44 PC800, 850-8
SEN00792-02 40 Troubleshooting
Failure code [DWK0KB] 2-stage Relief Sol. S/C
Action code Failure code
Trouble
2-stage Relief Sol. S/C
(Pump controller system)
— DWK0KB
Contents of
trouble
• Abnormal current flowed at output to 2-stage relief solenoid circuit.
Action of
controller
• Turns output to 2-stage relief solenoid circuit OFF.
• Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on
machine
• Travel power is low (The main relief valve is not set in the HIGH PRESSURE position).
Related
information
• Operating condition of 2-stage relief solenoid (ON/OFF) can be checked with monitoring function.
(Code 02300: Solenoid 1)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective 2-stage relief
solenoid
(Internal short circuit or
ground fault)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
V08 (male) Resistance
Between (2) – (1) 20 – 60 z
Between (2) – chassis ground Min. 1 Mz
2
Ground fault in wiring har-
ness
(Short circuit with GND cir-
cuit)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CP03 (female) (17) –
V08 (female) (2) and chassis ground
Resistance Min. 1 Mz
3 Defective pump controller
aPrepare with starting switch OFF, then keep the engine running and
carry out troubleshooting.
CP03 Travel control lever Voltage
Between (17) –
chassis ground
NEUTRAL Max. 1 V
Travel operation 20 – 30 V
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