It’s so vital to the operation of your Picanto that it won’t run without one. It uses the data from the oxygen sensors, camshaft sensor(s), mass airflow sensor, knock sensors, and much much more to make constant adjustments to the engine. The ECM takes all of the data from the various sensors, and uses it to operate the engine in a way that is significantly more efficient than traditionally controlled engines. Almost all of the essential functions of the vehicle are controlled by the ECU/ECM.
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