JLG 340AJ Service Manual - Manual (Page 293)

SECTION 6 - JLG CONTROL SYSTEM
3121259 – JLG Lift – 6-49
LIFT UP VALVE – OPEN CIRCUIT 334 The Ground Module detects an open circuit at the lift up valve output. The Ground Module suspends
the Lift Up/Down command
and reverts to Open Loop Cur-
rent control for Lift; Lift speed is
limited to Creep after both Lift
Up/Down controls are returned
to neutral and the machine
controls are not Enabled. Inspect wiring for physical
damage. Check for a good con-
nection at the solenoid and for
continuity through the circuit.
With the solenoid discon-
nected, an open circuit voltage
of nearly 8.0V exists on the
Ground Module output pin for
diagnostic purposes. Cycle
power to clear the fault.
LIFT DOWN VALVE – SHORT TO
GROUND 335 The Ground Module detects a short to ground at the Lift Down valve
output. Ground Module Lift Up and
Down outputs are disabled. Inspect wiring for physical
damage and check for wire
continuity. Cycle power to clear
the fault.
LIFT DOWN VALVE – OPEN
CIRCUIT 336 The Ground Module detects an open circuit at the Lift Down valve
output. The Ground Module suspends
Lift Up/Down commands and
reverts to Open Loop Current
control for Lift; Lift speed is lim-
ited to Creep after both Lift Up/
Down controls have been
returned to neutral and
machine is not Enabled. 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.
GROUND ALARM – SHORT TO
BATTERY 3311 The Ground Module detects a short to battery at the Ground Alarm
output. No response required. Inspect wiring for physical
damage and check for wire
continuity. Cycle power to clear
the fault.
MAIN DUMP VALVE – SHORT
TO GROUND 3358 The Ground Module detects a short to ground at the Main Dump
Valve output. The Main Dump Valve output is
disabled. Inspect wiring for physical
damage and check for wire
continuity. Cycle power to clear
the fault.
MAIN DUMP VALVE – OPEN
CIRCUIT 3359 The Ground Module detects an open circuit at the Main Dump Valve
output. No response required. 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.
MAIN DUMP VALVE – SHORT
TO BATTERY 3360 The Ground Module detects a short to battery at the Main Dump
Valve output. Ground Module Main Dump,
Swing Left/Right, Tower Lift
Up, and Lift Up outputs are dis-
abled. 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