ID

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

2. RE-REGISTER ECU COMMUNICATION ID

(a) Re-register the ECU communication ID Engine Immobilizer System.

NEXT -- Continue to next step.

3. CHECK DTC OUTPUT

(a) Clear the DTCs Engine Immobilizer System.

(b) Recheck for DTCs Engine Immobilizer System.

OK:

DTC B2799 is not output.

NG -- CHECK CONNECTION OF CONNECTOR

OK -- END (ECU COMMUNICATION ID WAS NOT REGISTERED CORRECTLY)

4. CHECK CONNECTION OF CONNECTOR

(a) Turn the engine switch off.

(b) Check that the connectors are properly connected to the ECM and the ID code box (immobilizer code ECU).

OK:

Connectors are properly connected.

NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.

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

(a) Disconnect the ID code box (immobilizer code ECU) connector.

(b) Disconnect the ECM connector.





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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. REPLACE ECM

(a) Replace the ECM Removal for 2GR-FSE, Removal for 4GR-FSE).

NEXT -- Continue to next step.

7. REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID Engine Immobilizer System.

NEXT -- Continue to next step.

8. CHECK DTC OUTPUT

(a) Clear the DTCs Engine Immobilizer System.

(b) Recheck for DTCs Engine Immobilizer System.

OK:

DTC B2799 is not output.

NG -- REPLACE ID CODE BOX (IMMOBILIZER CODE ECU) Removal

OK -- END (ECM WAS DEFECTIVE)