Failure Code [Dw45Ka] Swing Brake Sol. Open Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02631-02

Failure code [DW45KA] Swing Brake Sol. Open Circuit

Action code Failure code
E03 DW45KA
Contents of
• No current flows at output to swing holding brake 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 • Machine cannot swing.
machine
• Operating condition of swing holding brake solenoid (ON/OFF) can be checked with monitoring func-
tion. (Code 02300: Solenoid 1)
• If solenoid and wiring harness are normal, operator can swing machine by setting emergency swing
brake release switch in release position (Swing holding brake does not work, however, when
Related infor-
machine stops).
mation
• Turn both of swing lock and emergency swing release switches OFF during troubleshooting.
• Solenoid detects disconnection when output is turned on. To confirm the reproduction after repair, be
sure to turn output on. (For more information on how to turn output on/off, see troubleshooting for
failure code [DW45KB].)
Defective swing holding
1 brake solenoid (Internal dis-
connection)
Defective swing lock switch
2
(Internal disconnection)
Possible causes
and standard
Defective assembled-type
value in normal
3 diode D01
state
(Internal disconnection)
Disconnection in wiring har-
ness
4 (Disconnection in wiring or
defective contact in connec-
tor)
22
Swing holding brake solenoid disconnection
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a
a
Between (3) – (4)
a
Between (7) – (3)
a
Wiring harness between CP02 (female)
(101) – D01 (female) (7)
Wiring harness between D01 (female) (3) –
J02 – S04 (male) (3)
Wiring harness between S04 (male) (4) –
V05 (female) (2)
Wiring harness between V05 (female) (1) –
CP02 (female) (115), (117), (120)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
V05 (male)
Between (1) – (2)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
S04 (female)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
D01 (male) Digital circuit tester
Diode mode
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
40 Troubleshooting
Resistance
20 – 60 z
Switch Resistance
Max. 1 z
OFF
LOCK Min. 1 Mz
Continuity
There is continuity
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
PC300, 350-8
1
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z