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.
Engine overspeed
– The primary speed/timing
sensor checks the engine speed. The alarm is
activated at 3000 RPM.
Air filter restriction
– The switch checks the air filter
when the engine is operating.
User defined switch
– This switch can shut down
the engine remotely.
Water in fuel switch
– This switch checks for water
in the primary fuel filter when the engine is operating.
Note:
The sensing element of the coolant
temperature switch must be submerged in coolant in
order to operate.
Engines may be equipped with alarms in order to
alert the operator when undesirable operating
conditions occur.
NOTICE
When an alarm is activated, corrective measures
must be taken before the situation becomes an emer-
gency in order to avoid possible engine damage.
If corrective measures are not taken within a
reasonable time, engine damage could result. The
alarm will continue until the condition is corrected.
The alarm may need to be reset.
Testing
Turning the keyswitch to the ON position will check
the indicator lights on the control panel. All the
indicator lights will be illuminated for two seconds
after the keyswitch is operated. Replace suspect
bulbs immediately.
Refer to Troubleshooting for more information.
i02237393
Overspeed
An
overspeed
condition
is
detected
by
the
Electronic
Control
Module
(ECM).
The
event
code
will
be
logged
if
the
engine
speed
exceeds
3000
rpm.
The
“
DIAGNOSTIC
”
lamp
will
indicate
a
diagnostic
active
code.
The
diagnostic
active
code
will
remain
active
until
the
engine
speed
drops
to
2800
rpm.
SEBU8172-04
37
