Failure Code [Dxh7Kb] Reverse Solenoid: Ground Fault - Komatsu WA250-6 Shop Manual

SEN03847-00

Failure code [DXH7KB] Reverse solenoid: Ground fault

Action code Failure code
E03 DXH7KB
Contents of
• Reverse solenoid is not turned ON.
trouble
Action of • Turns output to reverse solenoid OFF.
controller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
appears on
• Machine does not travel in reverse.
machine
• Output state to HST pump R (Reverse) solenoid of HST controller can be checked with monitoring
Related
function.
information
(Monitoring code: HST – 40980 – D-OUT-19)
Defective reverse solenoid
1
(Internal defect)
Defective diode
2
(Internal defect)
Possible causes
and standard
Defective FR pressure select
value in normal
3
relay (Internal defect)
state
Ground fault in wiring har-
4 ness (Contact with GND cir-
cuit)
5 Defective HST controller
18
40-370
Reverse solenoid: Ground fault
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 T01B (male) (1) – (2)
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
Replace FR pressure
select relay (L101)
with another relay
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between L101 (male) (5) – (6)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between wiring harness HST (female) (20) –
T01 (female) (3) and ground
a Prepare with starting switch OFF, then start engine, release park-
ing brake, set directional lever in R position, and carry out trouble-
shooting.
370 Troubleshooting by failure code (Display of code), Part 7
Failure code [DXH7KB] Reverse solenoid: Ground fault
Standard value in normal state/Remarks on troubleshooting
T01 (male)
Between (3) – (4)
Between (3), (4) – ground
Condition becomes
normal
Condition does not
become normal
HST
Between (20) – ground
1
Resistance
15 – 30 z
Min. 1 Mz
No continuity
Relay (L101) is
defective
Relay (L101) is
normal
Resis- 200 –
tance 400 z
Resis-
Min. 1 Mz
tance
Voltage
20 – 30 V
WA250, 250PZ-6