A heat exchange system including a heat exchanger having a housing and a cooling core disposed within in the housing. The pitch P2 of the output terminals 11c is different from the pitch P1 of the terminals 9 taking into account deformation of the substrate 6a or the wiring board 11 during bonding. The temperature of the first injector is estimated based on the temperature of the engine’s cooling water and the temperature of the fuel in the fuel passage from the fuel tank to the first injector, and the quantity of vapor generated in the fuel passage is determined according to the estimated temperature and the fuel pressure in the fuel passage. Thus, the method can receive comment about the specific component of the computerized system in the commentary input area.