stereochemistry (stÄr'Ä-Å-kÄm'Ä­-strÄ) The branch of chemistry that deals with the spatial arrangements of atoms in molecules and with the chemical and physical effects of these arrangements.
ECU. Short for Electronic Control Unit, the ECU is a name given to a device that controls one or more electrical systems in a vehicle. It operates much like the BIOS does in a computer.
What does the ECU do? Really, you can think of the engine control unit as one part of your carâs brain (itâs responsible for controlling the engine). Technically, the engine control module is an electrical control unit, but so is the TCU and a number of other controllers aboard your car. Your ECU is responsible for monitoring all aspects of engine operation, making adjustments based on driver input, and more.