Failure Code [Dds5L6] Steering: Low Oil Pressure (Operation Of Emergency Steering) - Komatsu WA250-6 Shop Manual

SEN03845-00
Failure code [DDS5L6] Steering: Low oil pressure (Operation of
emergency steering)
Action code Failure code
E03 DDS5L6
Contents of
• While engine was running, steering oil pressure sensor signal was "closed".
trouble
Action of • Turns the centralized warning lamp and alarm buzzer ON.
machine monitor
• Turns steering oil pressure warning lamp ON.
Problem that
appears on • Steering system does not work except when HST circuit oil pressure is high during travel etc.
machine
Related
• This code is applied to only machine with emergency steering (optional).
information
1 Low steering oil pressure
Defective steering oil pres-
2 sure sensor (switch) (Internal
defect)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
3 ness (Contact with GND cir-
cuit)
4 Defective machine monitor
38
40-350

Failure code [DDS5L6] Steering: Low oil pressure (Operation of emergency steering)

Steering: Low oil pressure (Operation of emergency steering)
Trouble
(Machine monitor system)
Causes
System is normal.
a Carry out troubleshooting for hydraulic and mechanical systems.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (1) – (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between wiring harness L27 (female) (16) –
F11 (female) (1) and ground
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
350 Troubleshooting by failure code (Display of code), Part 5
Standard value in normal state/Remarks on troubleshooting
F11 (male) Steering oil pressure
When oil pressure is
(While engine is
When oil pressure is
(While engine is
L27 Steering oil pressure
When oil pressure is
abnormal (low) (below
0.5 MPa {5.1 kg/cm
Between (16) –
ground
When oil pressure is
normal (above 0.9
MPa {9.2 kg/cm
Resistance
low
Max. 1 z
stopped)
normal
Min. 1 Mz
running)
Resis-
tance
Voltage
Max. 1 V
})
2
20 – 30 V
})
2
WA250, 250PZ-6
Min.
1 Mz