Failure Code [Dxe4Kb] Service Current Epc Short Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

40 Troubleshooting

Failure code [DXE4KB] Service Current EPC Short Circuit

Action code Failure code
— DXE4KB
Contents of
• Abnormal current flowed to service current EPC solenoid circuit.
trouble
Action of con- • Sets output to service current EPC solenoid circuit to 0.
troller • Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on • Attachment does not move.
machine
• Carry out troubleshooting only for setting with ATT. (Confirm settings on the monitor panel.)
Related infor-
• Output to service current EPC solenoid (current value) can be checked with monitoring function.
mation
(Code 01700: Service solenoid current)
Defective service current
1 EPC solenoid (Internal short
circuit or ground fault)
Possible causes
and standard
Hot short (Short circuit with
2
value in normal
24V circuit) in wiring harness
state
3 Defective pump controller
Circuit diagram related to service current EPC solenoid of pump controller
PC300, 350-8
Service current EPC solenoid short circuit
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a
Between (1) – chassis ground
a
Wiring harness between CP02 (female) (97)
– V30 (female) (1) and chassis ground
a
Between (97) – chassis ground
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
V30 (male)
Between (1) – (2)
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
CP02 (female)
Between (97) –
(115), (117), (120)
SEN02631-02
1
Resistance
7 – 14 z
Min. 1 Mz
Voltage Max. 1 V
Resistance
7 – 14 z
Min. 1 Mz
51