Failure Code [Dwk0Ka] 2-Stage Relief Sol. Open Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02631-02

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

Action code Failure code
— DWK0KA
Contents of
• No current flows at output to 2-stage relief solenoid circuit.
trouble
Action of con- • None in particular. (Since no current flows, solenoid does not operate.)
troller • If cause of failure disappears, system resets itself.
Problem that
appears on • Power maximizing function does not work.
machine
• Operating condition of 2-stage relief solenoid (ON/OFF) can be checked with monitoring function.
(Code 02300: Solenoid 1)
Related infor-
• Solenoid detects disconnection when output is turned on. To confirm the reproduction after repair, be
mation
sure to turn output on. (For more information on how to turn output on/off, see troubleshooting for
failure code [DWK0KB].)
Defective 2-stage relief sole-
1 noid
(Internal disconnection)
Disconnection in wiring har-
ness
2 (Disconnection in wiring or
Possible causes
defective contact in connec-
and standard
tor)
value in normal
state
Ground fault in wiring har-
ness
3
(Short circuit with GND cir-
cuit)
4 Defective pump controller
38
2-stage relief solenoid disconnection
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a
a
Wiring harness between CP02 (female)
(109) – V08 (female) (2)
Wiring harness between V08 (female) (1) –
CP02 (female) (115), (117), (120)
a
Wiring harness between CP02 (female)
(109) – V08 (female) (2) and chassis ground
a
Between (109) – chassis ground
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
V08 (male)
Between (1) – (2)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
CP02 (female)
40 Troubleshooting
1
Resistance
20 – 60 z
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resistance
20 – 60 z
PC300, 350-8