10 PC800, 850-8
SEN00790-02 40 Troubleshooting
Failure code [B@BCNS] Eng. Water Overheat
Action code Failure code
Trouble
Engine coolant overheat
(Engine controller system)
— B@BCNS
Contents of
trouble
Engine coolant overheats while engine is running.
Action of
controller
• Limits output and continues operation.
Problem that
appears on
machine
• Engine output lowers.
• If machine is operated as it is, engine may be damaged.
Related
information
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Engine coolant overheat
Engine coolant may be overheating. Check it directly and remove cause
if it is overheating.
2
Defective coolant tempera-
ture sensor system
If cause 1 is not detected, coolant temperature sensor system may be
detective. Carry out troubleshooting for the failure codes [CA144] and
[CA145].
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