Operation and maintenance manual

Section 110-0030
Engine - Engine and Mounting
SM 2121 Rev 1 11-03
4
To allow for the possibility of the engine protection
system being activated while the machine is operating
in a critical situation, a stop engine override switch (8)
is provided. If the switch is pressed and released
during rampdown, the 30 second timer will reset,
restoring torque to the level immediately following
illumination of stop engine (7) and check engine (6)
lights. The switch must be pressed and released again
to obtain a subsequent override.
Note: The operator must continue to reset the
automatic engine protection system by pressing and
releasing stop engine override switch (8) at intervals of
approximately 15 to 20 seconds.
Note: ECM (1) will record the number of times the
override is activated after the fault occurs. Available
Torque is the actual torque available from the engine
when the fault occurred based on the actual rev/min
when the fault occurred.
The engine should not be restarted after it has been
shut down after activation of the engine protection
system unless the problem has been diagnosed and
corrected.
Conditions that will cause the Stop Engine Light to
come on are; Low Coolant Level, High Coolant
Temperature, Low Oil Pressure and High Oil
Temperature.
Whenever check engine light (6) or stop engine light
(7) comes on, the DDEC computer will determine
where the problem is and will 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 data reader (DDR) is available that
can be plugged into the engine computer memory to
extract information related to the cause of the problem.
Once the malfunction has been corrected, the DDEC
system will return the engine to normal operation. The
DDR can now distinguish between active codes and
those stored in the historic code memory. The
malfunction code recorded in ECM (1) memory will
remain until it is erased by a technician.
WARNINGS
The operator of a DDEC-equipped vehicle must
not attempt to use or read a DDR of any kind
while the vehicle is operating. Doing so can
result in loss of control, which may cause
vehicle damage and may result in personal
injury.
When engine or electronics system
diagnosis is required on a DDEC-equipped
vehicle, this must be done by a person other
than the operator. The operator must maintain
control of the moving vehicle while the
assistant performs the diagnosis.
When the engine is not running and the ignition is on,
or, the engine is idling and not in an engine protection
condition, engine faults can be diagnosed by the
operator. Pressing and releasing diagnostic request
switch (8) will cause check engine light (6) or stop
engine light (7) to flash a code number indicating the
fault, e.g. flash twice - pause - flash five times - pause
indicates a code 25. Code 25 indicates all systems are
operating correctly. Pressing the switch a second time
will stop the engine codes flashing. Refer to 'DDEC III
& IV Diagnostic Codes' table for other code
descriptions.
Note: Only one light will be flashing at any one time.
When code flashing is initiated, the active codes (or
code 25) will be flashed on stop engine light (7), then
the inactive codes (or code 25) will be flashed on
check engine light (6). When all of the inactive codes
have been flashed, the process of flashing the codes
will repeat until the conditions for code flashing are no
longer satisfied.