B2799-542

ENGINE IMMOBILIZER SYSTEM: B2799-542: Engine Immobilizer System Malfunction

DTC B2799-542 - Engine Immobilizer System Malfunction

DTC B2799-790 - Engine Immobilizer System Malfunction

DESCRIPTION

These DTCs are output when the hybrid vehicle control ECU detects errors in communication between the transponder key ECU and the hybrid vehicle control ECU, and in the communication lines. These DTCs are also output when a hybrid control system start is attempted while the ECU communication ID between the transponder key ECU and the hybrid vehicle control ECU are different. Before troubleshooting for DTCs, make sure that there is no DTC detected in the transponder key ECU. If there is key code related DTC detected in the transponder key ECU, repair it first.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the T9 ECU and H29 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.
2. RE-REGISTRATION ECU COMMUNICATION ID (TRANSPONDER KEY ECU ASSEMBLY - HYBRID VEHICLE CONTROL ECU)
(a) Re-register the ECU communication ID Engine Immobilizer System.
(b) Check that the hybrid control system starts.
OK:
Hybrid control system starts.
OK -- NO PROBLEM
NG -- Continue to next step.
3. CHECK OPERATION OF TRANSPONDER KEY ECU ASSEMBLY
(a) After replacing the transponder key ECU assembly with a normally functioning transponder key ECU assembly, check that the hybrid control system starts.
OK:
Hybrid control system starts.
NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- END (TRANSPONDER KEY ECU ASSEMBLY DEFECTIVE)