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An electronic control unit (ECU) or electronic control module (ECM) controls a series of actuators in the diesel engine to ensure optimal engine performance through electronic control. Modern diesel engines have a number of sensors within the engine and machine which provide readings to the ECU. The ECU adjusts the actuators to deliver the correct performance such as fuel/air mix, idle speed, pressures, wastegate control and other functions. Perkins defines the ECU programming for each engine to meet the application and engine demands. Contact your local Perkins distributor for assistance in ECU programming and application advice.