B2799

ENGINE IMMOBILISER: 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 hybrid vehicle control ECU detects an error in its own communication with the ID code box; 2) the hybrid vehicle control ECU detects an error in the communication lines; or 3) the ECU communication ID between the ID code box and hybrid vehicle control ECU is different when an engine start is attempted.

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT

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

(b) Recheck for DTCs.

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 Programming and Relearning.

NEXT -- Continue to next step.

3. CHECK DTC OUTPUT

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

(b) Recheck for DTCs.

OK:

DTC B2799 is not output.

NG -- CHECK CONNECTOR CONNECTION CONDITION

OK -- END (ECU COMMUNICATION ID WAS INCORRECT)

4. CHECK CONNECTOR CONNECTION CONDITION

(a) Turn the power switch off.

(b) Check that the connectors are properly connected to the hybrid vehicle control ECU and ID code box.

OK:

Connectors are properly connected.

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

5. CHECK HARNESS AND CONNECTOR (ID CODE BOX - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the E50 ID code box and A61 hybrid vehicle control ECU connectors.





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

Resistance:





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

6. REPLACE HYBRID VEHICLE CONTROL ECU

(a) Replace the hybrid vehicle control ECU Removal.

NEXT -- Continue to next step.

7. REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID Programming and Relearning.

NEXT -- Continue to next step.

8. CHECK DTC OUTPUT

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

(b) Recheck for DTCs.

OK:

DTC B2799 is not output.

NG -- REPLACE ID CODE BOX Removal

OK -- END (HYBRID VEHICLE CONTROL ECU WAS DEFECTIVE)