B2799

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: B2799: Engine Immobiliser System Malfunction
B2799 - Engine Immobiliser System Malfunction

DESCRIPTION

When there are communication malfunctions between the power management control ECU and certification ECU (smart key ECU assembly), or when the communication ID codes do not match, the power management control ECU 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.
* 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) - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the I87 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the I4 power management control ECU 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.

2. REGISTER ECU COMMUNICATION ID

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

NEXT -- Continue to next step.

3. CLEAR DTC

(a) Clear the DTCs Engine Immobilizer System.

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Check for DTCs Engine Immobilizer System.

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

OK:

DTC B2799 is not output.

NG -- REPLACE POWER MANAGEMENT CONTROL ECU

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

5. REPLACE POWER MANAGEMENT CONTROL ECU

(a) Temporarily replace the power management control ECU with a new or known good one Removal.

NEXT -- Continue to next step.

6. CLEAR DTC

(a) Clear the DTCs Engine Immobilizer System.

NEXT -- Continue to next step.

7. CHECK DTC OUTPUT

(a) Check for DTCs Engine Immobilizer 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 (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE)