Sulfur dioxide (SO2) is irritating to eyes, skin and respiratory system. Volcanic Smog (vog) is produced from SO2 gas and is a hazard in Hawaii. Scientists monitor SO2 emission rates at KÄ«lauea volcano. Gas Plume during the 1984 eruption of Mauna Loa, Hawaii blocks out the sun.
Control Unit (CU) A control unit (CU) handles all processor control signals. It directs all input and output flow, fetches code for instructions from microprograms and directs other units and models by providing control and timing signals.
Electronic Control Unit (ECU) The computer or brains of the EFI system. This is where the fuel maps exist and all fuel calculations are made. The fuel map provides the ECU with the information to adjust the air/fuel ration of the engine. All OEM ECUs are able to control both the fuel injection and ignition systems.