JLG 24RS Service Manual - Manual (Page 223)

SECTION 6 - JLG CONTROL SYSTEM
3121287 – JLG Lift – 6-47
SWING – CURRENT FEEDBACK
READING LOST 33418 Measured feedback current is less than 225mA while Ground Module
output is greater than 40% (Displayed on Analyzer DIAGNOSTICS
menu). 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 have
been returned to neutral and
the machine is not Enabled. Part or all of the commanded
current is being diverted from
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.
FLOW CONTROL VALVE – CUR-
RENT FEEDBACK READING
LOST 33419 Measured feedback current is less than 225mA while Ground Module
output is greater than 40% (Displayed on Analyzer DIAGNOSTICS
menu). The Ground Module suspends
and reverts to Open Current
loop control for Flow Control
Valve; Tele In/Out, Jib Up,
Rotate Right/Left, and Level
Up/Down speed is limited to
Creep after controls for those
functions have all been simul-
taneously returned to neutral
and the machine is not Enabled Part or all of the commanded
current is being diverted from
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.
TRACTION LOCK VALVE –
SHORT TO BATTERY 33420 The Ground Module detects a short to battery at the Traction Lock
valve output. If in Max Speed drive mode, the
machine switches to Max
Torque; Max Speed drive mode
is disabled. Inspect wiring for physical
damage and check for wire
continuity. Cycle power to clear
the fault.
TRACTION LOCK VALVE – OPEN
CIRCUIT 33421 The Ground Module detects an open circuit at the Traction Lock valve
output. If in Max Speed drive mode, the
machine switches to Max
Torque; Max Speed drive mode
is disabled. Check for a good connection at
the solenoid and for continuity
through this circuit. Inspect
wiring for physical dam-
age.Cycle power to clear the
fault.
TRACTION LOCK VALVE –
SHORT TO GROUND 33422 The Ground Module detects a short to ground at the Traction Lock
valve output. Traction Lock valve output is
disabled. If in Max Speed drive
mode, the machine switches to
Max Torque; Max Speed drive
mode is 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 ROTATE LEFT
VALVE – OPEN CIRCUIT 349 The Platform Module detects an open circuit at the Platform Rotate
Left Valve output and reports it to the Ground Module. Platform Rotate speed is lim-
ited 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 ROTATE LEFT
VALVE – SHORT TO BATTERY 3410 The Platform Module detects a short to battery at the Platform
Rotate Left Valve output and reports it to the Ground Module. Platform Module are disabled
for Platform Rotate Right,
Rotate Left, and Flow Control
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