See How Fuel Injection Systems Work for a lot more detail on what the ECU does. During the course you will gain a sound understanding of automotive electronic PCBs diagnostic techniques and principles that you can apply. Disabling of secondary O2 sensors (CAT removal). The ECU does all of this to ensure the lowest emissions and best mileage. From Business: HI-TECH ELECTRO ECM company Repairs, Rebuilds and Remanufactures All Type of Computer for Electronic Engine Control Modules (ECM), Engine Control Units (ECU) . Disabling of catalytic converter monitoring processes (and related DTCs). With this data, it performs millions of calculations each second, including looking up values in tables, calculating the results of long equations to decide on the best spark timing and determining how long the fuel injector is open. Gathering data from dozens of different sensors, the ECU knows everything from the coolant temperature to the amount of oxygen in the exhaust. The ECU uses closed-loop control, a control scheme that monitors outputs of a system to control the inputs to a system, managing the emissions and fuel economy of the engine (as well as a host of other parameters). (See How Catalytic Converters Work for more details.)Ĭontrolling the engine is the most processor-intensive job on your car, and the engine control unit (ECU) is the most powerful computer on most cars. With the enactment of increasingly stricter emissions laws, sophisticated control schemes were needed to regulate the air/fuel mixture so that the catalytic converter could remove a lot of the pollution from the exhaust. Before emissions laws were enacted, it was possible to build a car engine without microprocessors.
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