Automobile engine anti-theft logic(China car lock): when the ignition switch is turned on, the key transponder forms the first information intersection with the anti-theft controller. The key and chip will meet each other with different identification codes.(China car lock) The anti-theft controller will not continue to communicate with ECU. The circuits of ignition system and fuel injection system remain open circuit, and the engine cannot be started. If the signals match, the anti-theft controller receives the verification request sent by the ECU, adds a 128 bit password according to the set 32-bit random code and the calculated 128 bit password, and the ECU will interact with the anti-theft controller. After the password is the same, the ECU anti-theft is released and can be started normally.(China car lock)