Detroit Diesel 60 Series Owner's Manual page 5

DDEC III/IV ENGINE
PROTECTION
Since many vehicles are equipped with the
DDEC engine protection system, the "Stop
Engine" malfunction is recorded in the
Electronic Control Module. With the 30
second shutdown option, the engine will
begin a 30 second stepped power down
sequence until it shuts down completely.
To allow for the possibility of the "Stop
Engine" automatic shutdown function being
activated while the vehicle is operating in a
critical situation, an override is provided.
In such a situation the operator may elect
to "override" the automatic stop engine
sequence by pressing the "Stop Engine
Override" switch, located on the instrument
panel, until a safe stop can be made. The
operator only needs to press the override
switch every 15 to 20 seconds to prevent the
engine shutdown from occurring.
An important thing to remember is that
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 safe stop.
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.
The conditions that will cause the "Stop
Engine" light to come on are:
■ Loss of coolant
■ High oil temperature
■ Low oil pressure
■ Auxiliary shutdown
It is important to point out that whenever the
CEL or the SEL comes on, the DDEC computer
will determine where the problem is, and will
then store this information in its memory.
If the malfunction is intermittent, the lights
will come on and go off as the computer
senses the changing engine condition.
A special diagnostics tool (Diagnostics
Data Reader, or "DDR") is available that
can be plugged into the engine computer
memory to extract information related to the
cause of the problem.
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