Komatsu PC130-8 User Manual

SEN04123-01 40 Troubleshooting
8 PC130-8
E-2 When starting switch turned ON (before starting engine), basic
check item lights up 1
Trouble (1) Radiator coolant level monitor lights up red.
Related infor-
mation
• Although radiator coolant level monitor is basic check item, it is also checked while engine is running.
(If monitor lights up red while engine is running, carry out this troubleshooting, too.)
• Condition of radiator coolant level switch signal can be checked with monitoring function.
(Code: 04500 Monitor input 1)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Lowering of radiator coolant
level (When system is nor-
mal)
Coolant level in radiator sub tank may be low. Check it and add
coolant if necessary.
2
Defective radiator coolant
level switch (Internal discon-
nection)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
P24 (male)
Sub tank coolant
level
Resistance
Between (1) – (2)
Between
FULL – LOW
Max. 1 z
Below LOW Min. 1 Mz
3
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CM02 (female) (3)
– P24 (female) (1)
Resis-
tance
Max. 1 z
Wiring harness between P24 (female) (2) –
chassis ground (T10)
Resis-
tance
Max. 1 z
4 Defective machine monitor
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CM02
Sub tank coolant
level
Voltage
Between (3) –
chassis ground
Between
FULL – LOW
Max. 1 V
Below LOW 20 – 30 V

Komatsu PC130-8 Specifications

General

Brand	Komatsu
Model	PC130-8
Category	Excavators
Language	English