E-8 Windshield Washer Does Not Operate - Komatsu WA250-6 Shop Manual

SEN03848-00

E-8 Windshield washer does not operate

Contents of
Windshield washer does not operate.
trouble
• Since the windshield washer motor, switch, timer (for only front), or wiring harness is defective, the
Related windshield washer does not operate.
information
• Perform the following troubleshooting when the wiper operates normally. (If the wiper does not oper-
ate normally, carry out troubleshooting for "E-7 Wiper does not operate" first.)
Defective front washer motor
1
(Internal defect)
Defective rear washer motor
2
(Internal defect)
Possible
causes and
standard value
Defective front wiper switch
in normal state
3
(Internal defect)
Defective rear wiper switch
4
(Internal defect)
34
40-400
Causes
a Prepare with starting switch OFF, then hold starting switch OFF or
turn it ON and carry out troubleshooting.
Between (1) – ground
Between (2) – ground
If voltage and resistance are normal but front washer does not oper-
ate, front washer motor is defective.
Between (1) – ground
Between (2) – ground
If voltage and resistance are normal but rear washer does not oper-
ate, rear washer motor is defective.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (7) and (6)
Between (7), (6) and
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (7) and (10)
Between (7), (10) and
400 Troubleshooting of electrical system (E-mode)
E-8 Windshield washer does not operate
Standard value in normal state/Remarks on troubleshooting
B07 Front wiper switch
Window washer
operation position
B06 Rear wiper switch
Window washer
operation position
B07 Front wiper switch
L05
Between (7) and ground
Washer switch for
L05 (male)
front wiper
ground
L05
Between (7) and ground
Washer switch for
L05 (male)
rear wiper
ground
Voltage/Resistance
20 – 30 V
Max. 1 z
Voltage/Resistance
20 – 30 V
Max. 1 z
Voltage/Resistance
Voltage
20 – 30 V
Resistance
ON Max. 1 z
OFF Min. 1 Mz
Constant Min. 1 Mz
Voltage
20 – 30 V
Resistance
ON Max. 1 z
OFF Min. 1 Mz
Constant Min. 1 Mz
WA250, 250PZ-6
1