JLG 340AJ, Service And Maintenance Manual

Page: 314 / 370

SECTION 6 - JLG CONTROL SYSTEM
6-68 – JLG Lift – 3121259
TOWER LIFT UP VALVE –
SHORT TO GROUND 33106 The Ground Module detects a short to ground at the Tower Lift Up
Valve output. Ground Module Tower Lift Up
output is disabled; Tower 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.
TOWER LIFT UP VALVE – OPEN
CIRCUIT 33107 The Ground Module detects an open circuit at the Tower Lift Up Valve
output. The Ground Module suspends
Tower Lift Up/Down com-
mands and reverts to Open
Loop Current control for Tower
Lift; Tower Lift speed is limited
to Creep after both Tower Lift
Up/Down controls have been
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.
TOWER LIFT DOWN VALVE –
SHORT TO GROUND 33109 The Ground Module detects a short to ground at the Tower Lift Down
Valve output. Ground Module Tower Lift Up
and Down outputs are dis-
abled. 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.
TOWER LIFT DOWN VALVE –
OPEN CIRCUIT 33110 The Ground Module detects an open circuit at the Tower Lift Down
Valve output. The Ground Module suspends
Tower Lift Up/Down com-
mands and reverts to Open
Loop Current control for Tower
Lift; Tower Lift speed is limited
to Creep after both Tower Lift
Up/Down controls have been
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.
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.
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