Failure Code [Dx19Ky] Motor 1 Solenoid: Hot Short - Komatsu WA250-6 Shop Manual

SEN03847-00

Failure code [DX19KY] Motor 1 solenoid: Hot short

Action code Failure code
E03 DX19KY
Contents of
• Hot short was detected in motor 1 solenoid circuit.
trouble
• Turns motor 1 solenoid output OFF.
• Turns HST safety relay output OFF.
Action of
• Turns clutch EPC solenoid 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)
• [DX19KA], [DX20KA] or [DX20KY] may be also displayed, depending on condition when error was
detected.
Defective motor 1 solenoid
1
(Internal defect)
Possible causes
and standard
value in normal
state
Hot short (Contact with 24V
2
circuit) in wiring harness
Defective HST safety relay
3
(L111) (Internal defect)
10
40-370
Motor 1 solenoid: 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.
Between wiring harness T06 (female) (1) –
HST (female) (19)
Wiring harness between T06 (female) (2) –
L111 (female) (3) and ground.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
(Check with traction control OFF and machine stopped.)
Between wiring harness HST (female) (19) –
T06 (female) (1)
• If causes 1 – 2 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 [DX19KY] Motor 1 solenoid: Hot short
Standard value in normal state/Remarks on troubleshooting
T06 (male)
Between (1) – (2)
Between (1), (2) – ground
1
Resistance
15 – 30 z
Min. 1 Mz
Voltage Max. 1 V
Voltage Max. 1 V
Voltage 10 – 15 V
WA250, 250PZ-6