Failure Code [Dxa8Kb] Pc-Epc Sol Short - Komatsu Galeo PC138US-8 Shop Manual

SEN02466-00

Failure code [DXA8KB] PC-EPC sol short

User code Failure code
E02 DXA8KB
Contents of
• When PC-EPC solenoid was driven, short circuit was detected in circuit.
trouble
Action of • Turns output to PC-EPC solenoid OFF.
controller • 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
• Drive current of PC-EPC solenoid can be checked with monitoring function.
Related
(Code: 01300 PC-EPC solenoid current)
information
• Method of reproducing failure code: Turn starting switch ON.
Defective PC-EPC solenoid
1 (Internal short circuit or
ground fault)
Defective emergency pump
2 drive switch (Internal short
circuit or ground fault)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
3 ness (Contact with GND cir-
cuit)
4 Defective pump controller
4
PC-EPC solenoid system short
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (1) – chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (2), (3) – (4)
Between (2), (3) –
chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between C02 (female) (96)
– S25 (female) (3)
Wiring harness between S25 (female) (5) –
V11 (female) (2)
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (96) – (115), (117),
Between (96) – chassis ground
ing without turning starting switch ON.
V11 (male)
Between (1) – (2)
ing without turning starting switch ON.
Emergency pump
S25 (male)
drive switch
ing without turning starting switch ON.
ing without turning starting switch ON.
C02 (female)
(120)
40 Troubleshooting
Resistance
7 – 14 z
Min. 1 Mz
Resistance
Min. 1 Mz
Normal
Min. 1 Mz
Resis-
tance
Resis-
tance
Resistance
7 – 14 z
Min. 1 Mz
PC138US, USLC-8
1
Min. 1 Mz
Min. 1 Mz