The Mechanically actuated Electronically controlled Unit Injectors (MEUI), formerly known as Electronic Unit Injectors (EUI), also use the engine camshaft and push rods to generate fuel injection pressure, but use an Electronic Control Module (ECM) to control the amount of fuel injected into the cylinders. A solenoid on each injector receives voltage signals from the ECM to become energized. The injectors will inject fuel only while the injector solenoid is energized.
The ECM controls the amount of fuel that is injected by varying the signals that are sent to the injectors.
By controlling the timing and the duration of the voltage signal, the ECM can control injection timing and the amount of fuel that is injected.
