Section 110-0030
Engine - Engine and Mounting
SM 1172 2-98
4
code, pressing the bottom of the will go back to the
previous code.
On machines which have a Low Idle Adjustment
feature, this switch can also be used to increase or
decrease (in increments of 25 RPM), the idle or
intermediate speed of the engine.
Operation
Numbers in parentheses refer to Fig. 2.
The machine is equipped with the Quantum engine
protection system which records fault codes in the
ECM (1), when the engine malfunctions and when an
out-of-range condition is found.
When the 'Stop' light (6) on the dash panel illuminates,
the computer has detected a major malfunction in the
engine that requires immediate attention. It is the
operators responsibility to shut down the engine to
avoid serious damage.
When an out-of-range conditions is found, the 'Fluid'
light (8) illuminates and the engine protection system
is initiated. The 'Fluid' light will start to flash if the out-
of-range condition continues to get worse. The
operator MUST shut down the engine to avoid serious
damage.
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 amber 'Fluid' light (8) to
come on are; Low coolant level, High coolant
temperature, Idle validation/throttle pedal switch
mismatch, High intake manifold temperature, Low oil
pressure and High fuel rail pressure.
Whenever the 'Stop' light (6), 'Warning' light (7) or
'Fluid' light (8) come on, the Electronic Fuel System
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 (INSITE) is available
that can be plugged into the engine computer memory
via the onboard diagnostic test point (9). The reader is
used to extract information related to the cause of the
problem. Once the malfunction has been corrected,
the Electronic Fuel System will return the engine to
normal operation. The data reader can now distinguish
between active codes and those stored in the historic
code memory (inactive codes). Inactive codes can
only be viewed using the data reader. The fault code
recorded in the ECM memory will remain until it is
erased by a technician.
WARNINGS
The operator of a Quantum-equipped vehicle
must not attempt to use or read a data reader
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.
The operator can check for active faults by turning the
ignition key switch to the 'OFF' position, switching the
diagnostic switch 'ON' and then turning the ignition key
switch to position '1'.
If no active fault codes are recorded, all three ('Stop',
'Warning' & 'Fluid') lights will come on and stay on. If
active codes are recorded, all three lights will come on
momentarily. The yellow ('Warning') and red ('Stop')
lights will begin to flash the code of the recorded fault.
The fault codes flash in the following sequence: the
yellow light flashes once, then there is a pause where
both lights are off. Then the numbers of the recorded
fault code flash in red. There is a pause between each
number. When the number is done, the yellow light
flashes again. e.g. yellow flashes once - pause - red
flashes twice - pause - red flashes three times - pause
- red flashes five times - pause - yellow flashes once,
indicates fault code 235. The number will repeat in the
same sequence until the the system is advanced to
the next active fault code or the diagnostic switch is
switched to the 'OFF' position. Refer to 'Electronic Fuel
System Diagnostic Codes' table for fault code
descriptions.
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