Komatsu PC400LC-5 Operation & Maintenance Manual page 144

16.6.4 ELECTRONIC CONTROL SYSTEM
MONITOR PANEL
When the starting switch is turned ON before starting the engine,
all the monitor lamps and the gauges light up and the alarm buzzer
sounds for about 3 seconds. If any monitor lamp does not light up,
there is probably a broken bulb or disconnection in the monitor, so
ask your Komatsu distributor to inspect it.
Park the machine on level ground and check the monitor lamps.
ENGINE THROTTLE CONTROLLER AND PUMP CONTROLLER
If any abnormality occurs, the abnormality is indicated by the
lamp and an 8-digit code. Check the content of the display and
contact your Komatsu distributor for repairs.
Pump controller
Engine throttle controller
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