B2799-790

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2799-542,B2799-790: Engine Immobiliser System Malfunction

DTC B2799-542 - Engine Immobiliser System Malfunction

DTC B2799-790 - Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is output when one of the following occurs: 1) the hybrid vehicle control ECU detects errors in its own communications with the ID code box; 2) the hybrid vehicle control ECU detects errors in the communication lines; or 3) the ECU communication ID between the ID code box and hybrid vehicle control ECU is different and an hybrid control system start is attempted. Before troubleshooting for this DTC, make sure no certification ECU DTCs are present. If present, troubleshoot the certification ECU DTCs first.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- If the ID code box is replaced, register the key and ECU communication ID Programming and Relearning.
- If the hybrid vehicle control ECU is replaced, register the ECU communication ID Programming and Relearning.

PROCEDURE

1. CHECK DTC OUTPUT
(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- USE SIMULATION METHOD TO CHECK
A -- Continue to next step.
2. RE-REGISTER ECU COMMUNICATION ID
(a) Re-register the ECU communication ID Programming and Relearning between the ID code box and hybrid vehicle control ECU.
NEXT -- Continue to next step.
3. CHECK DTC OUTPUT
(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- END
A -- Continue to next step.
4. 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.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. REPLACE HYBRID VEHICLE CONTROL ECU
(a) Replace the hybrid vehicle control ECU Removal.
NEXT -- Continue to next step.
6. REGISTER ECU COMMUNICATION ID
(a) Register the ECU communication ID between the ID code box and hybrid vehicle control ECU Programming and Relearning.
NEXT -- Continue to next step.
7. CHECK DTC OUTPUT
(a) Delete the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- END
A -- REPLACE ID CODE BOX