Predicting of starting of an engine is performed in advance before starting of the engine. When the starting of the engine is predicted, a failure diagnosis of a device such as a heater, a pump and so forth, which are attached to the engine and to be operated before starting of the engine, is made. When the heater and the pump are determined to be normal from the result of the diagnosis, the heater and the pump are operated before the engine is started. With this, the temperature of the heater can be increased and the pressure of a fluid carried by the pump can be increased before starting the starting of the engine.