Komatsu PC118MR-8 Operation And Maintenance Manual page 112

INSTRUMENTS AND CONTROLS
5. After another two seconds, the monitor returns to the
standard screen. The orange indicator turns blue again.
(2) Auto-deceleration switch
With the control levers in neutral position, this button (2)
automatically reduces engine speed and activates the fuel
saving function.
q Automatic engine speed limiter indicator light lit: Auto-
deceleration is ON
q Automatic engine speed limiter indicator light off:
Automatic engine speed limiter deactivated
Each time the switch is pressed, the auto-deceleration is
switched between ON and OFF.
q Automatic engine speed limiter function 
With the automatic engine speed limiter function active, if
the work tool and the translation levers are returned to the
N position, after 4 seconds the engine speed is reduced to
the minimum operational speed.
This is to reduce fuel consumption.
If any lever is operated, engine speed returns to the
previous operational speed to allow work to continue.
1. When the automatic engine speed limiter button is pressed
(2) and the function activated, the mode is displayed at the
centre of the monitor which, after two seconds, returns to
the standard screen.
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WEAM014802
FUNCTIONING