MBE 900 OPERATOR'S GUIDE Below 900 rpm, the engine brake is always turned off to prevent the engine from stalling. Also, the engine brake is automatically turned off when the accelerator pedal is pressed. Link® (DDDL) PC-based software or minidiag2. The engine control system monitors both the engine and the datalink. When a malfunction or other problem is detected, the system selects an appropriate response; for example, the emergency running mode may be activated. NOTE: When in emergency running mode (constant rpm), the engine brake can be activated only when the engine is in overrun. When constant rpm has been attained, the engine brake is automatically turned off.
Electronic Engine Control System The engine is equipped with a fully electronic control system. Besides the engine and its related sensors, this system is composed of the following: The DDEC-ECU (engine control unit) The DDEC-VCU (vehicle control unit) located under the right-hand dash panel The two control units are connected by a proprietary datalink through which all necessary data and information can be exchanged. See Figure 16. The DDEC-VCU then broadcasts all information on the J1587 and J1939 datalinks, where it can be read by the Nexiq™Diagnostic Data Reader (DDR), Detroit Diesel Diagnostic All information subject to change without notice. (Rev.
04/08) 25 DDC-SVC-MAN-0055 04/08 Copyright © 2008 DETROIT DIESEL CORPORATION