Oshkosh Corporation JLG 450AJ Service And Maintenance Manual Download

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SECTION 6 - JLG CONTROL SYSTEM

3121659

– JLG Lift –

6-53

TELESCOPE IN VALVE – OPEN
CIRCUIT

33189 The UGM detects an open circuit at this output

(340AJ, 400S, 450AJ)
The UGM shall suspend Tele-
scope In and Out

(18RS, 24RS) The UGM shall
suspend Telescope In and Out
command and revert to Open
Loop Current control for Tele-
scope

The UGM shall prohibit Tele-
scope Out;
The UGM shall limit Telescope
In to Creep speed after con-
trols initialized

The UGM no longer detects open circuit;
Telescope Out permitted after controls are
initialized;
Full speed Telescope In permitted after con-
trols are initialized

TELESCOPE IN VALVE – SHORT
TO GROUND

33190 The UGM detects a short to ground at this output

The UGM shall prohibit Tele-
scope In and Out

Power Cycled

APU PUMP RELAY - OPEN CIR-
CUIT

33276 The UGM detects an open circuit at this output

No response required for this
DTC

Power Cycled

APU PUMP RELAY - SHORT TO
BATTERY

33277 The UGM detects a short to battery at this output

Disable UGM APU Pump relay
output

Power Cycled

APU PUMP RELAY - SHORT TO
GROUND

33278 The UGM detects a short to ground at this output

Disable UGM APU Pump relay
output

Power Cycled

GLOWPLUG – OPEN CIRCUIT

33279 MACHINE SETUP > ENGINE ≠ DUAL FUEL ECM

MACHINE SETUP > ENGINE ≠ DEUTZ EMR4
MACHINE SETUP > GLOW PLUG ≠ NO
The UGM detects an open circuit at this output

No response required for this
DTC

Power Cycled

GLOWPLUG – SHORT TO BAT-
TERY

33280 MACHINE SETUP > ENGINE ≠ DUAL FUEL ECM

MACHINE SETUP > ENGINE ≠ DEUTZ EMR4
MACHINE SETUP > GLOW PLUG ≠ NO
The UGM detects a short to battery at this output

Disable UGM Glow Plug relay
output

Power Cycled

GLOWPLUG – SHORT TO
GROUND

33281 MACHINE SETUP > ENGINE ≠ DUAL FUEL ECM

MACHINE SETUP > ENGINE ≠ DEUTZ EMR4
MACHINE SETUP > GLOW PLUG ≠ NO
The UGM detects a short to ground at this output

Disable UGM Glow Plug relay
output

Power Cycled

LIFT – CURRENT FEEDBACK
READING TOO LOW

33287 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 Lift
Up and Down command and
revert to Open Loop Current
control for Lift;
The UGM shall limit Lift Up
and Down to Creep speed
after controls initialized

Power Cycled

SWING LEFT VALVE – OPEN CIR-
CUIT

33295 The UGM detects an open circuit at this output

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

The UGM no longer detects open circuit;
Full speed Swing Left and Right permitted
after controls are initialized

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