Komatsu PC200-8M0, Shop Manual, Page: 614 / 1254

301 Troubleshooting by failure code, Part 1
Failure code [CA227] Sens 2 Supply Volt High Error
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PC200, 200LC, 220, 220LC-8M0
SEN06133-00
Failure code [CA227] Sens 2 Supply Volt High Error
Failure code [CA234] Eng Overspeed
Action
level
Failure code
Failure
Sensor 2 Power Supply Voltage High Error
(Engine controller system)
L03 CA227
Detail of failure q High voltage appears in sensor power supply 2 circuit.
Action of con-
troller
q
Takes boost pressure and boost temperature to be at fixed values and allows engine to run.
q
Restricts engine output and allows engine to run.
Problem on
machine
q
Engine output lowers.
q Engine starting performance becomes deteriorated.
Related infor-
mation
q Method of reproducing failure code: Turn starting switch to ON position.
Cause Procedure, measuring location, criteria and remarks
Perform troubleshooting for failure code [ CA187 ].
Action
level
Failure code
Failure
Engine Overspeed
(Engine controller system)
– CA234
Detail of failure
q
Engine speed exceeds upper limit of speed control.
Action of con-
troller
q
Stops injection until engine speed lowers to normal level.
Problem on
machine
q
Engine speed fluctuates.
Related infor-
mation
q
Engine speed can be checked with monitoring function.
(Code:
01002 Engine speed)
q
Method of reproducing failure code: Start engine and keep it running at high idle.
Cause Procedure, measuring location, criteria and remarks
1 Use of improper fuel Fuel used may be improper. Check it.
2 Usage is improper
Method of using machine may be improper, so instruct operator on how to use
machine properly.
3 Defective engine controller
If no failure is found by checks on causes 1 and 2, engine controller may be
defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)