Komatsu PC138US-11 Operation & Maintenance Manual page 97

OPERATION EXPLANATION OF COMPONENTS
When Lightning in white
When fluctuation of DEF tank level is large, frozen, or not limited to, tank level sensing is not performed correct-
ly.
When DEF is added after engine starting switch turn to OFF.
When DEF tank level sensor is defective.
DEF SYSTEM CAUTION LAMP
DEF system caution lamp alerts when abnormality in the sys-
tem are detected.
Whenever the caution lamp lights up in yellow or in red, take
necessary actions by instructions.
Fault conditions that result in activation of the Inducement strat-
egy for engine derates to prompt to maintain or repair the emis-
sion control system.
Lighting in red
With Action level "L04", Inducement status is "Final Induce-
ment". Engine speed is fixed at low idle.
With Action level "L04", Inducement status is "Severe Inducement". Engine power is under heavy deration.
With Action level "L03", Inducement status is "Mild Inducement". Engine power is under deration.
Lighting in yellow
With Action level "L01", Inducement status is " Warning" or "Escalated Warning".
When "Escalated Warning", If no maintenance, advancing to the next Inducement status. Engine power will be
derated.
DEF SYSTEM HIGH TEMPERATURE STOP CAUTION LAMP
DEF system Temperature stop caution lamp alerts when the
times of engine is shut down under the condition of high degree
temperature of DEF system exceeds the defined number of
times.
Whenever the caution lamp lights up in yellow, it is necessary
to ask your Komatsu distributor to go off this caution lamp.
When stopping the engine, stop it after running it at low idle for
approximately 5 minutes. For details, see "METHOD FOR
STOPPING ENGINE (3-167)".
ENGINE SYSTEM CAUTION LAMP
The engine system caution lamp warns about defect in the en-
gine system.
When action level "L04" appears on screen
The caution lamp comes on in red and the alarm buzzer oper-
ates continuously.
Stop the machine immediately and ask your Komatsu distribu-
tor for inspection and maintenance.
When action level "L03" appears on screen.
The caution lamp comes on in red and the alarm buzzer oper-
ates intermittently.
Move the machine to a safe area and stop the machine, then ask your Komatsu distributor for inspection and
maintenance.
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