OTHER FEATURES
functions which make injector timing much
simpler and more precise.
DDEC provides the capability of quickly
diagnosing system malfunctions with a self-
diagnostic system. The self-diagnostic system
monitors all engine sensors and electronic
components and recognizes system faults and
other engine-related problems by providing the
technician with a diagnostic code. The DDEC
system will illuminate the dashboard CHECK
ENGINE and STOP ENGINE indicators which
are integral parts of the electronic diagnostic
system. These lights are designed to indicate a
problem and transmit a coded signal to the
technician to locate the defective component.
To facilitate troubleshooting and obtain pertinent
data logged in the ECM (Electronic Control
Module) memory, a Diagnostic Data Reader
(DDR) can be used (not supplied by
manufacturer). Plug the DDR into the receptacle
on the upper left wall in the driver's footwell. You
can also momentarily depress the STOP
ENGINE OVERRIDE switch on the left hand
lower control panel (refer to Controls &
Instruments chapter). Active and inactive codes
will flash respectively the STOP ENGINE and the
CHECK ENGINE indicators. Refer to Technical
Information chapter under "DDEC IV Diagnostic
Codes".
DEC IV ELECTRONIC CONTROL
MODULE (ECM)
The simplest implementation of Data Hub does
not require the addition of any hardware to the
vehicle. Instead, basic Data Hub features built
into the DDEC IV ECM are used. The ECM
stores data such as miles, fuel used, idle time,
PTO time, idle fuel, cruise time and cruise fuel
on life-to-date, trip and daily basis. Daily
recording is limited to a maximum of two days.
Selected parameters, such as oil pressure, are
measured periodically under specified
conditions. The measurements are analyzed
over long time periods, which allows the system
to detect degradation in performance and warn
the user prior to component failure.
The average life span of up to ten components
may be specified in terms of miles, fuel used,
time, engine rpm and engine hours. The ECM
tracks the specified factors and automatically
alerts the user when the average component life
span has been attained. An event log is also
stored which indicates the vehicle status (e.g.,
off, idle, in motion) at 15 minute intervals.
Data stored in the DDEC IV ECM is extracted by
connecting a cable from a personal computer
(PC) to the vehicle's diagnostic connector via an
RP1202 adapter module. Data extraction takes
about 20 seconds.
MESSAGE CENTER DISPLAY (MCD)
MCD is a standard dashboard mounted graphic
device that displays and records operational data
transmitted by the Detroit Diesel Electronic
Controls (DDEC) and other electronically
controlled components on the SAE J1708/1587
diagnostic data link.
The many functions of the MCD include vehicle
operating status for the driver and diagnostics for
the technician.
The MCD uses a dashboard integrated liquid
crystal display. It provides automated intensity
control of the display, based on the dashboard
instrument panel lights for improved driver
convenience.
Should an alert message be sent out by the
ECM, the driver will be shown what is wrong via
an error code. Symbols may be displayed on the
screen when a condition occurs or as a reminder
that a feature is enabled. These symbols
include a bell when the reminder alarm is on,
“PTO” when fast idle is activated or “CC” when
cruise control is activated.
Note: When a condition requiring attention
occurs, the screen relating to that condition will
automatically replace the current display.
The MCD works with interactive menus in a
series of cascading layers. The MCD allows
access only to GAUGE MODE, FUEL
ECONOMY and CLOCK/DIST menus when the
vehicle is moving. Access to the remaining
menus is granted when the vehicle is stopped.
The driver inputs commands and settings by
using the keys on the MCD keypad.
06399
Use the up (↑) and down(↓) arrows to highlight a
function or a setting. At any given level, small
arrows may appear in the upper and lower right
corner of the display. This means that more
information is available by scrolling up or down
with the arrow keys.
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