JLG 660AJ Service Manual - Manual (Page 274)

SECTION 6 - JLG CONTROL SYSTEM
6-20 – JLG Lift – 3121616
l/S JOY. CENTER TAP BAD Resistive joysticks: These faults occur when 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 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 start switch is
closed.
FOOTSWITCH SELECTED BEFORE
START User attempted to start machine with footswitch engaged.
2/4 Flash code 2/4 indicates steering digital inputs are faulty.
NOT REQUIRED
2/5 Flash code 2/5 indicates 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 cutout is
configured to prevent simultaneous drive & boom operation.
DRIVE PREVENTED – ABOVE
ELEVATION Drive is selected while above elevation and drive cutout is configured to pre-
vent drive.
DRIVE PREVENTED – BOOM
SELECTED Drive is selected while a boom function is selected and drive cutout is config-
ured 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 – HYDRAU-
LICS SUSPENDED – CYCLE EMS User changed model number using the analyzer. User must cycle power before
hydraulics system will be active again. 11
2/7 Flash code 2/7 indicates 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 a contactor did not close when energized.
NOT REQUIRED
3/2 Flash code 3/2 indicates a contactor did not open when energized.
NOT REQUIRED
3/3 Flash code 3/3 indicates a driver problem. All driver faults are detected in a simi-
lar manner. Open circuit faults are detected when analog feedback reads too
high and the output is commanded off. Short to ground is detected when ana-
log feedback reads low and the output is commanded on. Short to battery is
detected when 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
HOUR METER SHORT TO
BATTERY
HORN SHORT TO GROUND
HORN OPEN CIRCUIT
Table 6-3. Help Fault Codes, Displayed Faults, and Descriptions
Fault Flash
Code
Communicated (Displayed on
Analyzer) Fault
Description Priority