Komatsu PC130-7, Shop Manual

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20-352
PC130-7
TROUBLESHOOTING
Error code [301] (Engine low idling speed out of standard range)
Error code [302] (Engine high idling speed out of standard range)
User code Error code
Trouble
Engine low idling speed out of standard range
(Governor and pump controller system)
– 301
Contents of
trouble
• Engine speed below 500 rpm is sensed for continuous 10 seconds while the engine is running.
Action of
controller
• None in particular.
• If the cause of the failure disappears, the system resets itself.
Problem that
appears on
machine
• If the machine is operated as it is, the engine may be damaged.
Related
information
• The input state (rpm) from the engine speed sensor can be checked with the monitoring function.
(Code: 010, by 10 rpm)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Abnormality in mechanical
system of engine
Check for external and internal factors that have lowered the engine low
idling speed, and then carry out troubleshooting for the mechanical sys-
tem of the engine.
2
Defective governor and
pump controller
Troubleshooting cannot be carried out since the defect is in the gover-
nor and pump controller. (If there is not any visible trouble in the
machine, the controller may be used as it is.)
User code Error code
Trouble
Engine high idling speed out of standard range
(Governor and pump controller system)
– 302
Contents of
trouble
• Engine speed above 2,600 rpm is sensed for continuous 10 seconds while the engine is running.
Action of
controller
• None in particular.
• If the cause of the failure disappears, the system resets itself.
Problem that
appears on
machine
• If the machine is operated as it is, the engine may be damaged.
Related
information
• The input state (rpm) from the engine speed sensor can be checked with the monitoring function.
(Code: 010, by 10 rpm)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Abnormality in mechanical
system of engine
Check for external and internal factors that have heightened the engine
high idling speed, and then carry out troubleshooting for the mechanical
system of the engine.
2
Defective governor and
pump controller
Troubleshooting cannot be carried out since the defect is in the gover-
nor and pump controller. (If there is not any visible trouble in the
machine, the controller may be used as it is.)
[301], [302]
(1)