Perkins 904J-E36TA Operation And Maintenance Manual page 44

44
Operation Section
Battery Disconnect Switch
NOx Sensors – Two NOx sensors monitor the NOx
concentration within the exhaust gas before and after
the selective catalyst reduction module.
Temperature Sensor – A temperature sensor after
the engine exhaust gas exit, after the DOC and
before the SCR module monitor the temperatures
within the system.
DEF Tank Header Unit – The DEF level sensor
monitors the volume of fluid in the tank and signals
the ECM if the level drops below a given point.
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 2 seconds after
the keyswitch is operated. Replace suspect bulbs
immediately.
Refer to Troubleshooting for more information.
Battery Disconnect Switch
(If Equipped)
Allow at least 2 minutes after the engine has stopped
before you turn the battery disconnect switch to OFF.
Disconnecting the battery power too soon will prevent
purging of the Diesel Exhaust Fluid (DEF) lines after
the engine is shut down. Also, during the 2 minutes
the engine Electronic Control Module (ECM) is active
storing information from the engine and
aftertreatment sensors.
Not allowing the DEF purge to be performed can
damage the DEF system. Not allowing the engine
ECM time to store the information from the sensors
can damage to emission control system.
Some applications, the engine can be equipped with
a wait to disconnect lamp. The wait to disconnect
lamp will be illuminated during engine operation and
will be extinguished approximately 2 minutes after
the engine has stopped.
Illustration 37
Battery disconnect switch label
Do not turn off the battery disconnect switch until the
indicator lamp has turned off. If the switch is turned
off when the indicator lamp is illuminated the Diesel
Exhaust Fluid (DEF) system will not purge the DEF. If
the DEF does not purge, DEF could freeze and dam-
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age the pump and lines.
Never move the battery disconnect switch to the OFF
position while the engine is operating. Serious dam-
age to the electrical system could result.
Gauges and Indicators
Your engine may not have the same gauges or all of
the gauges that are described. For more information
about the gauge package, see the OEM information.
Gauges provide indications of engine performance.
Ensure that the gauges are in good working order.
Determine the normal operating range by observing
the gauges over a period.
Noticeable changes in gauge readings indicate
potential gauge or engine problems. Problems may
also be indicated by gauge readings that change
even if the readings are within specifications.
Determine and correct the cause of any significant
change in the readings. Consult your Perkins dealer
or your Perkins distributor for assistance.
Some engine applications are equipped with
Indicator Lamps. Indicator lamps can be used as a
diagnostic aid. There are two lamps. One lamp has
an orange lens and the other lamp has a red lens.
These indicator lamps can be used in two ways:
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NOTICE
NOTICE
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