Failure Code [Dwk0Ka] 2-Stage Relief Sol. Disc - Komatsu Galeo PC800-8 Shop Manual

SEN00792-02

Failure code [DWK0KA] 2-stage Relief Sol. Disc.

Action code Failure code
— DWK0KA
Contents of
• No current flows at output to 2-stage relief solenoid circuit.
trouble
Action of • None in particular. (Since no current flows, solenoid does not operate.)
controller • If cause of failure disappears, system resets itself.
Problem that
appears on • Travel power is low (The main relief valve is not set in the HIGH PRESSURE position).
machine
• Operating condition of 2-stage relief solenoid (ON/OFF) can be checked with monitoring function.
(Code 02300: Solenoid 1)
Related
• Solenoid detects disconnection when output is turned on. To confirm the reproduction after repair, be
information
sure to turn output on. (For more information on how to turn output on/off, see troubleshooting for fail-
ure code [DWK0KB].)
Defective 2-stage relief
1 solenoid
(Internal disconnection)
Disconnection in wiring har-
ness
(Disconnection in wiring or
2
Possible causes
defective contact in connec-
and standard
tor)
value in normal
state
Hot short (short circuit with
3 24V circuit) in wiring har-
ness
4 Defective pump controller
42
2-stage Relief Sol. Disc.
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CP03 (female) (17) –
V08 (female) (2)
Wiring harness between V08 (female) (1) – J22
– CP03 (female) (3), (13), (23)
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Wiring harness between CP03 (female) (17) –
V08 (female) (2) and chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Between (17) – chassis ground
V08 (male)
Between (2) – (1)
CP03 (female)
40 Troubleshooting
Resistance
20 – 60 z
Resistance Max. 1 z
Resistance Max. 1 z
Voltage Max. 1 V
Resistance
20 – 60 z
PC800, 850-8