Komatsu WA250-6 Shop Manual

SEN03845-00
40-350 10 WA250, 250PZ-6
350 Troubleshooting by failure code (Display of code), Part 5
Failure code [DD1NLD] Fan reverse switch signal: Abnormality
Failure code [DD1NLD] Fan reverse switch signal: Abnormality
Action code Failure code
Trouble
Fan reverse switch signal: Abnormality
(HST controller system)
E01 DD1NLD
Contents of
trouble
• Since the fan manual reverse switch system is shorted with the power source, the fan
manual
reverse switch remains at ON position. (Continuation for 30 seconds determines fault)
Action of
controller
• None in particular.
Problem that
appears on
machine
• Fan remains in the reverse rotation
Related
information
• The input state (ON/OFF) from the fan manual reverse switch can be checked with the monitoring function
(Code: HST – 93400 – FAN REVERSE SW).
(Code: MONITOR PANEL – 40900 – D-IN-1).
• Method of reproducing failure code: Turn the starting switch ON.
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective fan reverse switch
(Internal short circuit)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
L69 (male)
Fan manual reverse
switch
Resistance
Between
(5) – (1), (16)
ON Max. 1 z
OFF Min. 1 Mz
2
Hot short in wiring harness
(Contact with 24V circuit)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between L25 (female) (10) –
L69 (female) (1), (6) and ground
Voltage Max. 1 V
3 Defective machine monitor
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
L25 (male)
Fan manual reverse
switch
Voltage
Between (10) and
ground
ON 20 – 30 V
OFF Max. 1 V

Komatsu WA250-6 Specifications

General

Brand	Komatsu
Model	WA250-6
Category	Compact Loader
Language	English