JLG 660SJ Service Manual User Manual
Page 268
SECTION 6 - JLG CONTROL SYSTEM
6-22
– JLG Lift –
3121202
l/s joy. center tap bad
Resistive joysticks: These faults occur when the center tap voltage is not
between 3.08 volts and 3.83 volts. Due to resistor tolerances there is a +/-
.1 volt range around these values where the fault may be indicated.
Inductive joysticks: These faults occur when the center tap voltage is not
between 2.18 volts and 2.70 volts. Due to resistor tolerances there is a +/-
.1 volt range around these values where the fault may be indicated.
PUMP SWITCHES LOCKED –
SELECTED BEFORE START
SWTICH
This fault occurs when a hydraulic function switch is closed before the start
switch is closed.
FOOTSWITCH SELECTED
BEFORE START
The user attempted to start the machine with the footswitch engaged.
2/4
Flash code 2/4 indicates that steering digital inputs are faulty.
NOT REQUIRED
2/5
Flash code 2/5 indicates that a function is prevented due to a cutout.
4
BOOM PREVENTED – DRIVE
SELECTED
A boom function is selected while a drive function is selected and drive cut-
out is configured to prevent simultaneous drive & boom operation.
DRIVE PREVENTED – ABOVE
ELEVATION
Drive is selected while above elevation and drive cutout is configured to
prevent drive.
DRIVE PREVENTED – BOOM
SELECTED
Drive is selected while a boom function is selected and drive cutout is con-
figured to prevent simultaneous drive & boom operation.
DRIVE PREVENTED – TILTED
& ABOVE ELEVATION
Drive is selected while tilted and above elevation and tilt is configured to
cutout drive.
MODEL CHANGED –
HYDRAULICS SUSPENDED –
CYCLE EMS
User changed the model number using the analyzer. User must cycle
power before the hydraulics system will be active again.
11
2/7
Flash code 2/7 indicates that the accelerator input is faulty.
NOT REQUIRED
2/8
Flash code 2/8 indicates a problem with a hydraulic filter. Not
reported during 2 second power-up.
5
RETURN FILTER BYPASSED
Hydraulic return filter clogged
charge pump filter bypassed
Charge pump filter clogged
3/1
Flash code 3/1 indicates that a contactor did not close when ener-
gized.
NOT REQUIRED
3/2
Flash code 3/2 indicates that a contactor did not open when ener-
gized.
NOT REQUIRED
3/3
Flash code 3/3 indicates a driver problem. All driver faults are
detected in a similar manner. Open circuit faults are detected when the
analog feedback reads too high and the output is commanded off.
Short to ground is detected when the analog feedback reads low and
the output is commanded on. Short to battery is detected when the
analog feedback reads Vbat and the output is commanded off. Not
reported during 2 second power-up.
6
ALTERNATOR/ECM POWER
SHORT TO GROUND
HOUR METER SHORT TO
GROUND
Table 6-2. Help Fault Codes, Displayed Faults, and Descriptions
Fault Flash
Code
Communicated (Displayed on
Analyzer) Fault
Description
Priority