Komatsu 80001 - Failure Code [DXA8 KB] PC-EPC Sol Short

SEN04122-01 40 Troubleshooting
4 PC130-8
Failure code [DXA8KB] PC-EPC sol short 1
User code Failure code
Trouble
PC-EPC solenoid system short
(Pump controller system)
E02 DXA8KB
Contents of
trouble
• When PC-EPC solenoid was driven, short circuit was detected in circuit.
Action of
controller
• Turns output to PC-EPC solenoid OFF.
• Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on
machine
• If pump load increases, engine speed lowers largely and engine may stall.
Related
information
• Drive current of PC-EPC solenoid can be checked with monitoring function.
(Code: 01300 PC-EPC solenoid current)
• Method of reproducing failure code: Turn starting switch ON.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective PC-EPC solenoid
(Internal short circuit or
ground fault)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
V11 (male) Resistance
Between (1) – (2) 7 – 14 z
Between (1) – chassis ground Min. 1 Mz
2
Defective emergency pump
drive switch (Internal short
circuit or ground fault)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
S25 (male)
Emergency pump
drive switch
Resistance
Between (2), (3) – (4)
Normal
Min. 1 Mz
Between (2), (3) –
chassis ground
Min. 1 Mz
3
Ground fault in wiring har-
ness (Contact with GND cir-
cuit)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CP02 (female) (96)
– S25 (female) (3) and chassis ground
Resis-
tance
Min. 1 Mz
Wiring harness between S25 (female) (5) –
V11 (female) (2) and chassis ground
Resis-
tance
Min. 1 Mz
4 Defective pump controller
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
CP02 (female) Resistance
Between (96) – (115), (117),
(120)
7 – 14 z
Between (96) – chassis ground Min. 1 Mz