Failure Code [Dde5Ma] Emergency Steering Operation Switch: Disconnection - Komatsu WA250-6 Shop Manual

SEN03845-00
Failure code [DDE5MA] Emergency steering operation switch:
Disconnection
Action code Failure code
E01 DDE5MA
Contents of
• While engine was stopped, steering pump oil pressure was sensed because of disconnection in
trouble
steering oil pressure reduction switch (emergency steering operation switch) system.
Action of
• None in particular.
machine monitor
Problem that
appears on
• When steering oil pressure reduces, steering oil pressure caution lamp does not light.
machine
• This code is applied to only emergency steering specification model and is not turned ON if not
selected as option with machine monitor.
Related
• Input state (ON/OFF) from steering oil pressure reduction switch can be checked with monitoring
information
function.
(Monitoring code: MONITOR PANEL – 40904 – D-IN-39)
Defective steering oil pres-
1 sure reduction switch (Inter-
nal defect)
Possible causes
and standard
Disconnection in wiring har-
value in normal
ness (Disconnection in wiring
state
2
or defective contact in con-
nector)
3 Defective machine monitor
26
40-350

Failure code [DDE5MA] Emergency steering operation switch: Disconnection

Emergency steering operation switch: Disconnection
Trouble
(Machine monitor system)
Causes
a Prepare with starting switch OFF, then turn starting switch ON
and start engine and carry out troubleshooting in each case.
Between (1) – (2)
Between (1), (2) –
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between L27 (female) (16) –
F11 (female) (1)
Between F11 (female) (2) – ground
a Prepare with starting switch OFF, then turn starting switch ON
and start engine and carry out troubleshooting in each case.
350 Troubleshooting by failure code (Display of code), Part 5
Standard value in normal state/Remarks on troubleshooting
F11 (male) Steering oil pressure
Oil pressure reduction
(Engine is stopped)
Oil pressure normal
(Engine is running)
ground
L27 Steering oil pressure
Oil pressure reduction
(Engine is stopped)
Between (16) –
ground
Oil pressure normal
(Engine is running)
Resistance
Max. 1 z
Min. 1 Mz
Normally Min. 1 Mz
Resis-
tance
Resis-
tance
Voltage
Max. 1 V
20 – 30 V
WA250, 250PZ-6
Max. 1 z
Max. 1 z