Komatsu PC130-7, Shop Manual

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20-310
PC130-7
TROUBLESHOOTING
(1)
Error code [104] (Clogging of air cleaner)
Circuit diagram related to air cleaner clogging switch
User code Error code
Trouble Clogging of air cleaner(Monitor panel system)
– 104
Contents of
trouble
• The signal circuit of the air cleaner clogging switch is opened (disconnected from the chassis ground)
while the engine is running.
Action of
monitor panel
• None in particular.
Problem that
appears on
machine
• If the machine is operated as it is, the engine may be damaged.
Related
information
• If the air cleaner clogging monitor of the monitor panel flashes while the engine is running, this error
code is recorded.
• The input state (ON/OFF) from the air cleaner clogging switch can be checked with the monitoring func-
tion. (Code: 046, Right of upper line)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Clogging of air cleaner
(When system is normal)
Check the air cleaner. If it is clogged, clean or replace it.
2
Defective air cleaner clog-
ging switch (Internal dis-
connection)
a
Prepare with starting switch OFF, then start engine and carry out trou-
bleshooting.
A31 (male) Air cleaner Resistance
Between (1) and (2)
When normal Max.1
z
When clogged Min.1 M
z
3
Disconnection in wiring
harness (Disconnection in
wiring harness or defective
contact in connector)
a
Prepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between P02 (female) (5) and
A31 (female) (1)
Resistance Max.1
z
Wiring harness between P11 (female) (2) and
chassis ground (A15)
Resistance
Max.1
z
4 Defective monitor panel
a
Prepare with starting switch OFF, then start engine and carry out trou-
bleshooting.
P02 Air cleaner Voltage
Between (5) and
chassis ground
When normal Max. 1 V
When clogged 20 – 30 V
[104]