Komatsu WA250-6 Shop Manual

SEN03845-00
40-350 24 WA250, 250PZ-6
350 Troubleshooting by failure code (Display of code), Part 5
Failure code [DDD7KY] Travel speed control dial signal: Hot short
Failure code [DDD7KY] Travel speed control dial signal: Hot short
Action code Failure code
Trouble
Travel speed control dial signal: Hot short
(HST controller system)
E01 DDD7KY
Contents of
trouble
• Travel speed control dial signal voltage exceeded 4.7 V.
Action of
controller
• None in particular.
Problem that
appears on
machine
• Travel speed cannot be adjusted with travel speed control dial.
• If speed range selector switch is set in 1st, travel speed is set to about 4 km/h.
Related
information
• If failure code [DAJ5KX] is also displayed, carry out troubleshooting for it first.
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective travel speed con-
trol dial (Internal defect)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between L54 (female) (A) – (C) Voltage
4.7 – 5.3
V
Between L54 (female) (B) – (C) (Max. speed
side of dial)
Voltage
0.3 – 0.9
V
Between L54 (female) (B) – (C) (Min. speed
side of dial)
Voltage
4.1 – 4.7
V
2
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between HST (female) (32) –
L54 (female) (C)
Resis-
tance
Max. 1 z
3
Hot short (Contact with 24V
circuit) in wiring harness
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between wiring harness HST (female) (23) –
L54 (female) (B) and ground
Voltage Max. 1 V
4 Defective HST controller
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
HST (female) Resistance
Between (32) – ground Max. 1 z
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
HST (female) Voltage
Between (22) – ground 4.7 – 5.3 V
Between (23) – ground 0.3 – 4.7 V

Komatsu WA250-6 Specifications

General

Brand	Komatsu
Model	WA250-6
Category	Compact Loader
Language	English