Perkins 1104D Operation And Maintenance Manual page 36

36
Operation Section
Engine Shutoffs and Engine Alarms
In order to check the correct operation of the sensor,
refer to Troubleshooting, "Engine speed/Timing
sensor - Test".
Secondary Speed/Timing Sensor 7
The signal from the secondary speed/timing sensor is
used by the ECM (5) on engine start-up in order to
check the stroke of the pistons. The secondary
speed/timing sensor may be used by the ECM in
order to operate the engine if the primary speed/
timing sensor is faulty.
In order to check the correct operation of the sensor,
refer to Troubleshooting, "Engine speed/Timing
sensor-Test".
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".
Engine Shutoffs and Engine
Alarms
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 pressure
• Operating level
• Operating rpm
The particular shutoff may need to be reset before
the engine will start.
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.
SEBU8172-04
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