Fault diagnosis device of automobile electromagnetic valve

The utility model discloses a fault diagnosis device of an automobile electromagnetic valve. The device comprises a controller, an internal short-circuit fault detection circuit, a broken circuit and a power supply short circuit fault detection circuit, an over-the-ground short circuit fault detection circuit, a power supply module, a first sampling module, an electromagnetic valve for a vehicle, a first control switch M1 and a second sampling module; the faults capable of being detected and diagnosed comprise an over-the-ground short circuit fault, a broken circuit fault, a power supply short circuit and internal short circuit fault, an electromagnetic valve reliability fault and the like; and the electromagnetic valve fault is mainly determined through a hardware circuit with reasonable design and software with accurate development. The diagnosis method provided by the utility model is completed before the starting and in the starting of an electronic fuel injection engine, and whether the electromagnet valve has faults is determined, and corresponding protection measures are adopted, thus the engine and the electronic control system thereof are protected; the hardware circuit is simple and effective, and the cost can be lowered; the expense of the software is less, the reliability of the electronic fuel injection system is increased; and a favorable effect can be reached in the practical engineering application.