Failure Code [B@Bczk] Eng Water Level Low - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02629-03

Failure code [B@BCZK] Eng Water Level Low

Action code Failure code
— B@BCZK
Contents of • When starting switch is turned ON, signal circuit of radiator coolant level sensor detected low radiator
trouble coolant level (sensor contact opened).
Action of • Displays radiator coolant level monitor on machine monitor.
machine monitor • Even if cause of failure disappears, system does not reset itself until starting switch is turned OFF.
Problem that
appears on • If machine is operated as it is, engine may overheats.
machine
• Condition of radiator coolant level switch can be checked with monitoring function
Related infor-
(Code: 04500 Monitor input 1)
mation
• Method of reproducing failure code: Turn starting switch ON.
Lowering of radiator coolant
1 level
(when system is normal)
Defective radiator coolant
2 level switch (internal discon-
nection)
Possible causes
and standard
Disconnection in wiring har-
value in normal
ness
state
3 (Disconnection in wiring or
defective contact in connec-
tor)
4 Defective machine monitor
16
Engine coolant level low
Trouble
(Machine monitor system)
Cause Standard value in normal state/Remarks on troubleshooting
a
a
Between (1) – (2)
a
Wiring harness between CM02 (female) (3) –
P24 (female) (1)
Wiring harness between P24 (female) (2) –
chassis ground
a
Between (3) – chas-
Check the coolant level and add coolant.
(If this phenomenon frequently occurs, investigate the cause.)
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
P24 (male) Radiator coolant level
Value in normal state
Value when coolant
level is low
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CM02 Radiator coolant level
Value in normal state
Value when coolant
sis ground
level is low
40 Troubleshooting
1
Resistance
Max. 1 z
Min. 1Mz
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Voltage
Max. 1 V
20 – 30 V
PC300, 350-8