Failure Code [Ddk6Ky] Fnr Lever: Hot Short - Komatsu WA250-6 Shop Manual

SEN03845-00

Failure code [DDK6KY] FNR lever: Hot short

Action code Failure code
E03 DDK6KY
Contents of
• Multiple FNR (directional) lever signals are input because of hot short in FNR (directional) lever
trouble
switch signal system.
• Sets gear in neutral.
• Turns the centralized warning lamp and alarm buzzer ON.
Action of
• If directional selector switch actuation switch is turned ON, machine is driven according to directional
controller
selector switch setting (only machine with directional selector switch actuation switch).
• Even if trouble disappears, system does not reset itself until FNR (directional) lever is set in N (Neu-
tral).
• Operator cannot travel machine at position other than position having hot short with FNR (directional)
lever switch. (Example: When directional lever F system has hot short, if lever is set in F, trouble is
Problem that
reset and machine can travel forward.)
appears on
machine
• Multiple gear shift lever position lamp lights.
• Machine can be driven with directional selector switch (only machine with directional selector switch).
• The input state (ON/OFF) from the FNR (directional) lever switch can be checked with the monitoring
Related
function (Code: HST – 40977 – D-IN-0, D-IN-1 or D-IN-2).
information
• Method of reproducing failure code: Turn the starting switch ON and operate FNR (directional) lever
Defective FNR (directional)
1 lever switch (Internal short
circuit)
Possible causes
and standard
value in normal
Hot short in wiring harness
state
2
(Contact with 24V circuit)
3 Defective HST controller
36
40-350
FNR lever: Hot short
Trouble
(HST controller system)
Causes
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between (1) and
Between (3) and
Between (2) and
Between (4) and
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between HST (female) (15) –
L15 (female) (4) and ground
Wiring harness between HST (female) (5) –
L15 (female) (3) and ground
Wiring harness between HST (female) (34) –
L15 (female) (2) and ground
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between (5) and
Between (34) and
Between (15) and
350 Troubleshooting by failure code (Display of code), Part 5
Failure code [DDK6KY] FNR lever: Hot short
Standard value in normal state/Remarks on troubleshooting
FNR (directional)
L15
ground
F (Forward)
ground
Other than above
N (Neutral)
ground
Other than above
R (Reverse)
ground
Other than above
FNR (directional)
HST
N (Neutral)
ground
Other than above
F (Forward)
ground
Other than above
R (Reverse)
ground
Other than above
Voltage
lever
Constant 20 – 30 V
20 – 30 V
Max. 1 V
20 – 30 V
Max. 1 V
20 – 30 V
Max. 1 V
Voltage
Voltage
Voltage
Voltage
lever
20 – 30 V
Max. 1 V
20 – 30 V
Max. 1 V
20 – 30 V
Max. 1 V
WA250, 250PZ-6
Max. 1 V
Max. 1 V
Max. 1 V