JLG 1350SJP Service Manual - Manual (Page 200)

SECTION 3 - CHASSIS & TURNTABLE
3-154 – JLG Lift – 3121142
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 minimum amount of
time while engine speed is above some limit as defined in
the diagnostic calibration
• Corrective Action(s)- Illuminate MIL and/or sound audible
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 damage 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 malfunc-
tioning 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 nor-
mally 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 dam-
age.
BLUE
BLACK/GREEN
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