Komatsu Galeo PC138US-8 Shop Manual page 707

SEN02467-00
Trouble (2) Arm curl operation is not displayed normally by monitoring function.
Related
• Monitoring code: 01900 Pressure switch 1
information
Defective arm curl PPC pres-
1 sure switch (Internal discon-
nection 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
54
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) (17)
– P05 (female) (1)
Wiring harness between P05 (female) (1) –
chassis ground (T08)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between C01 (female) (17)
– P05 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between C01 (female) (17)
– P05 (female) (2)
a Prepare with starting switch OFF, then start engine and carry
Between (17) – chas-
out troubleshooting.
Left work equipment
P05 (male)
control lever
ing without turning starting switch ON.
ing without turning starting switch ON.
and carry out troubleshooting.
out troubleshooting.
Left work equipment
C01 (female)
control lever
sis ground
40 Troubleshooting
Resistance
Neutral Min. 1 Mz
Max. 1 z
Arm curl
Resis-
tance
Resis-
tance
Resis-
tance
Voltage
Resistance
Neutral Min. 1 Mz
Max. 1 z
Arm curl
PC138US, USLC-8
Max. 1 z
Max. 1 z
Min. 1 Mz
Max. 1 V