Failure Code [B@Bcns] Eng. Water Overheat - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02629-03

Failure code [B@BCNS] Eng. Water Overheat

Action code Failure code
— B@BCNS
Contents of • While engine was running, signal circuit of engine coolant temperature sensor detected overheating
trouble of engine coolant (above about 102°C).
Action of • Displays engine coolant temperature monitor with red on machine monitor.
controller • If cause of failure disappears, system resets itself.
Problem that
appears on • If machine is operated as it is, engine may be seized.
machine
• Engine coolant temperature sensor signal is input to engine controller and then transmitted to
machine monitor.
Related infor-
• Engine coolant temperature can be checked with monitoring function
mation
(Code: 04107 Engine coolant temperature)
• Method of reproducing failure code: Start engine.
Possible Overheating of engine
causes and 1 coolant (when system is
standard normal)
value in nor-
Defective engine coolant
mal state
2
temperature gauge system
14
Engine coolant overheat
Trouble
(Engine controller system)
Cause Standard value in normal state/Remarks on troubleshooting
Engine coolant may be overheating. Check it and remove cause if
it is overheating.
If cause 1 is not detected, engine coolant temperature gauge sys-
tem may be defective. Carry out troubleshooting for "[CA144]
[CA145]" in troubleshooting.
40 Troubleshooting
1
PC300, 350-8