JLG 340AJ Service Manual - Manual (Page 300)

SECTION 6 - JLG CONTROL SYSTEM
6-56 – JLG Lift – 3121259
SWING LEFT VALVE – OPEN
CIRCUIT 33295 The Ground Module detects an open circuit at the Swing Left Valve
output. The Ground Module suspends
Swing Left/Right commands
and reverts to Open Loop Cur-
rent control for Swing; Swing
speed is limited to Creep after
both Swing Left/Right controls
have been returned to neutral
and the 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.
FLOW CONTROL VALVE – OPEN
CIRCUIT 33314 The Ground Module detects an open circuit at the Flow Control Valve
output. The Ground Module suspends
output commands and reverts
to Open Current loop control for
Flow Control Valve; Tele In/Out,
Jib Up, Rotate Right/Left, and
Level Up/Down speed are lim-
ited to Creep after controls for
those functions have all been
simultaneously returned to
neutral and the 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.
FLOW CONTROL VALVE –
SHORT TO BATTERY 33315 The Ground Module detects a short to battery at the Flow Control
Valve output. Disable Ground Module Flow
Control Valve output and open
the ground current return path;
disallow energization of valves
for Tele In/Out, Jib Up (permit-
ted if operating in Emergency
Descent mode), Level Up/
Down, or Rotate Right/Left. Inspect wiring for physical
damage and check for wire
continuity. Cycle power to clear
the fault.
FLOW CONTROL VALVE –
SHORT TO GROUND 33316 The Ground Module detects a short to ground at the Flow Control
Valve output. Ground Module Flow Control
Valve output is disabled; disal-
lows energization of valves for
Tele In/Out, Jib Up (permitted if
operating in Emergency
Descent mode), Level Up/
Down, or Rotate Right/Left. 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.
DRIVE FORWARD VALVE –
OPEN CIRCUIT 33317 The Ground Module detects an open circuit at the Drive Forward
Valve output. The Ground Module suspends
Drive Forward/Reverse com-
mands and reverts to Open Cur-
rent loop control for Drive; Drive
speed is limited to Creep after
both Drive Forward/Reverse
controls have been returned to
neutral and the 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.
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