Failure Code [Ca234] Engine Overspeed - Komatsu WA250-6 Shop Manual

320 Troubleshooting by failure code (Display of code), Part 2

Failure code [CA234] Engine overspeed

Failure code [CA234] Engine overspeed
Action code Failure code
E02
Contents of
• Engine speed is above upper control limit.
trouble
Action of • Stops injection of injector until engine speed drops to normal level.
controller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
appears on
• Engine speed fluctuates.
machine
Related • Engine speed can be checked by monitoring function (Code: ENGINE, 01001, ENG SPEED).
information
• Method of reproducing failure code: Start engine and running at high idle.
1 Use of improper fuel
Possible causes
and standard
2 Improper way of use
value in normal
state
3 Defective engine controller
WA250, 250PZ-6
Trouble
CA234
Causes
Engine Overspeed
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
Check fuel used directly.
Way of use may be improper. Teach proper way of use to operator.
If causes 1 and 2 are not detected, engine controller may be defec-
tive. (Since trouble is in system, troubleshooting cannot be carried
out.)
SEN03842-00
1
31
40-320