JLG 450A_AJ Series II Service Manual - Manual (Page 209)

SECTION 3 - CHASSIS & TURNTABLE
3121180 – JLG Lift – 3-159
Accessing fault information is accomplished through a
double left-click of the fault LED in the historic fault list.
This produces the Historic Fault Information interface
shown in Figure 3-100. From this interface a user can
interpret a diagnostic trouble code (DTC) message, iden-
tify whether or not the fault occurred during the current
key cycle, identify if the fault caused engine shutdown,
determine how many key cycles have occurred since fault
was last active, clear selected or all historic faults, and
view snapshot and flight data. Table 3-19
outlines options
displayed in the Historic Fault Information screen. Historic
faults are not overwritten if the same fault becomes active,
storing data from the original active fault.
Figure 3-101. is an example of a fault snapshot after View
Fault Snapshot is selected. Data is presented in two col-
umns; base and custom variables. FSS data may be
saved to a PC in text format with an .fss extension when
retrieved. An FSS saved to a PC may be reviewed in any
ASCII based software program.
Figure 3-102. shows the Flight Data Recorder interface
after View Flight Data Recorder is selected. The FDR cap-
tures a ten second (eight seconds prior and two seconds
after generating the fault) strip of data for base and cus-
tom variables. FDR data is presented in an interface simi-
lar to the Plot interface for a quick graphical presentation.
From this interface, FDR data may be saved to the PC in
text, tab-delimited format with an .fdr file extension. Once
saved to PC, FDR data may be reviewed with any graphi-
cal post-processing software capable of handling tab-
delimited formatting.
Fault information may be manually erased using the
“Clear” button functions. Once a “Clear” function has
been selected, the dialog prompt shown in
Figure 3-103.
will be displayed. Choosing YES deletes all fault informa-
tion from the ECM.
DBW Diagnostic Test
The DGC engine control module uses a diagnostic test to
verify proper drive-by-wire throttle actuator operation. This
diagnostic test is software selectable through the EDIS
using the ECIPP protocol. The test permits full-authority
operation of an electronic throttle via the throttle com-
mand input while engine is in “Stopped” state only. The
ECM reverts to normal operation if “Off” state is selected,
ignition voltage is lost, or engine speed is sensed.
To enable test, go to DBW page of the EDIS. Set “DBW
test mode” to “Enabled”. Double-click “TPS Command”
setting and enter desired DBW throttle actuator position.
The throttle actuator should move to position entered. To
disable test, set “DBW test mode” to “Off.”
Figure 3-99. Custom Fault Variable Interface