Operation and Maintenance Manual

36 SEBU8180-01
Operation Section
Features and Controls
Engine Oil Pressure Sensor 8
Note: This sensor can have two different locations.
The location will depend on the type of engine.
The engine oil pressure sensor is an absolute
pressure sensor that measures the engine oil
pressure in the main oil gallery. The engine oil
pressure sensor detects engine oil pressure for
diagnostic purposes. The engine oil pressure sensor
sends a signal to the ECM (5).
Low Oil Pressure Warning
The setpoint for the low pressure warning is
dependent upon the engine speed. The fault will be
active and logged only if the engine has been running
for more than 8 seconds.
Very Low Oil Pressure Warning
The very low oil pressure setpoint is dependent
upon the engine speed. If the DERATE mode of the
engine monitoring system is selected, the ECM (5)
will derate the engine power. The engine horsepower
will be limited.
Failure of the Engine Oil Pressure Sensor
The ECM (5) will detect failure of the engine oil
pressure sensor. The diagnostic lamp warns the user
about the status of the engine oil pressure sensor.
The engine oil pressure related strategies will be
disabled in the event of a failure of the engine oil
pressure sensor. A failure of the engine oil pressure
sensor will not cause a shutdown of the engine or
any horsepower change. In order to check the correct
operation of the sensor, refer to Troubleshooting, “5
Volt Sensor Supply Circuit - Test”.
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Engine Shutoffs and Engine
Alarms
SMCS Code: 1900; 7400; 7418
Shutoffs
The shutoffs are electrically operated or mechanically
operated. The electrically operated shutoffs are
controlled by the ECM.
Shutoffs are set at critical levels for the following
items:
• Operating temperature
• Operating level
• Operating rpm
The particular shutoff may need to be reset before
theenginewillstart.
NOTICE
Always determine the cause of the engine shutdown.
Make necessary repairs before attempting to restart
the engine.
Be familiar with the following items:
• Types and locations of shutoff
• Conditions which cause each shutoff to function
• The resetting procedure that is required to restart
the engine
Alarms
The alarms are electrically operated. The operation
of the alarms are controlled by the ECM.
The alarm is operated by a sensor or by a switch.
When the sensor or the switch is activated a signal
is sent to the ECM. An event code is created by
the ECM. The ECM will send a signal in order to
illuminate the lamp.
Your engine may be equipped with the following
sensors or switches:
Coolant level – The low coolant level switch
indicates when the coolant level is low.
Coolant temperature – The coolant temperature
sensor indicates high jacket water coolant
temperature.
Intake manifold air temperature – The intake
manifold air temperature sensor indicates high intake
air temperature.
Intake manifold pressure – The intake manifold
pressure sensor checks the rated pressure in the
engine manifold.
Fuel rail pressure – The fuel rail pressure sensor
checks for high pressure or low pressure in the fuel
rail.
Engine oil pressure –The engine oil pressure
sensor indicates when oil pressure drops below rated
system pressure, at a set engine speed.
• Operating pressure