Failure Code [Ca187] Sens Supply 2 Volt Low Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02629-03

Failure code [CA187] Sens Supply 2 Volt Low Error

Action code Failure code
E15
Contents of
• Low voltage was detected in sensor power supply 2 circuit.
trouble
Action of con- • Fixes charge pressure and charge temperature values and continues operation.
troller • Limits output and continues operation.
Problem that
appears on • Engine output lowers.
machine
Related infor-
• Method of reproducing failure code: Turn starting switch ON.
mation
Defective sensor or wiring
1
harness
Possible causes
and standard
value in normal
state
Defective wiring harness
2
connector
3 Defective engine controller
38
Trouble
CA187
Cause
Sensor power supply 2 voltage low error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a
Disconnect connector with starting switch OFF, then turn start-
ing switch ON and carry out troubleshooting.
Disconnect sensor
Boost pressure, tem-
and wiring harness at
right in order and
carry out operation to
Common rail pres-
reproduce trouble. If
"E" of failure code
goes off when sensor
or wiring harness is
disconnected, that
Engine wiring har-
sensor or wiring har-
ness is defective.
Connecting parts between each sensor – engine wiring harness –
engine controller may be defective. Check them directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
If causes 1 and 2 are not detected, engine controller may be defec-
tive. (Since trouble is in system, troubleshooting cannot be carried
out.)
40 Troubleshooting
perature sensor
sure sensor
Bkup sensor
ness
1
C4
C8
C13
CE01
PC300, 350-8