Patent ID: 8730006

Claim:
An engine control unit, which supports an antitheft system outputting, when a key ID registered in a portable device carried by a user of a moving object matches an authentication-purpose key ID registered in a receiver provided in the moving object, a receiver status signal that contains information indicating that the portable device has been authenticated, the engine control unit comprising: starting control means for controlling a starting operation of an engine in response to a start permission signal; storage means for registering an authentication-purpose receiver ID for authenticating the receiver when an antitheft function is installed to the moving object; and antitheft function install/non-install judging means for judging whether or not the antitheft function is installed to the moving object, wherein, when the authentication-purpose receiver ID is not registered in the storage means and the receiver status signal is not entered, the antitheft function install/non-install judging means judges that the antitheft function is not installed, wherein, when the antitheft function install/non-install judging means judges that the antitheft function is not installed, the antitheft function install/non-install judging means outputs the start permission signal to the starting control means, wherein, when the authentication-purpose receiver ID is registered in the storage means or the receiver status signal is entered, the antitheft function install/non-install judging means judges that the antitheft function is installed, and wherein, when the antitheft function install/non-install judging means judges that the antitheft function is installed, the antitheft function install/non-install judging means does not output the start permission signal to the starting control means, and the engine control unit further comprising a registering communication means for registering the authentication-purpose receiver ID in the storage means, wherein, when the authentication-purpose receiver ID is not registered in the storage means and the receiver status signal is entered, the registering communication means confirms that a system ID registered in the receiver and a system ID registered in the storage means each registered as a commonly used ID in the antitheft system match each other, and then registers a receiver ID registered in the receiver as the authentication-purpose receiver ID.