B2799

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2799: Engine Immobiliser System Malfunction
B2799 - Engine Immobiliser System Malfunction

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
When the transponder key ECU and/or ECM is replaced, reregister the ECU - ECM communication ID Engine Immobiliser System.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Check for DTC Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B2799 is not output.

NG -- REREGISTER ECU - ECM COMMUNICATION ID

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

3. REREGISTER ECU - ECM COMMUNICATION ID

(a) Reregister the ECU - ECM communication ID Engine Immobiliser System.

NEXT -- Continue to next step.

4. CLEAR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

5. CHECK FOR DTC

(a) Check for DTC Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B2799 is not output.

NG -- CHECK CONNECTION OF CONNECTOR

OK -- END

6. CHECK CONNECTION OF CONNECTOR

(a) Turn the ignition switch LOCK.

(b) Check that the connectors are properly connected to the ECM and the transponder key ECU.

OK:

Connectors are properly connected.

NG -- CONNECT CONNECTOR CORRECTLY
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)





(a) Disconnect the J26 ECU connector.

(b) Disconnect the A24 ECM connector.

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

Standard resistance:





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

8. REPLACE TRANSPONDER KEY ECU

(a) Temporarily replace the transponder key ECU with a new Removal.

NEXT -- Continue to next step.

9. CLEAR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

10. CHECK FOR DTC

(a) Check for DTC Reading and Clearing Diagnostic Trouble Codes.

Result





D -- REPLACE ECM Removal

C -- REPLACE ECM Removal

B -- REPLACE ECM Removal

A -- END (TRANSPONDER KEY ECU IS DEFECTIVE)