The Detroit Diesel Electronic Control (DDEC) system is a microprocessor-controlled electronic unit injection-engine governing system. It was first introduced in 1985 and has since gone through several generations of development. The DDEC system is used to control and monitor all aspects of engine operation, including fuel injection, timing, air intake, and emissions.

The major components of the DDEC system consist of the electronic control module (ECM),
the electronic unit injectors (EUI) and the various system sensors. The purpose of the sensors is
to provide information to the ECM regarding various engine performance characteristics. The
information sent to the ECM is used to instantaneously regulate engine and vehicle performance.

The DDEC system consists of three main components:

  • Electronic control module (ECM): The ECM is the brain of the DDEC system. It collects data from various sensors throughout the engine and uses this data to calculate the optimal fuel injection timing and quantity. The ECM also controls other aspects of engine operation, such as idle speed and turbocharger boost.
  • Electronic unit injectors (EUIs): The EUIs are responsible for injecting fuel into the engine’s cylinders. They are controlled by the ECM and can adjust the timing and quantity of fuel injected with great precision.
  • Sensors: The DDEC system uses a variety of sensors to monitor engine conditions. These sensors include the engine speed sensor, coolant temperature sensor, intake air temperature sensor, and boost pressure sensor. The data from these sensors is used by the ECM to calculate the optimal fuel injection timing and quantity.

The DDEC system works by continuously monitoring engine conditions and adjusting the fuel injection timing and quantity accordingly. This ensures that the engine is always operating at its peak efficiency and performance. The DDEC system also helps to reduce emissions by ensuring that the engine is always burning the correct amount of fuel.

ECMs are capable of firing a maximum of eight injectors. For 12, 16 or 20 cylinder engines, two
or three ECMs are used per engine. The Master ECM monitors most all engine performance
areas, while the Receiver 1 and Receiver 2 ECMs are used to fire the additional injectors.

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