Failure Code [Dwk0Ka] 2-Stage Relief Sol Open Circuit - Komatsu PC200-8M0 Shop Manual

SEN06137-00

Failure code [DWK0KA] 2-stage Relief Sol Open Circuit

Action
Failure code
level
L01 DWK0KA
q
Controller output voltage to solenoid is above standard value when pump controller does not drive
Detail of failure 2-stage relief solenoid, so pump controller determines that open circuit exists in 2-stage relief so-
lenoid circuit.
q
Action of con- None in particular (Since no current flows, solenoid is not energized.)
q
troller If cause of failure disappears, machine becomes normal by itself.
q
Problem on Travel power is low (main relief valve is not set to high-pressure setting).
q
machine One-touch power maximizing function does not work.
q
Controller's command (ON/OFF) to 2-stage relief solenoid can be checked with monitoring func-
tion. (If controller sends solenoid ON command, monitoring display is ON even if solenoid is not
switched ON due to open circuit.) (Code: 02300 Solenoid 1)
Related infor-
q
As T-adapter for pump controller connector is "socket-type box", operating voltage cannot be mea-
mation
sured at pump controller connector.
q
Controller detects open circuit only when it does not drive solenoid.
q
Method of reproducing failure code: Turn starting switch to ON position.
Cause
Defective 2-stage relief solenoid
1
(Internal open circuit)
Open or short circuit in wiring har-
2
ness
Open circuit in wiring harness
3 (wire breakage or defective con-
tact of connector)
4 Defective pump controller
8
40-305
Failure code [DWK0KA] 2-stage Relief Sol Open Circuit
2-stage Relief Solenoid Open Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V02, and connect T-adapters to male side.
Between V02 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector C02 and connect T-adapters to female side.
a If resistance is above 1 Mz, wiring harness has open circuit. If resistance is
below 1 z, wiring harness has short circuit.
Between C02 (female) (109) and each of
(115), (117) and (120)
a If no failure is found by check on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and V02, and connect T-adapters to each
female side.
Between C02 (female) (109) and V02
(female) (1)
Between V02 (female) (2) and each of C02
(female) (115), (117) and (120)
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)
305 Troubleshooting by failure code, Part 5
Resistance
Resistance
Resistance
Resistance
PC200, 200LC, 220, 220LC-8M0
20 to 60 z
20 to 60 z
Max. 1 z
Max. 1 z