Controller of electromagnetic valve driving circuit and abnormality diagnosing method for electromagnetic valve driving circuit

A controller of an electromagnetic valve driving circuit including a switching element connected to a solenoid of an electromagnetic valve, a cutoff circuit capable of cutting off a connection between a power supply and the switching element, and current sensor for detecting a solenoid current flowing in the solenoid, the controller comprising:

• abnormality diagnosing means for outputting a cutoff command for cutting off the connection between the power supply and the switching element to the cutoff circuit and outputting a switching command for causing the switching element to perform a switching operation to the switching element when a predetermined diagnosis condition is satisfied, and determining that the cutoff circuit normally operates when the detected solenoid current is less than a threshold value and determining that the cutoff circuit does not normally operate when the detected solenoid current is greater than or equal to the threshold value while outputting the cutoff command and the switching command.