JLG 340AJ Service Manual - Manual (Page 307)

SECTION 6 - JLG CONTROL SYSTEM
3121259 – JLG Lift – 6-63
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.
FUEL ACTUATOR – OPEN CIR-
CUIT 4327 The Ground Module detects an open circuit at the fuel actuator out-
put. (Kubota) The Ground Module controls
revert to Open Loop and restrict
machine speeds to Creep. Check for a good connection at
the solenoid and for continuity
through this circuit. With the
solenoid disconnected, an
open circuit voltage of nearly
8.0V exists on the Ground Mod-
ule output pin for diagnostic
purposes. Inspect wiring for
physical damage. Cycle power
to clear the fault.
FUEL ACTUATOR – SHORT TO
BATTERY 4328 The Ground Module detects a short to battery at the fuel actuator
output. (Kubota) Disable Ground Module Fuel
Actuator output and open the
ground current return path. Inspect wiring for physical
damage and check for wire
continuity. 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