Failure Code [Dwk0Kb] 2-Stage Relief Sol. Short Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02631-02

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

Action code Failure code
— DWK0KB
Contents of
• Abnormal current flowed at output to 2-stage relief solenoid circuit.
trouble
Action of con- • Turns output to 2-stage relief solenoid circuit OFF.
troller • Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on • Power maximizing function does not work.
machine
Related infor- • Operating condition of 2-stage relief solenoid (ON/OFF) can be checked with monitoring function.
mation (Code 02300: Solenoid 1)
Defective 2-stage relief sole-
noid
1
(Internal short circuit or
ground fault)
Possible causes
Hot short (Short circuit with
and standard
2
24V circuit) in wiring harness
value in normal
state
3 Defective pump controller
40
2-stage relief solenoid short circuit
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a
Between (2) – chassis ground
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 turn starting switch ON
and carry out troubleshooting.
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CP02 Working mode
When L-mode is not
selected
When L-mode is
selected
40 Troubleshooting
1
Resistance
20 – 60 z
Min. 1 Mz
Voltage Max. 1 V
Voltage
Max. 1 V
20 – 30 V
PC300, 350-8