4-2
GTH-1256
Part No. 1272856
September 2016
Section 4 • Fault Codes
Diagnostic Display
When the engine Electronic Control Module (ECM)
detects an abnormal operating condition, a fault
code is immediately stored in the ECM memory.
The presence of faults is indicated by the word
“SERVICE” (replacing GENIE) on the LCD display
which is located on the gauge cluster in the
operator's compartment.
The gauge cluster also includes two warning
lights.
They are an amber colored light which signals
an abnormal engine condition which should be
corrected as soon as possible and a red colored
light which signals an engine condition which
requires the operator to shut down the engine as
soon as possible.
The ECM will, in some cases, automatically shut
down the engine when the red light is displayed.
Active Fault Codes
To make the active fault codes visible, start the
engine, press the diagnostic button “d” and hold it
pressed for at least 5 seconds.
To quit the active fault codes page, press the
diagnostic button “d” and hold it pressed for at
least 5 seconds.
Active Codes vs Stored Codes
Active fault codes, indicating an engine condition
or conditions which have not been corrected,
are signaled on the LCD display by the word
"SERVICE" replacing “GENIE”.
Stored fault codes are the cumulative history of
fault codes which the ECM has detected. These
fault codes may be recalled by service personnel
at a later time even if the condition which caused
the engine fault has ceased to exist.
Note: Additional hardware will be necessary to
access stored codes.
Decoding Fault Codes
The Suspect Parameter Number (SPN) and the
Failure Mode Identi
fi
er (FMI), when combined,
are the basis for an engine fault code. The SPN
number indicates the affected component; the
FMI number reveals the type of failure that has
occurred. Comparing the combination of numbers
to the fault code chart on the following pages
will help to determine the exact engine fault
and a corrective course of action. For additional
information, refer to the engine operator's manual
which came with your machine.
FAULT CODES
engine rpm
000000.0
1230
°c
105
60
Gauge Cluster
a LCD
screen
b amber warning light
c stop engine light
d diagnostic
button
d
a
b
c
