Failure Code [Dv20Kb] Travel Alarm S/C - Komatsu Galeo PC138US-8 Shop Manual

40 Troubleshooting

Failure code [DV20KB] Travel alarm S/C

User code Failure code
— DV20KB
Contents of
• Abnormal current flowed in the travel alarm circuit, when power is supplied to the circuit.
trouble
• Power to the travel alarm circuit is switched OFF.
Action of
• Even after the failure cause disappears of itself, the machine operation does not return to normalcy,
controller
unless the engine starting switch is once turned OFF.
Problem that
appears on • The travel alarm does not sound.
machine
Related • Operation of the travel alarm (ON or OFF) can be checked in the monitoring function.
information (Code: 03701 Controller output 2)
Travel alarm defective
1
(Internal defect)
Possible causes
and standard
Grounding fault of wiring har-
value in normal
ness
state
2
(Contact with grounding cir-
cuit)
3 Pump controller defective
Circuit diagram related
PC138US, USLC-8
Travel alarm S/C
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a Turn the engine starting switch OFF for the preparations, and
Between (1) and (2)
If the above voltage is normal but the travel alarm does not oper-
ate, the travel alarm is defective.
a Turn the engine starting switch OFF for the preparations, and
Between wiring harness between C02
(female) (107) and M14 (female) (1) and
grounding
a Turn the engine starting switch OFF for the preparations, and
Between (107) –
chassis ground
keep the engine running during the troubleshooting.
M14 (female) Travel lever
Operated
hold it in the OFF position during the troubleshooting.
keep the engine running during the troubleshooting.
C02 Travel lever
Operated
SEN02465-01
Voltage
Neutral Max. 1 V
20 – 30 V
Resis-
tance
Voltage
Neutral Max. 1 V
20 – 30 V
1
Min. 1 Mz
29