Failure Code [Ddk3Kb] Directional Selector Switch: Ground Fault - Komatsu WA250-6 Shop Manual

SEN03845-00

Failure code [DDK3KB] Directional selector switch: Ground fault

Action code Failure code
E03 DDK3KB
Contents of
• Since the directional selector switch input signal system has a ground fault, the directional selector
trouble
switch signal is not recognized.
• Sets to neutral.
Action of
• Turns the centralized warning lamp and alarm buzzer ON.
controller
• Even if cause of failure disappears, system does not reset itself until the directional selector switch is
set to N (Neutral).
• Machine travel with the directional selector switch becomes unavailable.
Problem that
appears on
• Travel with FNR (directional) lever is available.
machine
• Shift lever position pilot lamp goes off.
• Only for right FNR (directional) switch (if equipped)
Related
• Method of reproducing failure code: Turn the starting switch ON, turn the directional selector switch
information
ON/OFF switch ON, then operate the directional selector switch.
Defective directional selec-
tor switch
1
(Internal disconnection or
short circuit)
Possible causes
and standard
Grounding fault in wiring har-
value in normal
2 ness
state
(Contact with ground circuit)
3 Defective HST controller
30
40-350
Failure code [DDK3KB] Directional selector switch: Ground fault
Directional selector switch: Ground fault
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (1) – (2)
Between (1) – (3)
Between (1) – (4)
Between (1), (2), (3),
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between HST (female) (4) –
L62 (female) (2), L68 (female) (2) and
ground
Wiring harness between HST (female) (14) –
L62 (female) (3), D01 (female) (2) and
ground
Wiring harness between HST (female) (24) –
L62 (female) (4) and ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
(Test with turning on the directional selector ON/OFF switch)
Between (4) and
Between (14) and
Between (24) and
350 Troubleshooting by failure code (Display of code), Part 5
Standard value in normal state/Remarks on troubleshooting
Right FNR (direc-
L15 (male)
tional) switch
F (Forward)
Other than above
N (Neutral)
Other than above
R (Reverse)
Other than above
(4) and ground
Right FNR (direc-
HST
tional) switch
F (Forward)
ground
Other than above
N (Neutral)
ground
Other than above
R (Reverse)
ground
Other than above
Resistance
Max. 1 z
Min. 1 Mz
Max. 1 z
Min. 1 Mz
Max. 1 z
Min. 1 Mz
Constant Min. 1 Mz
Resis-
tance
Resis-
tance
Resis-
tance
Voltage
Max. 1 V
20 – 30 V
Max. 1 V
20 – 30 V
Max. 1 V
20 – 30 V
WA250, 250PZ-6
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz