Abstract: Embedded system began in the 20 th century,W ith the development of embedded systems, embedded systems gradually rep lace the simp le single2chip system,which has become a trend, and in various fields has been growing a wide range of app lications, especially in the automotive sector. Automobile in a modern society is one im2 portantmeans of transport. For the operation ofmotor vehicle quality and safety requirements, and the current failure to monitor China’s automotive technology and electronic technology in the faultmonitoring system to monitor the ap2 p lication, it combined with the current automotive fault detection, monitoring the status of systems development is p roposed based onW inCE car faultmonitoring system. The system consists of data acquisition module, the data show that alarm module and data querymodule are composed of three functionalmodules. If the system detects abnormal car, then p re2alarm to remind the driver to take effective measures starts,which limit the possibility of accidents to a minimum.