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.
Best Answer: The ECU or Electronic Control Unit is a small computer that runs the car's fuel, ignition and emission systems. Your mechanic can check it's functionality with the proper diagnostic equipment and experience. There can be many different symptoms that can arise from a ECU that has failed.