Travel Alarm Does Not Sound Or Does Not Stop Sounding - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02632-02
E-30 Travel alarm does not sound or does not stop sounding
• Alarm does not sound during travel.
Trouble
• Alarm sounds in stopped state.
Related infor-
—
mation
1 Defective fuse No. 15
2 Defective travel signal
Defective travel alarm
3 (Internal disconnection or
Possible causes
short circuit)
and standard
value in normal
state
Disconnection in wiring har-
ness
4 (Disconnection in wiring or
defective contact in connec-
tor)
Ground fault in wiring har-
ness
5
(Short circuit with GND cir-
cuit)
6 Defective pump controller
62
Cause Standard value in normal state/Remarks on troubleshooting
If fuse is burnt out, the circuit probably has ground fault.
In the case monitoring is not normally indicated, proceed to trouble-
shooting No. E-21.
Monitoring code
When the monitoring display is not correct, proceed to diagnosis for
"'Travel is not normally indicated' in the monitoring function"
a
Between (1) – (2)
If above voltage is normal and travel alarm does not sound, travel
alarm is defective.
a
Wiring harness between F01-15 outlet – J03
– M14 (female) (1)
Wiring harness between M14 (female) (2) –
J01 (19)
a
Wiring harness between F01-15 outlet – J03
– M14 (female) (1) and chassis ground
Since trouble is in system, troubleshooting cannot be carried out. (If
causes 1 – 5 above are not detected, pump controller may be defec-
tive.)
019
Prepare with starting switch OFF, then start engine and carry
out troubleshooting (insert T-adapter).
M14 Travel lever
Neutral
Operated
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
40 Troubleshooting
Item Normal display
Operation of lever:
Travel ON
Lever in neutral: OFF
Voltage
Max. 1 V
20 – 30 V
Resis-
tance
Resis-
tance
Resis-
tance
PC300, 350-8
1
Max. 1 z
Max. 1 z
Min. 1 Mz