When Starting Switch Turned On (Before Starting Engine), Basic Check Item Lights Up - Komatsu PC130-8 Shop Manual

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