Failure Code [Dlt4Lc] Travel Speed Sensor A & B: Abnormality - Komatsu WA250-6 Shop Manual

SEN03846-00
Failure code [DLT4LC] Travel speed sensor A & B: Abnormality
Action code Failure code
E03 DLT4LC
Contents of
• Difference between values sensed by travel speed sensors A and B during travel is large.
trouble
Action of • Turns the centralized warning lamp and alarm buzzer ON.
controller
• None in particular other than above (Uses higher value normally).
Problem that
appears on
machine
Related
• Even trouble disappears, system does not reset itself until engine is started again.
information
Defective travel speed sen-
1
sor (Internal defect)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
Possible causes
nector)
and standard
value in normal
state
Ground fault in wiring har-
3 ness (Contact with GND cir-
cuit)
Hot short (Contact with 24V
4
circuit) in wiring harness
26
40-360
Travel speed sensor A & B: Abnormality
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then start engine (but do not
travel) and carry out troubleshooting without traveling.
a Prepare with starting switch OFF, then start engine, travel at con-
stant speed, and carry out troubleshooting.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between HST (female) (26) –
T09 (female) (3)
Wiring harness between HST (female) (36) –
T09 (female) (4)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between wiring harness HST (female) (26) –
T09 (female) (3) and ground
Between wiring harness HST (female) (36) –
T09 (female) (4)
a Prepare with starting switch OFF, then start engine, travel at con-
stant speed, and carry out troubleshooting.
Between wiring harness HST (female) (26) –
T09 (female) (3) and ground
Between wiring harness HST (female) (36) –
T09 (female) (4)
360 Troubleshooting by failure code (Display of code), Part 6
Failure code [DLT4LC] Travel speed sensor A & B: Abnormality
Standard value in normal state/Remarks on troubleshooting
T09
Between (1) – (2)
Between (2) – ground
T09
Between (3) – (2)
Between (4) – (2)
Voltage
4.7 – 5.3 V
Max. 1 V
Voltage
Below 1 V – Above 4 V
(Changes at regular intervals)
Below 1 V – Above 4 V
(Changes at regular intervals)
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Below 1 V
– Above
4 V
Voltage
(Changes
at regular
intervals)
Below 1 V
– Above
4 V
Voltage
(Changes
at regular
intervals)
WA250, 250PZ-6