Engine Immobilizer System (w/ Smart Key System)

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM (w/ Smart Key System): B2799: Engine Immobiliser System Malfunction
B2799 - Engine Immobiliser System Malfunction

DESCRIPTION

When there are communication malfunctions between the ECM and certification ECU (smart key ECU assembly), or when the communication ID codes do not match, the ECM stores this DTC.





* *: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected





Related Data List and Active Test





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When replacing the certification ECU (smart key ECU assembly), refer to Registration Engine Immobilizer System (w/ Smart Key System).
* After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

HINT
When DTC B2799 and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ECM)

(a) Disconnect the A43 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the A25 ECM connector.

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

Standard Resistance:

for 2GR-FE





for 2AR-FE





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

2. REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID Engine Immobilizer System (w/ Smart Key System).

NEXT -- Continue to next step.

3. CLEAR DTC

(a) Clear the DTCs Engine Immobilizer System (w/ Smart Key System).

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Check for DTCs Engine Immobilizer System (w/ Smart Key System).

HINT
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

OK:

DTC B2799 is not output.

NG -- REPLACE ECM

OK -- END (ECU COMMUNICATION ID HAS NOT BEEN REGISTERED)

5. REPLACE ECM

(a) Temporarily replace the ECM with a new or known good one Removal for 2GR-FE, Removal for 2AR-FE).

NEXT -- Continue to next step.

6. CLEAR DTC

(a) Clear the DTCs Engine Immobilizer System (w/ Smart Key System).

NEXT -- Continue to next step.

7. CHECK DTC OUTPUT

(a) Check for DTCs Engine Immobilizer System (w/ Smart Key System).

HINT
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

OK:

DTC B2799 is not output.

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- END (ECM WAS DEFECTIVE)