DDEC II also controls the timing and amount of fuel injected into each cylinder. The system also monitors several engine sensors that send electrical signals to the main ECM. See Figure 4. Unlike DDEC I, the DDEC II ECM uses this information to actuate the EUI solenoids. DDEC II incorporates all of the control electronics into one engine mounted ECM instead of the ECM and EDU that are required in DDEC I. The ECM also has the ability to limit or shut down the engine completely (depending on option selection) in the case of damaging engine conditions, such as low oil pressure, low coolant level, or high oil temperature.
