Air Conditioner Does Not Work - Komatsu Galeo PC800-8 Shop Manual

SEN00793-02
E-29 Air conditioner does not work
Failure

• Air conditioner does not work.

phenomenon
Relative
information
1 Fuse No. 11 fault
Disconnection of wiring
harness
2
(Disconnection or defec-
tive contact with connector)
Possible causes
and standard
Grounding fault of wiring
value in normal
harness
state
3
(Contact with grounding
(GND) circuit)
Defective air conditioner
4
unit
Circuit diagram related to air conditioner
60
Cause Standard value in normalcy and references for troubleshooting
When fuse is blown, there is a big possibility that grounding fault
occurred in the circuit. (See Cause 3.)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between FB1-11 – M26 (male)
(5)
Wiring harness between M26 (male) (8) – chassis
ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Wiring harness between FB1-11 outlet – M26
(male) (5) and chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the ON position during the troubleshooting.
If the above voltages are normal and the air conditioner does not oper-
ate, the air conditioner unit is defective.
M26
Between (5) – (8)
40 Troubleshooting
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Voltage Min. 1 Mz
Voltage
20 – 30 V
PC800, 850-8