Komatsu Galeo PC138US-8 Shop Manual page 713

SEN02467-00
Trouble (5) Boom lower operation is not displayed normally by monitoring function.
Related
• Monitoring code: 01900 Pressure switch 1
information
Defective boom lower PPC
1 pressure switch (Internal dis-
connection or short circuit)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Possible causes
and standard
value in normal
Ground fault in wiring har-
state
3 ness (Short circuit with GND
circuit)
Hot short (Short circuit with
4
24V circuit) in wiring harness
5 Defective pump controller
60
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then start engine and carry
Between (1) – (2)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between C01 (female) (14)
– P06 (female) (2)
Wiring harness between P06 (female) (1) –
chassis ground (T08)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between C01 (female) (14)
– P06 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between C01 (female) (14)
– P06 (female) (2)
a Prepare with starting switch OFF, then start engine and carry
Between (14) – chas-
out troubleshooting.
Right work equip-
P06 (male)
ment control lever
Boom lower
ing without turning starting switch ON.
ing without turning starting switch ON.
and carry out troubleshooting.
out troubleshooting.
Right work equip-
C01 (female)
ment control lever
sis ground
Boom lower
40 Troubleshooting
Resistance
Neutral Min. 1 Mz
Max. 1 z
Resis-
tance
Resis-
tance
Resis-
tance
Voltage
Resistance
Neutral Min. 1 Mz
Max. 1 z
PC138US, USLC-8
Max. 1 z
Max. 1 z
Min. 1 Mz
Max. 1 V