JLG 340AJ, Service And Maintenance Manual

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SECTION 6 - JLG CONTROL SYSTEM
3121259 – JLG Lift – 6-73
DRIVE – CURRENT FEEDBACK
READING TOO LOW 33331 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
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. 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.
LIFT UP VALVE – SHORT TO
GROUND 33406 The Ground Module detects a short to ground at the Lift Up Valve out-
put. Lift Up is disabled; Lift Down
speed is limited to Creep 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 – LOSS OF CURRENT
FEEDBACK 33410 Measured feedback current is less than 225mA while Ground Module
output is greater than 40% (Displayed on Analyzer DIAGNOSTICS
menu). 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. 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.
SWING VALVES – SHORT TO
BATTERY 33412 The Ground Module detects a short to battery at either the Swing
Right or Swing Left valve Ground Module Swing Left and
Right outputs are disabled and
open the ground current return
path is open circuited. Inspect wiring for physical
damage and check for wire
continuity. Cycle power to clear
the fault.
TOWER LIFT – CURRENT FEED-
BACK READING TOO LOW 33413 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
Tower Lift commands and
reverts to Open Current loop
control for Tower Lift; Tower Lift
speed is limited to Creep after
both Tower Lift Up/Down con-
trols 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 – CURRENT FEEDBACK
READING TOO LOW 33414 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
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 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.
Table 6-15. 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