Swing Lock Monitor Does Not Indicate Normally - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02632-02
E-14 Swing lock monitor does not indicate normally
• When swing lock switch is turned ON, swing lock monitor does not light up.
Trouble
• When swing lock switch is turned OFF, swing lock monitor lights up.
Related infor- • Input from swing lock switch (ON/OFF) can be checked with monitoring function.
mation (Code 04502: Monitor Input 3)
Defective swing lock switch
1 (Internal disconnection or
short circuit)
Disconnection in wiring har-
ness
2 (Disconnection in wiring or
defective contact in connec-
tor)
Possible causes
and standard
Ground fault in wiring har-
value in normal
ness
state
3
(Short circuit with GND cir-
cuit)
Hot short (Short circuit with
4
24V circuit) in wiring harness
5 Defective machine monitor
28
Cause Standard value in normal state/Remarks on troubleshooting
a
Between (1) – (2)
a
Wiring harness between CM02 (female) (5) –
J02 – S04 (male) (5)
Wiring harness between S04 (male) (6) –
J05 – chassis ground
a
Wiring harness between CM02 (female) (5) –
J02 – S04 (male) (5) and chassis ground
a
Wiring harness between CM02 (female) (5) –
J02 – S04 (male) (5) and chassis ground
a
Between (5) –
chassis ground
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
S04 (female) Swing lock switch
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 turn starting switch ON
and carry out troubleshooting.
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CM02 Swing lock switch
40 Troubleshooting
Resistance
OFF Min. 1 Mz
Max. 1 z
ON
Resis-
tance
Resis-
tance
Resis-
tance
Voltage
Voltage
OFF 20 – 30 V
ON Max. 1 V
PC300, 350-8
1
Max. 1 z
Max. 1 z
Min. 1 Mz
Max. 1 V