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== DDEC I Schematics ==
== DDEC I Schematics ==
[[File:DDEC I Schematic Diagram.png|thumb|DDEC I Schematic Diagram|alt=|600x600px]]DDEC I controls the timing and amount of fuel injected into each cylinder. The system also monitors several engine functions using various sensors that send electrical signals to the main Electronic Control Module (ECM). The ECM uses this information to send a command pulse to the Electronic Distributor Unit (EDU). The EDU functions as the high current switching unit for actuation of the Electronic Unit Injector (EUI) solenoids. 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.
[[File:DDEC I Schematic Diagram.png|thumb|DDEC I Schematic Diagram|alt=|600x600px]]This system utilizes an engine mounted EDU and a cab mounted ECM, which has a replaceable Programmable Read-Only Memory (PROM). The EDU functions as the high current switching unit for the actuation of the injector solenoids and is fuel-cooled.
The DDEC I ECM is a microprocessor. It is the control center of the DDEC I system.
The DDEC I ECM is packaged in a die-cast aluminum housing with sealed connectors.
The DDEC I system consists of the following:
* The DDEC I ECM
* A replaceable PROM
* Connections to various engine sensors, operational displays, power and fuel injectors
DDEC I controls the timing and amount of fuel injected into each cylinder. The system also monitors several engine functions using various sensors that send electrical signals to the main Electronic Control Module (ECM). The ECM uses this information to send a command pulse to the Electronic Distributor Unit (EDU). The EDU functions as the high current switching unit for actuation of the Electronic Unit Injector (EUI) solenoids. 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.
== Owner Notes ==
== Owner Notes ==