NOVELTY - The system has an intercooler fault diagnostics discrimination section which compares rear end temperatures of an air compressor and an intercooler, and determines the malfunction in the cooling function of intercooler. A first temperature sensor is positioned in a front end of air compressor. A second temperature sensor is provided for measuring rear end temperature of the intercooler. A calculation unit is provided for calculating the rear end temperature of the air compressor based on the second pressure sensor positioned in the rear end of the air compressor.    USE - Intercooler malfunction control system of air compressor for cooling of fuel cell mounted in fuel cell vehicle.    ADVANTAGE - The intercooler cooling function is corrected by comparing the rear end temperatures of the air compressor and the intercooler. The bypass amount control of air and open control of the pressure control valve are performed based on the ambient temperature of the air electrode inlet end, if determined that the intercooler cooling function breaks down. Hence, the back pressure generated in the pipe of the air electrode is effectively controlled, the fuel cell high power operation is maintained in the intercooler failure event for the preset time and the driving of the fuel cell vehicle is smoothly made for the preset time.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an intercooler malfunction control method of air compressor for cooling of fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart illustrating the intercooler malfunction control process of air compressor for cooling of fuel cell. (Drawing includes non-English language text)    Step for determining whether temperature of sensed stack is greater than steady state temperature (S102)    Step for determining whether inlet end temperature of air electrode is greater than reference temperature (S103)    Step for making control opening of pressure control valve mounted on outlet of air electrode (S104)    Step for lowering back pressure within air electrode through by-pass of air (S106)