ECU electronic control unit of Can line, also known as "trip computer" and "vehicle computer". Like ordinary computers, it is composed of microcontroller, memory, input/output interface, analog-to-digital converter and large-scale integrated circuits such as shaping and driving. According to the brief introduction of inquiring about automobile wiring, it is known that the water temperature sensor line of diesel engine is a can line inside ecu. Can line is responsible for inductive output.