Komatsu Galeo PC138US-8 Shop Manual page 696

40 Troubleshooting
(5) Air conditioner abnormality record: Communication condition "CAN disconnection", Communica-
Trouble
tion condition "Abnormal"
• While abnormality in communication is being detected, "CAN disconnection" is displayed.
• If abnormality in communication has been detected and reset, "Abnormality" is displayed.
Related
• If "CAN disconnection" is displayed as communication condition, communication cannot be carried
information
out normally. Accordingly, condition of other items is not displayed.
• Method of reproducing abnormality record: Turn starting switch ON.
Disconnection in wiring har-
ness (Disconnection in wiring
1
or defective contact in con-
nector)
Ground fault in wiring har-
2 ness (Short circuit with GND
circuit)
Possible causes
and standard
value in normal
state
Hot short (Short circuit with
3
24V circuit) in wiring harness
Defective CAN terminal
4 resistance (Internal short cir-
cuit or disconnection)
Defective air conditioner con-
5
troller
6 Defective machine monitor
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 N10 (female) (1) –
CM02 (female) (8), (9)
Wiring harness between N10 (female) (2) –
CM02 (female) (10)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between N10 (male) (1) –
CM02 (female) (8), (9), – C01 (female) (45),
– CE02 (female) (1), – K02 (female) (A), –
N08 (male) (3)
Wiring harness between N10 (female) (2) –
CM02 (female) (10), – C01 (female) (64), –
CE02 (female) (21), – K02 (female) (B), –
N08 (male) (10)
a Prepare with starting switch OFF, then turn starting switch ON
N10 (male) (1) – CM02 (female) (8), (9), –
C01 (female) (45), – CE02 (female) (1), –
K02 (female) (A), – N08 (male) (3)
Wiring harness between N10 (female) (2) –
CM02 (female) (10), – C01 (female) (64), –
CE02 (female) (21), – K02 (female) (B), –
N08 (male) (10)
a Prepare with starting switch OFF, then carry out troubleshoot-
If causes 1 – 4 are not detected, air conditioner controller may be
defective. (Since trouble is in system, troubleshooting cannot be
carried out.)
If causes 1 – 4 are not detected, machine monitor may be defec-
tive. (Since trouble is in system, troubleshooting cannot be carried
out.)
ing without turning starting switch ON.
ing without turning starting switch ON.
and carry out troubleshooting.
ing without turning starting switch ON.
K02 (male)
Between (A) – (B)
SEN02467-00
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage Max. 5.5 V
Voltage Max. 5.5 V
Resistance
47 – 67 z
43