Failure Code [Dv20Kb] Travel Alarm Short Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [DV20KB] Travel Alarm Short Circuit

Action level Failure code
L01 DV20KB
Detail of
Abnormal current flows when pump controller drives travel alarm circuit.
failure
Stops driving travel alarm circuit.
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
controller
is set to OFF position.
Problem on
Travel alarm does not sound.
machine
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot
Related
be measured at pump controller connector.
information
(2 persons are required for this check.)
No. Cause
Defective travel alarm
1
(Internal defect)
Ground fault in wiring
harness
2
(Contact with ground
circuit)
Pump controller is
3
defective.
PC88MR-10
Travel Alarm Short Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector M14, and connect T-adapter to female side.
3. Turn starting switch to ON position.
4. Perform troubleshooting by operating the travel lever.
Never enter under the machine when operating travel lever.
a If voltage is normal but travel alarm does not sound, travel alarm is
defective.
Voltage Between M14 (female) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connectors CP02 and M14, and connect T-adapter to either
female side.
Between CP02 (female) (107) and ground, or M14
Resistance
(female) (1) and ground
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector M14.
3. Turn starting switch to ON position.
4. Perform troubleshooting by operating the travel lever.
Never enter under the machine when operating travel lever.
Voltage Between M14 (1) and (2)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-DV20KB-400-A-Z0-A)
NEUTRAL
Depressed
NEUTRAL
Depressed
Travel
control
lever:
Max. 1 V
At
Travel
control
20 to 30 V
lever:
Min. 1 Mz
Travel
control
lever:
Max. 1 V
At
Travel
control
20 to 30 V
lever:
40-331