Most ECU’s have a main memory storage system that is comprised of a nonvolatile Electrically Erasable Programmable Read-Only Memory device called an EEPROM. ![]() All of these output responses from the ECU have to be predefined in ECU’s internal memory. In general terms, the ECU is primarily responsible for monitoring and managing the engine's performance via a number of sensors and then calculating the proper signal to send external devices to control the operation of the engine. Most modern engines are equipped with a microprocessor-based computer referred to as the Engine Control Unit or Electronic Control Unit which is abbreviated to ECU.
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