Failure Code [B@Bczk] Eng. Water Lvl Low - Komatsu Galeo PC800-8 Shop Manual

SEN00790-02

Failure code [B@BCZK] Eng. Water Lvl Low

Action code Failure code
— B@BCZK
Contents of • While engine was running, signal circuit of radiator coolant level switch was opened (disconnected
trouble with GND).
Action of
• None in particular.
controller
Problem that
appears on • If machine is operated as it is, engine may overheat.
machine
• If the radiator coolant level monitor on the machine monitor lights up in red while the engine is stopped
Related (the starting switch is at the ON position), this failure code is recorded.
information • Input from the radiator coolant level switch (ON/OFF) can be checked with monitoring function.
(Code 04500: Monitor Input 1)
Sub-tank coolant level low
1
(While system is normal)
Defective radiator coolant
2 level switch 1
(Internal disconnection)
Defective radiator coolant
3 level switch 2
(Internal disconnection)
Possible causes
and standard
value in normal
state
Disconnection in wiring har-
ness
4 (Disconnection in wiring or
defective contact in connec-
tor)
5 Defective machine monitor
12
Eng. Water Lvl Low
Trouble
(Machine monitor system)
Cause Standard value in normal state/Remarks on troubleshooting
Check the radiator sub-tank coolant level. If it is low, add coolant.
(If it is reduced frequently, find out the cause.)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
P24A (male)
Between (1) – (2)
aTurn the engine starting switch OFF for the preparations, and hold it in
the OFF position during the troubleshooting.
P24B (male)
Between (1) – (2)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between CM02 (female) (3) –
P24A (female) (1)
Wiring harness between P24A (female) (2) –
P24B (female) (1)
Wiring harness between P24B (female) (2) –
chassis ground
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Between (3) –
chassis ground
Sub-tank coolant level
Within normal level
Below LOW level
Sub-tank coolant level
Within normal level
Below LOW level
CM02 Sub-tank coolant level
Within normal level
Below LOW level
40 Troubleshooting
Resistance
Max. 1 z
Min. 1 Mz
Resistance
Max. 1 z
Min. 1 Mz
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Voltage
Max. 1 V
20 – 30 V
PC800, 850-8