Failure Code [Dwk0Kb] 2-Stage Relief Sol Short Circuit - Komatsu PC200-8M0 Shop Manual

SEN06137-00

Failure code [DWK0KB] 2-stage Relief Sol Short Circuit

Action
Failure code
level
L01 DWK0KB
q
Abnormal current flows when pump controller drives 2-stage relief solenoid, so pump controller de-
Detail of failure
termines that short circuit exists in 2-stage relief solenoid circuit.
q
Stops driving 2-stage relief solenoid.
Action of con-
q Even if cause of failure disappears, machine does not become normal until starting switch is set to
troller
OFF position.
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 short 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 short circuit or ground
fault)
Ground fault in wiring harness
2
(contact with ground circuit)
3 Short circuit in wiring harness
4 Defective pump controller
10
40-305
Failure code [DWK0KB] 2-stage Relief Sol Short Circuit
2-stage Relief Solenoid Short 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)
Between V02 (female) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and V02, and connect T-adapters to female
side of V02.
Between C02 (female) (109) or V02 (female) (1)
and ground
1. Turn starting switch to OFF position.
2. Disconnect connectors C02 and V02, and connect T-adapters to female
side of V02.
Between V02 (male) (1) and (2)
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 20 to 60 z
Resistance
Resistance Min. 1 Mz
Resistance
PC200, 200LC, 220, 220LC-8M0
Min. 1 Mz
Min. 1 Mz