JLG 340AJ Service Manual - Manual (Page 306)

SECTION 6 - JLG CONTROL SYSTEM
6-62 – JLG Lift – 3121259
FUEL SENSOR SHORT TO
GROUND 432 Ground Module fuel sensor input (J2-25) detects a voltage less than
or equal to 0.3 volts The Control System shuts down
all fuel level indicators in Plat-
form and Ground stations. Disconnect fuel sender and ver-
ify resistance readings can
range from approximately
30ohms (full) to 240ohms
(empty). If not okay, replace
sender. With fuel sender con-
nected, backprobe J2-25 and
verify voltage range from
approximately 0.5V to 2.3V.
Troubleshoot wiring or connec-
tions.
OIL PRESSURE SHORT TO BAT-
TERY 433 MACHINE SETUP  ENGINE = KUBOTA D1105
Oil Pressure reads a high value at Startup even though the engine has
not been started (occurs for STB or OC – wire off pressure switch)
If MACHINE SETUP  ENGINE
SHUTDOWN = ENABLED then
engine start is not permitted;
Low Oil Pressure indicator will
be activated
Verify wire is connected to oil
pressure switch. With engine
off, switch should show low
impedance to ground or
replace switch. Observe state
change on Analyzer under
DIAGNOSTICS-->ENGINE--
>ENGINE OIL PRESS
COOLANT TEMPERATURE
SHORT TO GROUND 435 MACHINE SETUP  ENGINE = KUBOTA D1105
Ground Module coolant temperature input (J1-14) detects a voltage
less than or equal to 0.05 volts
If MACHINE SETUP  ENGINE
SHUTDOWN = ENABLED then
engine will be shutdown
High Engine Temperature indi-
cator will be activated
Disconnect temperature
sender and verify resistance
reading > 0.15ohms (up to
50kohms is acceptable); then
troubleshoot wiring. With sys-
tem on, backprobe J1-14 and
verify voltage > 1.5V.
ENGINE TROUBLE CODE 437 The engine controller reports a J1939 fault Engine will operate at
1800RPM until power cycle. Cycle power to clear the fault.
HIGH ENGINE TEMP 438 For a machine configured with a Kubota D1105 engine, the engine
has been running more than 10 seconds and the engine coolant tem-
perature is greater than 110ºC:
For a machine with electronic engine controls, the ECM transmits an
engine coolant high temperature critical fault (SPN:FMI 110:0)
If MACHINE SETUP  ENGINE
SHUTDOWN = ENABLED then
the engine will be shut down
and the High Engine Tempera-
ture indicator will be lit
Reduce hydraulic loading of
machine and inspect radiator
for blockage of air flow.
NO ALTERNATOR OUTPUT 4310 The engine has been running more than 10 seconds and Ground
Module system voltage is less than 11.5 volts for 10 seconds The No Charge indicator will be
lit Ground Module system voltage
greater than 11.7 volts
LOW OIL PRESSURE 4311 For a machine configured with a Kubota D1105 engine, the engine
has been running more than 10 seconds and the engine oil pressure is
LOW (debounce 3s).
For a machine with electronic engine controls, the ECM transmits an
engine oil low pressure critical fault (SPN:FMI 100:1). If MACHINE SETUP  ENGINE
SHUTDOWN = ENABLED then
the engine will be shut down
and the Low Oil Pressure indi-
cator will be lit
Check engine oil level. Cycle
power to clear the fault.
Table 6-10. Fault Code Troubleshooting Information
Help Message DTC Condition Producing DTC
Control System Response or
Machine Condition
Corrective Action/
Operational Requirement
for Function Movement
and/or to Clear Fault