JLG 18RS Service Manual - Manual (Page 196)

SECTION 6 - JLG CONTROL SYSTEM
6-54 – JLG Lift – 3121284
DRIVE & BOOM PREVENTED –
PLATFORM OVERLOADED 827 The Platform is Overloaded and
Machine Setup
 LOAD SYSTEM = CUTOUT PLATFORM, Platform
Mode is active, and conditions of Table 6-6, Overload Variations
apply.
-or-
The Platform is Overloaded and Machine Setup
 LOAD SYSTEM =
CUTOUT ALL and conditions of Table 6-6, Overload Variations apply.
Refer to Table 6-6, Overload
Variations for machine
response. Not all of the trigger conditions
are met
LIFT UP & TELE OUT PRE-
VENTED – PLATFORM OVER-
LOADED 828 MACHINE SETUP  LOAD SYSTEM = SPECIAL 1
Platform Mode is active
The platform is Overloaded
Refer to Table 6-6, Overload
Variations for machine
response. Not all of the trigger conditions
are met
LSS READING UNDER WEIGHT 8211 MACHINE SETUP  LOAD SYSTEM NO
The load sensor has been calibrated and Gross Platform Weight <
(0.5 * Empty Platform Weight).
Ground Module to set Platform
Load State = Overloaded Not all of the trigger conditions
are met
FRONT LEFT STEER VALVE –
OPEN CIRCUIT 8639 The Ground Module detects an open circuit at the Front Left Steer
Valve output. Steer Left and Right speed are
limited to Creep Cycle power to clear the fault.
FRONT LEFT STEER VALVE –
SHORT TO BATTERY 8640 The Ground Module detects a short to battery at the Front Left Steer
Valve output. The Ground Module disables
the Drive Forward/Reverse and
Steer Left/Right outputs. Cycle power to clear the fault.
FRONT LEFT STEER VALVE –
SHORT TO GROUND 8641 The Ground Module detects a short to ground at the Front Left Steer
Valve output. The Ground Module disables
the Steer Left and Right out-
puts. Cycle power to clear the fault.
FRONT RIGHT STEER VALVE –
OPEN CIRCUIT 8642 The Ground Module detects an open circuit at the Front Right Steer
Valve output. Steer Left and Right speed is
limited to Creep Cycle power to clear the fault.
FRONT RIGHT STEER VALVE –
SHORT TO BATTERY 8643 The Ground Module detects a short to battery at the Front Right Steer
Valve output. The Ground Module disables
the Drive Forward/Reverse and
Steer Left/Right outputs Cycle power to clear the fault.
FRONT RIGHT STEER VALVE –
SHORT TO GROUND 8644 The Ground Module detects a short to ground at the Front Right Steer
Valve output. The Ground Module disables
the Steer Left and Right out-
puts Cycle power to clear the fault.
OSCILLATING AXLE SWITCH
DISAGREEMENT 8669 The Ground Module detects that Oscillating Axle switch #1 and
switch #2 are not in agreement. Note: This fault will not to be
reported if DTC 23104 BOOM TRANSPORT SWITCH DISAGREEMENT is
active. The Ground Module assumes
an Above Elevation State and
de-energizes J1-7 Oscillating
Axle output. Cycle power to clear the fault.
LSS WATCHDOG RESET 991 The Ground Module detects an LSS report of an anomaly that has
caused a WatchDog Timer reset. The Ground Module sets the
Platform Load State to Over-
loaded Cycle power to clear the fault.
LSS EEPROM ERROR 992 The Ground Module detects an LSS report of an anomaly that exists in
the LSS EEPROM The Ground Module sets the
Platform Load State to Over-
loaded Cycle power to clear the fault.
LSS INTERNAL ERROR – PIN
EXCITATION 993 The Ground Module detects an LSS report of improper excitation
voltage. The Ground Module sets the
Platform Load State to Over-
loaded 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