Failure Code [Dy2Dkb] Wiper Drive (For) S/C - Komatsu Galeo PC800-8 Shop Manual

SEN00792-02

Failure code [DY2DKB] Wiper Drive (For) S/C

Double-wiper specification
Action code Failure code
— DY2DKB
Contents of
• Abnormal current flowed at output to wiper motor (for) circuit.
trouble
Action of
• Turns output to wiper motor (for) circuit OFF.
controller
Problem that
appears on • Wiper operation stops.
machine
Related
information
Upper wiper motor
defective
1
(Internal short-circuiting or
grounding fault)
Lower wiper motor
defective
2
(Internal short-circuiting or
grounding fault)
Assembled-type diode D04
3 defective
(Internal short-circuiting)
Possible causes
and standard
value in normal
state
Grounding fault of wiring
harness
4
(Contact with grounding cir-
cuit)
Machine monitor defective
(Upper wiper motor)
5
Machine monitor defective
(Lower wiper motor)
NOTE: When the upper wiper and lower wiper are operated simultaneously: Max. 3 V
intervals)
66
Wiper Drive (For) S/C
Trouble
(Machine monitor system)
Cause Standard value in normal state/Remarks on troubleshooting
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between (3) – chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between (3) – chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
Between wiring harness between CM01
(female) (9) – M05 (male) (3) – D04 (female) (1)
and chassis ground
Between wiring harness between CM01
(female) (10) – J02 – M15 (male) (3) – D04
(female) (2) and chassis ground
aTurn the engine starting switch OFF for the preparations, and hold it in
the ON position during the troubleshooting.
Between (9) – chassis
aTurn the engine starting switch OFF for the preparations, and hold it in
the ON position during the troubleshooting.
Between (10) – chassis
M05 (female)
Between (3) – (1)
M15 (female)
Between (3) – (1)
D04 (male)
Between (3) – (7)
Between (4) – (8)
P01 Upper wiper switch
OFF
ground
P01 Lower wiper switch
OFF
ground
40 Troubleshooting
Continuity and resistance
Continued
Min. 1 Mz
Continuity and resistance value
Continued
Min. 1 Mz
Resistance (Continuitiy)
Min. 1 Mz (No continuitiy)
Min. 1 Mz (No continuitiy)
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Voltage
Max. 3 V
ON 20 – 30 V (Note)
Voltage
Max. 3 V
ON 20 – 30 V (Note)
20 – 30 V (at regular
PC800, 850-8