An engine control unit (ECU), now called the powertrain control module (PCM), is a type of electronic control unit that controls a series of actuators on an inter- nal combustion engine to ensure optimal engine performance. It does this by reading values from a multitude of sensors within the engine bay, interpreting the data using multidimensional performance maps (called lookup tables), and adjusting the engine actuators accordingly.

 An engine control unit (ECU), now called the powertrain control module (PCM), is a type of electronic control unit that controls a series of actuators on an inter- nal combustion engine to ensure optimal engine performance. It does this by reading values from a multitude of sensors within the engine bay, interpreting the data using multidimensional performance maps (called lookup tables), and adjusting the engine actuators accordingly.

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