Detroit Diesel DD15 EuroIV Operator's Manual page 42

Detroit Diesel Electronic Controls (DDEC) System
NOTE: The Stop Engine Override Switch and the Diagnostic Request
Switch are the same.
NOTE: Holding down the Stop Engine Override Switch will not prevent the
engine shutdown sequence. You must continue to reset the automatic
shutdown system by pressing the Stop Engine Override Switch at intervals
of approximately 15 to 20 seconds.
It takes 30 seconds from the time the automatic shutdown sequence begins until
engine shutdown. Therefore, the operator must press the override switch just prior
to engine shutdown and continue to do so until the vehicle can be brought to a stop
in a safe location.
Immediate Speed Reduction
The immediate speed reduction option will bring engine rpm back to a
predetermined speed, but will not shut down the engine.
The engine should not be restarted after it has been shut down by the engine
protection system, unless the problem has been located and corrected.
Red Stop Lamp
The conditions that will cause the RSL (Stop Engine) to come on are:
• High coolant temperature
• Loss of coolant
• High oil temperature
• Low oil pressure
• Auxiliary shutdown
If the malfunction is intermittent, the lights will come on and go off as the
computer senses the changing engine condition.
Diagnostic Tool
The diagnostic tool for Detroit Diesel Electronic Control is the Detroit Diesel
Diagnostic Link (DDDL 7.X). DDDL 7.X requirements are listed earlier in the
manual under Data Recording Capability.
The temperature of air in the intake system is increased with the addition of EGR.
DDEC is programmed to reduce fueling (power) for a short time to reduce air and
coolant temperatures when necessary.
DDEC will store an information code that this event occurred, but no corrective
action is required as this action is designed to maintain operation without a
noticeable affect on vehicle performance.
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Copyright © 2014 DETROIT DIESEL CORPORATION DDC-SVC-MAN-0175
All information subject to change without notice.