Loading the Application OBSERVE ALL SAFETY PRECAUTIONS IN OPERATOR & SERVICE MANUALS. Once the application is loaded, the screen displays the DDEC III/IV menu. DDEC III/IV ----Selections---- ENGINE MENU Once you load the DDEC III/IV application, you have access to the following menu options: Engine Menu (Chapter 3) Marine Controls (Chapter 4) Series 638 (Chapter 5) Detroit Diesel Application User’s Manual 9