Komatsu Galeo PC850-8 User Manual

12 PC800, 850-8
SEN00790-02 40 Troubleshooting
Failure code [B@BCZK] Eng. Water Lvl Low
Action code Failure code
Trouble
Eng. Water Lvl Low
(Machine monitor system)
— B@BCZK
Contents of
trouble
• While engine was running, signal circuit of radiator coolant level switch was opened (disconnected
with GND).
Action of
controller
• None in particular.
Problem that
appears on
machine
• If machine is operated as it is, engine may overheat.
Related
information
• If the radiator coolant level monitor on the machine monitor lights up in red while the engine is stopped
(the starting switch is at the ON position), this failure code is recorded.
• Input from the radiator coolant level switch (ON/OFF) 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
Sub-tank coolant level low
(While system is normal)
Check the radiator sub-tank coolant level. If it is low, add coolant.
(If it is reduced frequently, find out the cause.)
2
Defective radiator coolant
level switch 1
(Internal disconnection)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
P24A (male) Sub-tank coolant level Resistance
Between (1) – (2)
Within normal level Max. 1 z
Below LOW level Min. 1 Mz
3
Defective radiator coolant
level switch 2
(Internal disconnection)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
P24B (male) Sub-tank coolant level Resistance
Between (1) – (2)
Within normal level Max. 1 z
Below LOW level Min. 1 Mz
4
Disconnection in wiring har-
ness
(Disconnection in wiring or
defective contact in connec-
tor)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CM02 (female) (3) –
P24A (female) (1)
Resis-
tance
Max. 1 z
Wiring harness between P24A (female) (2) –
P24B (female) (1)
Resis-
tance
Max. 1 z
Wiring harness between P24B (female) (2) –
chassis ground
Resis-
tance
Max. 1 z
5 Defective machine monitor
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
CM02 Sub-tank coolant level Voltage
Between (3) –
chassis ground
Within normal level Max. 1 V
Below LOW level 20 – 30 V

Komatsu Galeo PC850-8 Specifications

General

Brand	Komatsu
Model	Galeo PC850-8
Category	Excavators
Language	English