Failure Code [Dxa0Kb] Pc-Epc Sol. Short Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02631-02

Failure code [DXA0KB] PC-EPC Sol. Short Circuit

Action code Failure code
E02 DXA0KB
Contents of
• Abnormal current flowed to PC-EPC solenoid circuit.
trouble
Action of con- • Sets output to PC-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 • If pump load increases, engine speed lowers largely and engine may stall.
machine
• Output to PC-EPC solenoid (current value) can be checked with monitoring function.
(Code 01300: PC-EPC solenoid current)
Related infor- • If solenoid and wiring harness are not defective, turn emergency drive switch on; the operator can
mation operate the machine with output equivalent to E-mode. (Failure code [DXA0KA] is then displayed,
but it is not defective.)
a
Turn emergency pump drive switch OFF during troubleshooting.
Defective PC-EPC solenoid
1 (Internal short circuit or
ground fault)
Possible causes
Ground fault in wiring har-
and standard
ness
2
value in normal
(Short circuit with GND cir-
state
cuit)
3 Defective pump controller
44
PC-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) (96)
– S21 – V11 (female) (1) and chassis ground
a
Between (96) – chassis ground
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
V11 (male)
Between (1) – (2)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
CP02 (female)
Between (96) –
(115), (117), (120)
40 Troubleshooting
1
Resistance
7 – 14 z
Min. 1 Mz
Resis-
Min. 1 Mz
tance
Resistance
7 – 14 z
Min. 1 Mz
PC300, 350-8