B2799

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

DESCRIPTION

This DTC is stored when one of the following occurs: 1) the power management control ECU (HV CPU) detects an error in its own communication with the certification ECU assembly (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2; 2) the power management control ECU (HV CPU) detects an error in the communication lines; or 3) the ECU communication ID between the certification ECU assembly (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2 and power management control ECU (HV CPU) is different and a hybrid vehicle control system start is attempted.

* *1: except Canada

* *2: for Canada

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.

* *1: except Canada

* *2: for Canada

WIRING DIAGRAM

1. except Canada

2. for Canada

INSPECTION PROCEDURE

NOTICE:
* If the certification ECU (smart key ECU assembly) is replaced, register all the keys and ECU communication ID Engine Immobilizer System.*1
* If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID Engine Immobilizer System.*2
* *1: except Canada
* *2: for Canada

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 CONNECTOR CONNECTION CONDITION

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

4. CHECK CONNECTOR CONNECTION CONDITION

(a) Turn the power switch off.

(b) Check that the connectors are properly connected to the power management control ECU (HV CPU) and certification ECU (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2.

* *1: except Canada

* *2: for Canada

OK:

Connectors are properly connected.

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

5. SYSTEM CHECK

(a) Check the vehicle specification.

Result:

B -- CHECK HARNESS AND CONNECTOR (ID CODE BOX - POWER MANAGEMENT CONTROL ECU (HV CPU))
A -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU (HV CPU))

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

(b) Disconnect the power management control ECU (HV CPU) connector.

Standard Voltage:

Text in Illustration

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

7. REPLACE POWER MANAGEMENT CONTROL ECU (HV CPU)

(a) Replace the power management control ECU (HV CPU) Removal.

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 CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- END (POWER MANAGEMENT CONTROL ECU (HV CPU) WAS DEFECTIVE)

9. CHECK HARNESS AND CONNECTOR (ID CODE BOX - POWER MANAGEMENT CONTROL ECU (HV CPU))

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

(b) Disconnect the power management control ECU (HV CPU) connector.

Standard Voltage:

Text in Illustration

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

10. REPLACE POWER MANAGEMENT CONTROL ECU (HV CPU)

(a) Replace the power management control ECU (HV CPU) Removal.

NEXT -- Continue to next step.

11. 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 (IMMOBILISER CODE ECU) Removal

OK -- END (POWER MANAGEMENT CONTROL ECU (HV CPU) WAS DEFECTIVE)