Komatsu PC200-8M0, Shop Manual, Page: 776 / 1254

305 Troubleshooting by failure code, Part 5
Failure code [DWA2KA] Attachment Sol Open Circuit
40-305
4
PC200, 200LC, 220, 220LC-8M0
SEN06137-00
Failure code [DWA2KA] Attachment Sol Open Circuit
Action
level
Failure code
Failure
Attachment Single/multiple selector Solenoid Open Circuit
(Pump controller system)
L03 DWA2KA
Detail of failure
q
Controller output voltage to ATT return selector solenoid exceeds standard value when it stops out-
putting drive current to ATT return selector solenoid.
Action of con-
troller
q
None in particular (Since no current flows, solenoid is not energized.)
q
If cause of failure disappears, machine becomes normal by itself.
Problem on
machine
q
Attachment return circuit does not change to 1-way circuit.
Related infor-
mation
q
Controller's command (ON/OFF) to attachment return selector solenoid can be checked with mon-
itoring function. (If controller sends solenoid ON command, monitoring display is ON even if sole-
noid is not switched ON due to open circuit.) (Code: 02301 Solenoid 2)
q
Method of reproducing failure code: Turn starting switch to ON position and set machine in working
mode other than breaker mode (B).
Cause Procedure, measuring location, criteria and remarks
1
Defective attachment return selec-
tor solenoid (internal open circuit)
1. Turn starting switch to OFF position.
2. Disconnect connector V06, and connect T-adapters to male side.
Between V06 (male) (1) and (2) Resistance 20 to 60
z
2
Open circuit or ground fault in wir-
ing harness
1. Turn starting switch to OFF position.
2. Disconnect connector C02 and connect T-adapters to female side.
Between C02 (female) (86) and ground Resistance 20 to 60
z
3
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
a
If no failure is found in checks on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and V06, and connect T-adapters to each
female side.
Between C02 (female) (86) and V06 (female) (1) Resistance Max. 1
z
Between V06 (female) (2) and ground Resistance Max. 1
z
4 Defective pump controller
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)