Engine Immobiliser System (W/ Smart Key System)

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/ Smart Key System): B2799-539: Engine Immobiliser System Malfunction

DTC B2799-539 - Engine Immobiliser System Malfunction

DTC B2799-540 - Engine Immobiliser System Malfunction

DTC B2799-541 - Engine Immobiliser System Malfunction

DTC B2799-542 - Engine Immobiliser System Malfunction

DTC B2799-543 - Engine Immobiliser System Malfunction

DTC B2799-544 - Engine Immobiliser System Malfunction

DESCRIPTION

These DTCs are detected when: 1) the wire harness between the transponder key ECU and hybrid vehicle control ECU is open or shorted, 2) the ECU communication IDs of the hybrid vehicle control ECU and transponder key ECU are different, 3) the start ON (READY) signal is delayed, or 4) the key codes are unmatched.
Before troubleshooting for these DTCs, make sure no transponder key ECU DTCs are present. If present, troubleshoot the transponder key ECU DTCs or hybrid vehicle control ECU DTCs first.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC
(a) Delete the DTC Engine Immobiliser System (w/ Smart Key System).
(b) Check that no DTC is output.
OK:
DTC is not output.
OK -- END
NG -- Continue to next step.






2. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - HYBRID VEHICLE CONTROL ECU)




(a) Disconnect the T5 and H14 ECU connectors.
(b) Measure the resistance of the wire harness side connectors.
Standard resistance:






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






3. CHECK TRANSPONDER KEY ECU (OPERATION)
(a) Temporarily replace the transponder key ECU with a new or normally functioning one.
(b) Check that the power switch can be turned ON (ACC and IG) and the hybrid control system can be started.
OK:
Power switch can be turned ON (ACC and IG) and hybrid control system can be started.
NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- END (TRANSPONDER KEY ECU IS DEFECTIVE)