Failure Code [D1B0Ky] Hst Safety Relay: Hot Short - Komatsu WA250-6 Shop Manual

SEN03844-00

Failure code [D1B0KY] HST safety relay: Hot short

Action code Failure code
E03 D1B0KY
Contents of
• Hot short was detected in HST safety relay circuit.
trouble
• Turns clutch EPC solenoid output OFF.
• Turns motor 1 solenoid output OFF.
Action of
• Turns HST safety relay output OFF.
machine monitor
• 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 decreases.
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.
• If [DAJ2L3] or [DAJ2L4] is displayed, carry out troubleshooting for it first.
• Following output command values can be checked with monitoring function.
Related
Motor 1 solenoid output: HST – 80000 – MOTOR SOL DIR (mA)
information
HST safety relay output: HST – 40979 – D_OUT_15 (ON/OFF)
Clutch EPC solenoid output: HST – 80100 – CLUTCH SOL DIR (mA).
Defective HST safety relay
1
(Internal defect)
Possible causes
and standard
value in normal
state
Hot short (Contact with 24V
2
circuit) in wiring harness
3 Defective HST controller
10
40-340
HST safety relay: Hot short
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
Replace HST safety
relay (L111) with
another relay.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between L111 (male) (1) – (2)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between wiring harness HST (female) (17) –
L111 (female) (2) and ground
If causes 1 and 2 are not detected, HST controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
340 Troubleshooting by failure code (Display of code), Part 4
Failure code [D1B0KY] HST safety relay: Hot short
Standard value in normal state/Remarks on troubleshooting
Condition becomes
normal.
Condition does not
become normal.
Relay (L111) is
defective.
Relay (L111) is
normal.
Resis- 200 – 400
tance z
Voltage Max. 1 V
WA250, 250PZ-6