Oshkosh Corporation JLG 450AJ, Service And Maintenance Manual

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SECTION 6 - JLG CONTROL SYSTEM
6-42 – JLG Lift – 3121659
FUNCTION PROBLEM - TOWER
LIFT UP PERMANENTLY
SELECTED 2257 Machine is in Platform Mode;
The Tower Lift Up switch input = High at Startup The UGM shall prohibit Tower
Lift Up and Down The Tower Lift In switch input = Low;
Tower Lift Up and Down permitted after
controls are initialized
FUNCTION PROBLEM - TOWER
LIFT DOWN PERMANENTLY
SELECTED 2258 Machine is in Platform Mode;
The Tower Lift Down switch input = High at Startup The UGM shall prohibit Tower
Lift Up and Down The Tower Lift Down switch input = Low;
Tower Lift Up and Down permitted after
controls are initialized
FUNCTION PROBLEM - PLAT-
FORM LEVEL UP PERMANENTLY
SELECTED 2262 Machine is in Platform Mode;
The Platform Level Up switch input = High at Startup The UGM shall prohibit Plat-
form Level Up and Down The Platform Level Up switch input = Low;
Platform Level Up and Down permitted
after controls are initialized
FUNCTION PROBLEM - PLAT-
FORM LEVEL DOWN PERMA-
NENTLY SELECTED 2263 Machine is in Platform Mode;
The Platform Level Down switch input = High at Startup The UGM shall prohibit Plat-
form Level Up and Down The Platform Level Down switch input =
Low;
Platform Level Up and Down permitted
after controls are initialized
FUNCTION PROBLEM - DOS
OVERRIDE PERMANENTLY
SELECTED 2264 Machine is in Platform Mode;
The DOS Override switch input = High at Startup No response required for this
DTC The DOS Override switch input = Low
FUNCTION PROBLEM - SOFT
TOUCH / SKYGUARD OVERRIDE
PERMANENTLY SELECTED 2286 [(MACHINE SETUP > SKYGUARD = YES) or (MACHINE SETUP >
SOFT TOUCH = YES)];
Machine is in Platform Mode;
The Soft Touch / SkyGuard Override switch input = High at
Startup No response required for this
DTC The Soft Touch / SkyGuard Override switch
input = Low
FUNCTION SWITCHES FAULTY -
CHECK DIAGNOSTICS/BOOM 234 The UGM detects one of the following conditions (continuous
monitoring):
The machine is in Ground Mode and both direction inputs of
the following boom controls are engaged at the same time:
Engine Start/Aux, Telescope, Platform Level, Platform Rotate,
Jib Lift, Tower Lift, Lift, or Swing.
The machine is in Platform Mode and both direction inputs of
the following boom controls are engaged at the same time:
Engine Start/Aux, Telescope, Platform Level, Platform Rotate,
Jib Lift (MACHINE SETUP > JIB = YES), Tower Lift (340AJ,
450AJ); or for Drive Mode – Max Speed/Max Torque Disable whichever boom
functions whose boom con-
trol inputs are triggering the
fault. If Engine Start/Aux at
fault, disable Engine Start but
permit Auxiliary Power/
Emergency Descent. None of the boom controls that trigger this
fault have both of their direction inputs
engaged at the same time
FUNCTION SWITCHES LOCKED -
SELECTED BEFORE AUX POWER 235 The UGM detects one of the following conditions:
The machine is in Ground Mode and the engine is stopped and
the ground APU/Function Enable switch becomes engaged
while a Ground control input is already engaged.
The machine is in Platform Mode and the engine is stopped
and the platform APU/Auxiliary Descent switch becomes
engaged while a Platform control input is already engaged. The UGM not enable Auxiliary
Power/ Emergency Descent
mode The applicable APU/Auxiliary Descent
switch is disengaged or all applicable con-
trol inputs become disengaged or the
engine state becomes ENGINE RUNNING
FUNCTION SWITCHES LOCKED -
SELECTED BEFORE START
SWITCH 236 The UGM detects one of the following conditions:
The machine is in Ground Mode and the engine is stopped and
any configured boom control is already engaged and the
ground start switch changes from not engaged to engaged
The machine is in Platform Mode and the engine is stopped
and any drive/steer or configured boom control is already
engaged and the footswitch is not engaged and the platform
start switch changes from not engaged to engaged The UGM shall prohibit
Engine Start The selected station’s start switch is no lon-
ger engaged
START SWITCH LOCKED -
SELECTED BEFORE KEYSWITCH 237 The start switch for the selected station is engaged during the
UGM startup sequence The UGM shall prohibit
Engine Start The selected station’s start switch is no lon-
ger engaged
Table 6-5. Diagnostic Trouble Code Chart
Help Message DTC
Fault Condition/Trigger
(For configurable items, fault applies only if
configured. All listed conditions to be met unless
stated otherwise)
Required Control
Response or State
Assignment
Conditions Required for Movement
and/or to Clear Fault