Detroit Diesel 60 Series Operator's Manual page 23

In this situation the operator may elect
to "override" the automatic stop engine
sequence by pressing the "Stop Engine
Override" switch, located on the instru-
ment panel, until a safe stop can be
made. The operator only needs to press
the override switch every 15 to 20 sec-
onds to prevent engine shutdown from
occurring.
NOTICE:
For some applications, holding the
"Stop Engine Override" switch in 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.
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 contin-
ue 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 correct-
ed.
The conditions that will cause the "Stop
Engine" light (SEL) to come on are:
High coolant temperature
Loss of coolant
High oil temperature
Low oil pressure
Auxiliary shutdown
It is important to point out that whenever
the "Check Engine" light (CEL) or the
"Stop Engine" light (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 diagnostic tool (Diagnostic
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. See Figure 9.
Figure 9. Diagnostic Data Reader J38500
Once the malfunction has been cor-
rected, the DDEC system will return the
engine to normal operation.
The DDR can distinguish between
codes now active and those stored in
the ECM memory (inactive).
The malfunction code recorded in the
computer memory will remain until it is
erased by a technician.
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