E-14 Backup Alarm Does Not Sound Or It Keeps Sounding - Komatsu WA250-6 Shop Manual

400 Troubleshooting of electrical system (E-mode)

E-14 Backup alarm does not sound or it keeps sounding

E-14 Backup alarm does not sound or it keeps sounding
Contents of
Backup alarm does not sound or it keeps sounding.
trouble
• The machine monitor monitors the primary circuit of the backup lamp relay for a trouble.
Related (If hot short occurs in the primary side of the back lamp relay, failure code [D160KY] is indicated. In
information such case, give precedence to the troubleshooting of the failure indicated with the code.)
• If another failure code is displayed, carry out troubleshooting for it first.
Defective backup alarm
1
(Internal trouble)
Defective fuse No.14 of fuse
2
box (FS2)
Defective backup lamp 1 relay
3
(L109) (Internal trouble)
Possible
causes and
standard value
in normal state
Defective backup lamp 2 relay
4 (L126) (Internal disconnection
or short circuit)
Defective FR pressure select
5
relay (L109) (Internal trouble)
WA250, 250PZ-6
Causes
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between (1) and (2)
If the fuse is burn, the circuit probably has a grounding fault, etc.
(See cause 7.)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
When backup lamp 1 relay (L109) is replaced with a relay of the
same type, if the condition becomes normal, the backup lamp 1
relay is defective.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
When backup lamp 2 relay (L126) is replaced with a relay of the
same type, if the condition becomes normal, the backup lamp 2
relay is defective.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
When FR pressure select relay (L101) is replaced with a relay of the
same type, if the condition becomes normal, the FR pressure select
relay is defective.
Standard value in normal state/Remarks on troubleshooting
B03 Gear shift lever
Other than R
L109 (male)
Between (1) and (2)
L126 (male)
Between (1) and (2)
L101 (male)
Between (1) and (2)
SEN03848-00
Voltage
R 20 – 30 V
Max. 1 V
Resistance
200 – 400 z
Resistance
200 – 400 z
Resistance
200 – 400 z
40-400
1
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