Failure Code [Dy20Ka] Wiper Working Abnormality - Komatsu Galeo PC138US-8 Shop Manual

SEN02466-00

Failure code [DY20KA] Wiper working abnormality

User code Failure code
— DY20KA
Contents of
• When windshield wiper works, W signal of working ends is not input.
trouble
Action of • Turns working output to wiper motor OFF.
controller • If cause of failure disappears, system resets itself.
Problem that
appears on • Wiper motor does not work.
machine
• Condition of W contact signal of wiper working area can be checked with monitoring function.
Related
(Code: 02204 Switch input 5)
information
• Method of reproducing failure code: Turn starting switch ON + Set wiper switch to INT or ON.
Defective wiper motor (Inter-
1
nal disconnection)
Possible causes
Disconnection in wiring har-
and standard
ness (Disconnection in wiring
value in normal
2
or defective contact in con-
state
nector)
3 Defective pump controller
8
Wiper working abnormality
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (6) – (5)
Between (1) – (3)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between C01 (female) (56)
– M05 (male) (6)
Wiring harness between M05 (female) (5) –
J01 – chassis ground (T09)
Wiring harness between C02 (female) (114)
– M05 (male) (1)
Wiring harness between C02 (female) (119)
– M05 (male) (3)
a Prepare with starting switch OFF, then carry out troubleshoot-
Between (56) – chas-
Between (114) – (119)
ing without turning starting switch ON.
M05 (female) Wiper blade
Operating range top
Other than operating
range top
ing without turning starting switch ON.
ing without turning starting switch ON.
C01 (female) Wiper blade
Operating range top
Other than operating
sis ground
range top
40 Troubleshooting
Resistance
Max. 1 z
Min. 1 Mz
Max. 20 z
All range
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resistance
Max. 1 z
Min. 1 Mz
Max. 20 z
All range
PC138US, USLC-8
1
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z