JLG 18RS Service Manual - Manual (Page 184)

SECTION 6 - JLG CONTROL SYSTEM
6-42 – JLG Lift – 3121284
PLATFORM LEVEL UP VALVE –
OPEN CIRCUIT 3383 The Ground Module detects an open circuit at the Platform Level Up
Valve output. Platform Level speed is limited
to Creep. Check for a good connection at
the solenoid and for continuity
through this circuit. Inspect
wiring for physical damage.
Cycle power to clear the fault.
PLATFORM LEVEL UP VALVE –
SHORT TO BATTERY 3384 The Ground Module detects a short to battery at the Platform Level
Up Valve output. Ground Module Platform Level
Up, Level Down, and Flow Con-
trol Valve outputs are disabled. Inspect wiring for physical
damage and check for wire
continuity. Cycle power to clear
the fault.
PLATFORM LEVEL DOWN
VALVE – SHORT TO GROUND 3388 The Ground Module detects a short to ground at the Platform Level
Down Valve output. Ground Module Platform Level
Up and Down valve outputs are
disabled. 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.
PLATFORM LEVEL DOWN
VALVE – OPEN CIRCUIT 3389 The Ground Module detects an open circuit at the Platform Level
Down Valve output. Platform Level speed is limited
to Creep. Check for a good connection at
the solenoid and for continuity
through this circuit. Inspect
wiring for physical damage.
Cycle power to clear the fault.
PLATFORM LEVEL DOWN
VALVE – SHORT TO BATTERY 3390 The Ground Module detects a short to battery at the Platform Level
Down Valve output. Ground Module Platform Level
Up, Level Down, and Flow Con-
trol Valve outputs are disabled. Inspect wiring for physical
damage and check for wire
continuity. Cycle power to clear
the fault.
SWING RIGHT VALVE – SHORT
TO GROUND 33118 The Ground Module detects a short to ground at the Swing Right
Valve output. Swing Left and Right outputs
are disabled. 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.
SWING RIGHT VALVE – OPEN
CIRCUIT 33119 The Ground Module detects an open circuit at the Swing Right 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
are 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.
TELESCOPE IN VALVE – SHORT
TO BATTERY 33120 The Ground Module detects a short to battery at the Telescope In
Valve output. Ground Module Telescope In,
Telescope Out, and Flow Con-
trol Valve outputs are disabled. Inspect wiring for physical
damage and check for wire
continuity. 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