MBE 4000 SERVICE MANUAL DDEC-ECU Engine-Resident Control Unit The DDEC-ECU control unit is located on the left-hand side of the engine. See Figure 1. The DDEC-ECU processes the data received from the DDEC-VCU, for example the position of the accelerator pedal, engine brake, etc. These data are evaluated together with the data from the sensors on the engine, such as, charge and oil pressure and coolant and fuel temperature. The data is then compared to the characteristic maps or lines stored in the DDEC-ECU. From these data, quantity and timing of injection are calculated and the unit pumps are actuated accordingly through the solenoid valves. Figure 1 DDEC-ECU Control Unit Location NOTE:
To obtain a replacement DDEC-ECU, all the data given on the DDEC-ECU label are required. All information subject to change without notice. 6SE412 0403 Copyright © 2004 DETROIT DIESEL CORPORATION 5