Failure Code [Dwa2Kb] Attachment Sol Short Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

40 Troubleshooting

Failure code [DWA2KB] Attachment Sol Short Circuit

User code Failure code
— DWA2KB
Contents of
• When output to service solenoid is turned ON, short circuit was detected in circuit.
trouble
Action of • Turns output to service solenoid OFF
controller • Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on • Hydraulic circuit for attachment is not does not change to single operation circuit.
machine
• Operating condition of service solenoid can be checked with monitoring function.
Related infor-
(Code: 02301 Solenoid 2)
mation
• Method of reproducing failure code: Turn starting switch ON + Set machine in breaker mode (B).
Defective service solenoid
1 (Internal short circuit or
ground fault)
Possible causes
and standard
Ground fault in wiring har-
value in normal
2 ness (Short circuit with GND
state
circuit)
3 Defective pump controller
Circuit diagram related to service solenoid
PC300, 350-8
Attachment solenoid short circuit
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (1) – chassis ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between CP02 (female) (86)
– V07 (female) (1)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (86) – chassis ground
V07 (male)
Between (1) – (2)
CP02 (female)
SEN02631-02
1
Resistance
20 – 60 z
Min. 1 Mz
Resis-
Min. 1 Mz
tance
Resistance
20 – 60 z
33