Failure Code [Dw45Kb] Swing Brake Sol. Short Circuit - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02631-02

Failure code [DW45KB] Swing Brake Sol. Short Circuit

Action code Failure code
E03 DW45KB
Contents of
• Abnormal current flowed at output to swing holding brake solenoid circuit.
trouble
Action of con- • Turns output to swing holding brake 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 • Machine cannot swing.
machine
• Operating condition of swing holding brake solenoid (ON/OFF) can be checked with monitoring func-
tion. (Code 02300: Solenoid 1)
Related infor-
• If solenoid and wiring harness are normal, operator can swing machine by setting emergency swing
mation
brake release switch in release position (Swing holding brake does not work, however, when
machine stops).
Defective swing holding
1 brake solenoid (Internal short
circuit or ground fault)
Defective assembled-type
2 diode D01
(Internal short circuit)
Possible causes
and standard
value in normal
state
Hot short (Short circuit with
3
24V circuit) in wiring harness
4 Defective pump controller
26
Swing holding brake solenoid short circuit
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
a
Between (2) – chassis ground
a
a
Wiring harness between CP02 (female)
(101) – D01 – H15 – S04 (male) (3) and
chassis ground
Wiring harness between V05 (female) (2) –
H15 – S04 (male) (4) and chassis ground
a
Between (101) –
chassis ground
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.
D01 (male)
Between (3) – (7)
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Prepare with starting switch OFF, then start engine and carry
out troubleshooting.
CP02 Swing lever
At neutral
At swing
40 Troubleshooting
1
Resistance
20 – 60 z
Min. 1 Mz
Resistance
Min. 1 Mz
Voltage Max. 1 V
Voltage Max. 1 V
Voltage
Max. 1 V
20 – 30 V
PC300, 350-8