Failure Code [Dxh8Kz] Forward Solenoid: Disconnection/Hot Short - Komatsu WA250-6 Shop Manual

SEN03847-00

Failure code [DXH8KZ] Forward solenoid: Disconnection/Hot short

Action code Failure code
E03 DXH8KZ
• Forward solenoid is not turned ON (HST pressure selector relay does not operate) (when there is
Contents of
disconnection).
trouble
• Forward solenoid cannot be turned OFF (Where there is hot short).
Action of • Turns output to forward solenoid OFF.
controller
• Turns the centralized warning lamp and alarm buzzer ON.
• Machine does not travel forward (when there is disconnection).
Problem that
appears on
• Machine may start forward suddenly (when there is hot short).
machine
• Gear is not set in neutral (when there is hot short).
• Output state to HST pump F (Forward) solenoid of HST controller can be checked with monitoring
Related
function.
information
(Monitoring code: HST – 40980 – D-OUT-18)
Defective forward solenoid
1
(Internal defect)
Defective diode
2
(Internal defect)
Possible causes
Disconnection in wiring har-
and standard
ness (Disconnection in wiring
3
value in normal
or defective contact in con-
state
nector)
Hot short (Contact with 24V
4
circuit) in wiring harness
5 Defective HST controller
24
40-370
Failure code [DXH8KZ] Forward solenoid: Disconnection/Hot short
Forward solenoid: Disconnection/Hot short
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
(See Testing and adjusting, "Test procedure for diode".)
Between T01A (male) (1) – (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between HST (female) (10) –
T01 (female) (1)
Wiring harness between T01 (female) (2) –
ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between wiring harness HST (female) (10) –
T01 (female) (1) and ground
a Prepare with starting switch OFF, then start engine and release
parking brake, and carry out troubleshooting.
370 Troubleshooting by failure code (Display of code), Part 7
Standard value in normal state/Remarks on troubleshooting
T01 (male)
Between (1) – (2)
Between (1), (2) – ground
Directional lever
HST
Between (10) –
ground
Other than above
Resistance
15 – 30 z
Min. 1 Mz
No continuity
Resis-
tance
Resis-
tance
Voltage
Voltage
position
F (Foward) 20 – 30 V
Max. 1 V
WA250, 250PZ-6
1
Max. 1 z
Max. 1 z
Max. 1 V