Komatsu ecot3 PC300LC-8 Shop Manual page 666

SEN02630-05
Ground fault in wiring har-
2 ness (Short circuit with GND
circuit)
Possible causes
and standard
value in normal
state
Hot short (Short circuit with
3 24 V circuit) in wiring har-
ness
4 Defective pump controller
64
Cause Standard value in normal state/Remarks on troubleshooting
Wiring harness between CP01 (female) (16)
– P08 (female) (2), P08 (female) (1) – J03 –
ground (T08)
[Swing LEFT PPC pressure switch system]
Wiring harness between CP01 (female) (9) –
J07 – P25 female (3)
[Pump pressure sensor system]
a
Wiring harness between CP01 (female) (34)
– P01 (female) (2), P01 (female) (1) – J03 –
ground (T08)
[Bucket CURL PPC pressure sensor system]
Wiring harness between CP01 (female) (53)
– P03 (female) (2), P03 (female) (1) – J03 –
ground (T08)
[Swing LEFT PPC pressure sensor system]
Wiring harness between CP01 (female) (73)
– P04 (female) (2), P04 (female) (1) – J03 –
ground (T08)
[Arm IN PPC pressure sensor system]
Wiring harness between CP01 (female) (17)
– P05 (female) (2), P05 (female) (1) – J03 –
ground (T08)
[Bucket DUMP PPC pressure sensor sys-
tem]
Wiring harness between CP01 (female) (16)
– P07 (female) (2), P07 (female) (1) – J03 –
ground (T08)
[Boom RAISE PPC pressure sensor system]
Wiring harness between CP01 (female) (16)
– P08 (female) (2), P08 (female) (1) – J03 –
ground (T08)
[Swing RIGHT PPC pressure sensor system]
Wiring harness between CP01 (female) (9) –
J07 – P25 (female) (3)
[Pump pressure sensor system]
If causes 1 – 3 are not detected, pump controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
40 Troubleshooting
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage Max. 1 V
Voltage Max. 1 V
Voltage Max. 1 V
Voltage Max. 1 V
Voltage Max. 1 V
Voltage Max. 1 V
Voltage Max. 1 V
PC300, 350-8