Section 110-0030
Engine - Engine and Mounting
SM 1691 Rev 1 11-99
4
8. Diagnostic Request Switch - Operates as a
diagnostic request switch when:
a - the engine is not running and ignition is 'On'.
Pressing and releasing the switch will flash out the
engine codes. Pressing the switch a second time will
stop the engine codes flashing.
Note: Active codes are displayed initially, followed by
inactive codes.
9. Diagnostic Test Points - Plug in connector for
diagnostic data reader (DDR).
Operation
Refer to Fig. 3.
When either 'Stop' engine light on the dash panel
illuminates, the computer has detected a major
malfunction in the respective engine that requires
immediate attention. It is the operators responsibility to
shut down the engine to avoid serious damage.
The machine is equipped with an engine protection
system, which records fault codes when an out-of-
range conditions is found. The stop engine and check
engine lights illuminate when the engine protection
system is initiated. If a fault occurs within the tractor
engine, resulting in a loss of power and speed, then
the scraper engine will rampdown in accordance, as a
safety feature, allowing the operator to maintain full
control of the vehicle. The operator MUST shut down
the engine, at the first safe opportunity, to avoid
serious damage.
The engine should not be restarted after it has been
shut down after activation of the engine protection
derate 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 the Check Engine light or Stop Engine light
comes on, the Electronic Management 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.
The operator can check for fault codes by turning the
ignition key switch to the 'OFF' position, pressing the
diagnostic request switch 'ON' and holding it down,
turning the ignition key switch to position '1' and then
releasing the diagnostic request switch. Do NOT start
the engine.
To retrieve any active or inactive (historic) codes
recorded, press the diagnostic request switch. The
fault codes flash in the following sequence: the red
Stop light flashes once, then there is a pause where
both lights are off. Then the numbers of the recorded
fault code flash in amber (Check light). There is a
pause between each number. When the number is
done, the red light flashes again. e.g. red flashes once
- pause - amber flashes twice - pause - amber flashes
three times - pause - amber flashes five times - pause
- red flashes once, indicates fault code 235. If the red
light flashes once again, this indicates that there are
more active codes recorded. If code 111 is flashed, no
faults have been detected. All of the active codes will
be displayed first. Once all the active codes have been
displayed, the red Stop light will flash twice, indicating
the start of the inactive code transmission. These are
displayed in the same manner as the active codes. On
completion of the inactive code transmission, the red
Stop light will flash three times.
Refer to 'Electronic Fuel System Diagnostic Codes'
tables for fault code descriptions.
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 Electronic Management System will return the
engine to normal operation. The fault code recorded in
the ECM memory will remain until it is erased by a
technician.
WARNINGS
The operator of a HEUI-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 HEUI-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.
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