Failure Code [Dx20Ka] Clutch Epc Solenoid: Disconnection - Komatsu WA250-6 Shop Manual

SEN03847-00

Failure code [DX20KA] Clutch EPC solenoid: Disconnection

Action code Failure code
E03 DX20KA
• Disconnection was detected in clutch EPC solenoid circuit.
Contents of
(When output command was above 250 mA, difference between command value and sensed cur-
trouble
rent exceeded 200 mA.)
• Turns clutch EPC solenoid output OFF.
• Turns motor 1 solenoid output OFF.
Action of
• Turns HST safety relay output OFF.
controller
• Even if trouble disappears, system does not reset itself until starting switch is turned OFF.
• Turns the centralized warning lamp and alarm buzzer ON.
• Traction force is decreased.
Problem that
• Travel speed is not limited with speed range selector switch and travel speed control dial.
appears on
• If engine is stopped without applying parking brake securely on slope, machine moves down sud-
machine
denly.
• Following output command values can be checked with monitoring function.
Motor 1 solenoid output: HST – 80000 – MOTOR SOL DIR (mA)
Related
HST safety relay output: HST – 40979 – D_OUT_15 (ON/OFF)
information
Clutch EPC solenoid output: HST – 80100 – CLUTCH SOL DIR (mA)
• If failure code [DX19KY] or [DX20KY] is also displayed, carry out troubleshooting for it first.
Defective clutch EPC sole-
1
noid (Internal defect)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Possible causes
and standard
value in normal
state
Defective HST safety relay
3
(L111) (Internal defect)
4 Defective HST controller
12
40-370
Clutch EPC solenoid: Disconnection
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.
Wiring harness between HST (female) (9) –
T05 (female) (1)
Wiring harness between T05 (female) (2) –
L111 (female) (3)
Wiring harness between L111 (female) (5) –
HST (female) (40)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Replace HST safety
relay (L111) with
another relay
a Prepare with starting switch OFF and check safety relay unit.
Between L111 (male)
• If causes 1 – 3 are not detected, HST controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
370 Troubleshooting by failure code (Display of code), Part 7
Failure code [DX20KA] Clutch EPC solenoid: Disconnection
Standard value in normal state/Remarks on troubleshooting
T05 (male)
Between (1) – (2)
Between (1), (2) – ground
Condition becomes
normal
Condition does not
become normal
Apply 24 V between
(1) – (2).
(3) – (5)
Apply no voltage
between (1) – (2).
1
Resistance
5 – 15 z
Min. 1 Mz
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Relay (L111) is
defective
Relay (L111) is
normal
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
WA250, 250PZ-6