Komatsu Galeo PC138US-8 Shop Manual page 699

SEN02467-00
Trouble (10) Air conditioner abnormality record: Daylight sensor "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 daylight sensor
1
(Internal defect)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Possible causes
Ground fault in wiring har-
and standard
3 ness (Short circuit with GND
value in normal
circuit)
state
Hot short (Short circuit with
4
24V circuit) in wiring harness
Defective air conditioner con-
5
troller
46
Cause Standard value in normal state/Remarks on troubleshooting
Daylight sensor may be defective.
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between AC
(36) – P31 (female) (1)
Wiring harness between AC
(15) – P31 (female) (2)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between AC
(3) – P31 (female) (1), – circuit branch end
Wiring harness between AC
(15) – P31 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between AC
(3) – P31 (female) (1), – circuit branch end
Wiring harness between AC
(15) – P31 (female) (2)
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.
W
W
ing without turning starting switch ON.
W
W
and carry out troubleshooting.
W
W
40 Troubleshooting
(wiring side) Resis-
tance
(wiring side) Resis-
tance
(wiring side) Resis-
tance
(wiring side) Resis-
tance
(wiring side)
Voltage Max. 1 V
(wiring side)
Voltage Max. 1 V
PC138US, USLC-8
Max. 1 z
Max. 1 z
Min. 1 Mz
Min. 1 Mz