IDENTIFICATION
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.
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
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.
24
All information subject to change without notice.
(Rev. )
DDC-SVC-MAN-0055
Copyright © 2009 DETROIT DIESEL CORPORATION
Содержание EPA04 MBE 900
Страница 2: ......