Komatsu GD555-5 Operation & Maintenance Manual page 247

TROUBLESHOOTING
CONFIRMATION OF FAILURE CODE
1. When action code (A) is displayed, press the top (>) portion of
machine monitor mode selector switch 2 (2) and check the
failure code. Failure code (B) is displayed on character display
(1).
2. Press the top (>) portion of machine monitor mode selector
switch 2 (2) again. The service meter and odometer are
displayed for several seconds, and then the screen returns to
the action code screen.
If 2 or more failures are occurring, the next failure code is
displayed.
3. Check the failure code, then contact your Komatsu distributor
for repairs.
REMARK
The failure code is the code displayed in the 6-digit area on the
left side of the top line of character display (1).
The code displayed on the right side of the failure code
indicates the controller that detected the failure code.
MON: Machine monitor
TM: Transmission controller
ENG: Engine controller
The bottom line of the character display shows the system
where the failure is occurring.
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OPERATION