DDEC TROUBLESHOOTING
7.1
DDEC ECM SOFTWARE FEATURES
This section is a brief description of DDEC system ECM software features and what is required to
activate the feature (DDR, PC, etc.).
NOTE:
For a complete description of features, refer to publication 7SA800, DDEC III Application
and Installation manual.
7.1.1
Air Compressor Governor System
The air compressor governor system can be set on the mainframe only. This system is similar
to the pressure governor system, but for air compressor applications. 6N4C change adjusts the
engine speed to compensate for air pressure loads. ECM Software 4.01 is required.
7.1.2
Cruise Control
Cruise control can be set with the DDR or programming station.
Auto Resume
Yes or No. Will re-engage cruise if clutch switch is used to disable. Second press of
clutch must be done within 3 seconds of the disengage and cruise will resume at
the previously set speed.
Minimum Cruise Speed
Can be set with the DDR or programming station. Normally 20 mph, newer ECM
software may allow setting to as low as 10 mph.
Maximum Cruise Speed
Can be set with the DDR or programming station. Limited to the calculated gear
bound vehicle speed at rated engine r/min, or if progressive shift = yes, then max
cruise speed is limited to high gear r/min. Also limited to vehicle speed limit (if set).
Engine Brake Cruise
Can be set with the DDR or programming station. Refer to engine brake information.
Refer to section 7.1.5.
7.1.3
Cruise Switch Variable Speed Governor
The cruise switch can be set with the DDR or programming station. Requires Vehicle Speed
Sensor (VSS) set to Yes.
Initial r/min= 1000 r/min default, initial r/min to ramp up to when set.
R/min incr= 25 r/min default, r/min increase when res/accl switch is enabled.
7.1.4
Data Pages
Enable data pages on the mainframe (up to 7.00 ECM software). This is automatic with ECM
software level 20.xx or higher.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
7-3
