JLG 18RS Service Manual - Manual (Page 186)

SECTION 6 - JLG CONTROL SYSTEM
6-44 – JLG Lift – 3121284
GLOWPLUG – SHORT TO BAT-
TERY 33280 The Ground Module detects a short to battery at the Glow Plug out-
put. (Kubota) Ground Module Glow Plug relay
output is disabled. Inspect wiring for physical
damage and check for wire
continuity. Cycle power to clear
the fault.
LIFT – CURRENT FEEDBACK
READING TOO LOW 33287 The Ground Module calls for current greater than 250mA, but the
actual current is at least 125mA less than the called for current for
more than 1 second 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 the
machine is not Enabled Part of the commanded current
is being divided either prior to
the solenoid connection or on
the ground return path. Inspect
wiring for physical damage and
check for wire continuity and a
low resistance return path.
Cycle power to clear the fault.
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.
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