JLG 24RS Service Manual - Manual (Page 226)

SECTION 6 - JLG CONTROL SYSTEM
6-50 – JLG Lift – 3121287
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.
THROTTLE ACTUATOR FAILURE 4313 For a machine configured with a Kubota D1105 engine:
THROTTLE ACTUATOR – OPEN CIRCUIT (33131) is not active
THROTTLE ACTUATOR – SHORT TO GROUND (33130) is not active
LOSS OF ENGINE SPEED SENSOR (4322) is not active
desired engine speed is greater than 1800 but actual RPM is less than
1400 (debounce time = 3s) when no fault exists with Proportional
Fuel Rack actuator Disable Ground Module Throt-
tle Actuator output and call for
full opening (current =
1500mA) to Proportional Fuel
Rack Actuator. Cycle power to clear the fault.
WRONG ENGINE SELECTED –
ECM DETECTED 4314 Machine is configured with a non-electronic controlled Kubota
D1105 engine and the Ground Module detects an electronic engine
controller on the CAN bus No function inhibits required Cycle power to clear the fault.
LOSS OF ENGINE SPEED SEN-
SOR 4322 Machine is configured with a Kubota D1105 engine and the engine is
running:
LOW OIL PRESSURE fault (4311) is not active
OIL PRESSURE SHORT TO BATTERY fault (433) is not active
No engine shutdown command exists
Engine RPM is read as 0 for 1500ms and Engine oil pressure is not LOW Ground Module to limit all
function speeds to creep, but
run at High Engine speed until
the oil pressure drops to a low
value. Ground Module to dis-
able Generator relay output
until generator operator switch
cycled. Check proper seating/clear-
ance of engine speed sensor
installation. Verify continuity
of wiring before replacing sen-
sor. Fault cleared when Engine
RPM greater than 0
SPEED SENSOR READING
INVALID SPEED 4323 Machine is configured with a Kubota D1105 engine and the engine
RPM reading is greater than 4000 The Ground Module commands
High Engine speed and places
all functions in Creep. Verify integrity of wiring, par-
ticularly the ground, before
replacing sensor. Fault cleared
when engine RPM reading <
4000
FUEL ACTUATOR – SHORT TO
GROUND 4326 The Ground Module detects a short to ground at the fuel actuator
output. (Kubota) The Ground Module disables
the Fuel Actuator output Inspect wiring for physical
damage and check for wire
continuity. Check for coil dam-
age or shorting condition in
connector. Cycle power to clear
the fault.
Table 6-5. 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