JLG 450A_AJ Series II Service Manual - Manual (Page 229)

SECTION 3 - CHASSIS & TURNTABLE
3121180 – JLG Lift – 3-179
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 engine
oil pressure is less than x psia and engine speed is
greater than y RPM after engine has been running for z
seconds as defined in 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 switch is normally open, the fault sets if the circuit
becomes grounded.
If switch is normally closed, fault sets if circuit becomes
open.
Go to Faults page in EDIS to determine how the input is
configured. (“Open=OK” is normally open and
“Ground=OK” is normally closed). The engine should be
configured to derate or force idle and/or shut down in the
event of this fault to prevent possible damage.