Oshkosh Corporation JLG 450AJ, Service And Maintenance Manual

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SECTION 6 - JLG CONTROL SYSTEM
3121659 – JLG Lift – 6-55
DRIVE – CURRENT FEEDBACK
READING TOO LOW 33331 The Engine State = ENGINE RUNNING;
The UGM commanded current > 250mA;
The difference between the commanded current and the
measured feedback current > [the larger of (125mA) or (15%
of the commanded function Max)] for longer than 1 second
The UGM shall suspend Drive
Forward and Reverse com-
mand and revert to Open Cur-
rent loop control for Drive;
The UGM shall limit Drive For-
ward and Reverse to Creep
speed after controls initial-
ized Power Cycled
LIFT UP VALVE – SHORT TO
GROUND 33406 The UGM detects a short to ground at this output The UGM shall prohibit Lift
Up;
The UGM shall limit Lift Down
Creep speed Power Cycled
LIFT DOWN VALVE – SHORT TO
GROUND 33407 The UGM detects a short to ground at this output The UGM shall prohibit Lift Up
and Down Power Cycled
DRIVE – LOSS OF CURRENT
FEEDBACK 33410 Measured feedback current < 225mA while PWM output >
40% for a period of 100ms.
The UGM shall suspend Drive
Forward and Reverse com-
mand and revert to Open Cur-
rent loop control for Drive;
The UGM shall limit Drive For-
ward and Reverse to Creep
speed after controls initial-
ized Power Cycled
SWING VALVES – SHORT TO
BATTERY 33412 The UGM detects a short to battery at either the Swing Right or
Swing Left valve
The UGM shall prohibit Swing
Left and Right;
The UGM shall open the
Swing Current Feedback low
side FET Power Cycled
TOWER LIFT – CURRENT FEED-
BACK READING TOO LOW 33413 The Engine State = ENGINE RUNNING;
The UGM commanded current > 250mA;
The difference between the commanded current and the
measured feedback current > [the larger of (125mA) or (15%
of the commanded function Max)] for longer than 1 second
The UGM shall suspend Tower
Lift Up and Down command
and revert to Open Loop Cur-
rent control for Tower Lift;
The UGM shall limit Tower Lift
Up and Down to Creep speed
after controls initialized Power Cycled
SWING – CURRENT FEEDBACK
READING TOO LOW 33414 The Engine State = ENGINE RUNNING;
The UGM commanded current > 250mA;
The difference between the commanded current and the
measured feedback current > [the larger of (125mA) or (15%
of the commanded function Max)] for longer than 1 second
The UGM shall suspend Swing
Left and Right command and
revert to Open Loop Current
control for Swing;
The UGM shall limit Swing
Left and Right to Creep speed
after controls initialized Power Cycled
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