DTC 540

DTC B2799/540 ENGINE IMMOBILISER SYSTEM MALFUNCTION

CIRCUIT DESCRIPTION

DTC Detection Condition:

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

Wiring Diagram:

Step 1 - 2:

INSPECTION PROCEDURE