Failure Code [Dw26Ky] Motor 2 Solenoid: Hot Short - Komatsu WA250-6 Shop Manual

SEN03846-00

Failure code [DW26KY] Motor 2 solenoid: Hot short

Action code Failure code
E01 DW26KY
Contents of
• Motor 2 solenoid cannot be operated because of hot short in motor 2 solenoid relay output system.
trouble
Action of • Keeps output to motor 2 solenoid relay turned OFF.
controller
• Even if trouble disappears, system does not reset itself until starting switch is turned OFF.
Problem that
• When the gear is shifted to 3rd, travel speed is not limited and maximum travel speed is equivalent to
appears on
4th-gear speed.
machine
Related
• Output state (ON/OFF) to motor 2 solenoid relay can be checked with monitoring function.
information
(Monitoring code: HST – 40980 – D-OUT-16)
Defective motor 2 solenoid
1
relay (Internal defect)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
2 ness (Contact with GND cir-
cuit)
3 Defective HST controller
32
40-360
Motor 2 solenoid: Hot short
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Replace motor 2
solenoid relay (L103)
with another relay.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between L103 (male) (1) – (2)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between HST (female) (27) –
L103 (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
360 Troubleshooting by failure code (Display of code), Part 6
Failure code [DW26KY] Motor 2 solenoid: Hot short
Standard value in normal state/Remarks on troubleshooting
Condition becomes
normal
Condition does not
become normal
HST
Between (27) – ground
Relay (L103) is
defective
Relay (L103) is
normal
Resis- 200 –
tance 400 z
Voltage
(When Max. 1 V
stopped)
Voltage
Max. 1 V
WA250, 250PZ-6