Practice question

What is the primary function of the Engine Control Unit (ECU) in a modern Engine Management System?

  1. To mechanically regulate the passenger cabin heating and air conditioning valves
  2. To process input data from sensors and adjust actuators (fuel injectors, spark timing) to optimize combustion
  3. To step up battery voltage directly to the starter motor during cold engine cranks
  4. To control the planetary gear ratios in manual transmission vehicles

Answer: B — To process input data from sensors and adjust actuators (fuel injectors, spark timing) to optimize combustion

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