Circuit and method for detecting failures in data acquisition of overall controller of automobile

The invention discloses a circuit for detecting failures in data acquisition of an overall controller of an automobile. According to the invention, two input signals and three states of failure open circuit are converted to a level combination of two points A and B through an acquisition interface circuit, MC reads out the tree states through judge the levels of the points A and B, and then the reading result is transmitted to an upper computer. By the adoption of the circuit, the external failures can be detected intelligently. The circuit can be used for detecting the failures of external circuits of the overall controller of the automobile accurately and has the function of short circuit protection. Therefore, workers can discover the problems of the external circuits in time.