Komatsu Galeo PC138US-8 Shop Manual page 694

40 Troubleshooting
Ground fault in wiring har-
5 ness (Short circuit with GND
circuit)
Possible causes
and standard
value in normal
state
Defective air conditioner con-
6
troller
Defective air conditioner sys-
7
tem
PC138US, USLC-8
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between R20 (female) (3) –
AC
W
Wiring harness between R20 (female) (2) –
M (wiring side) (1)
B
Wiring harness between M
– P
TR
Wiring harness between P
(2) – AC
If causes 1 – 5 are not detected, air conditioner controller may be
defective. (Since trouble is in system, troubleshooting cannot be
carried out.)
If causes 1 – 5 are not detected, air conditioner system may be
defective. See Machine Component Volume of Shop Manual, Air
conditioner, Troubleshooting.
ing without turning starting switch ON.
(wiring side) (36)
(wiring side) (2)
B
(wiring side) (3)
TR
(wiring side) (8)
W
SEN02467-00
Resis-
tance
Resis-
tance
Resis-
tance
(wiring side) Resis-
tance
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
41