Oshkosh JLG 400S, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-172 – JLG Lift – 3120895
DTC 524- Oil Pressure Low
• Engine Oil Pressure
• Check Condition- Key on, Engine on
• Fault Condition- Engine oil pressure lower than
expected while engine has been running for a mini-
mum amount of time while engine speed is above
some limit as defined in the diagnostic calibration
• Corrective Action(s)- Illuminate MIL and/or sound audi-
ble warning or illuminate secondary warning lamp,
generally configured to derate the engine and trigger
an engine shutdown
• Non-emissions related fault
The ECM can be configured to monitor oil pressure
through a proportional transducer or through a switch. Oil
pressure monitoring is important to prevent engine dam-
age due to low oil pressure resulting in higher friction and
lack of lubrication. In addition, high oil pressure can be
undesirable because it can cause oil to leak past seals
and rings, can be a result of a restriction in the oil flow
path, or can be a sign of a malfunctioning oiling system.
For systems that use a transducer, this fault sets if the
engine oil pressure is less than x psia and engine speed is
greater than y RPM after the engine has been running for
z seconds as defined in the diagnostic calibration. For
systems that use a switch this fault can be configured two
different ways. It may use a normally closed switch or a
normally open switch. If the switch is normally open, the
fault will set if the circuit becomes grounded. If the switch
is normally closed, the fault will set if the circuit becomes
open. Go to the Faults page in EDIS to determine how the
input is configured. ("Open=OK" is normally open and
"Ground=OK" is normally closed). The engine will should
be configured to derate or force idle and/or shut down in
the event of this fault to help prevent possible damage.