Komatsu Galeo PC138US-8 Shop Manual page 700

40 Troubleshooting
Trouble (11) Air conditioner abnormality record: Air outlet damper "Abnormality"
• If "CAN disconnection" is displayed as communication condition, communication cannot be carried
Related out normally. Accordingly, this condition is not displayed.
information • Method of reproducing abnormality record: Turn starting switch ON + Turn air conditioner (A/C)
switch ON.
Defective air outlet servo-
1
motor (Internal defect)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Ground fault in wiring har-
Possible causes
3 ness (Short circuit with GND
and standard
circuit)
value in normal
state
Hot short (Short circuit with
4
24V circuit) in wiring harness
Defective air conditioner con-
5
troller
PC138US, USLC-8
Cause Standard value in normal state/Remarks on troubleshooting
Air outlet servomotor may be defective.
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between M
(1) – AC
Wiring harness between M
(3) – AC
Wiring harness between M
(5) – AC
Wiring harness between M
(6) – AC
Wiring harness between M
(7) – AC
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between M
(1) – AC
end
Wiring harness between M
(5) – AC
end
Wiring harness between M
(6) – AC
end
Wiring harness between M
(7) – AC
end
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between M
(1) – AC
end
Wiring harness between M
(5) – AC
end
Wiring harness between M
(6) – AC
end
Wiring harness between M
(7) – AC
end
If causes 1 – 4 are not detected, air conditioner controller may be
defective. (Since trouble is in system, troubleshooting cannot be
carried out.)
ing without turning starting switch ON.
1 (wiring side)
V
(wiring side) (27)
W
1 (wiring side)
V
(wiring side) (3)
W
1 (wiring side)
V
(wiring side) (9)
W
1 (wiring side)
V
(wiring side) (23)
W
1 (wiring side)
V
(wiring side) (24)
W
ing without turning starting switch ON.
1 (wiring side)
V
(wiring side) (27), – circuit branch
W
1 (wiring side)
V
(wiring side) (9), – circuit branch
W
1 (wiring side)
V
(wiring side) (23), – circuit branch
W
1 (wiring side)
V
(wiring side) (24), – circuit branch
W
and carry out troubleshooting.
1 (wiring side)
V
(wiring side) (27), – circuit branch
W
1 (wiring side)
V
(wiring side) (9), – circuit branch
W
1 (wiring side)
V
(wiring side) (23), – circuit branch
W
1 (wiring side)
V
(wiring side) (24), – circuit branch
W
SEN02467-00
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
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
47