Failure Code [Ca238] Ne Speed Sens Supply Volt Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02629-03

Failure code [CA238] Ne Speed Sens Supply Volt Error

Action code Failure code
E15
Contents of
• Low voltage was detected in power supply circuit of engine Ne speed sensor.
trouble
Action of con-
• Controls the engine with signal from engine Bkup speed sensor.
troller
Problem that
• Engine does not start easily.
appears on
• Engine hunts.
machine
Related infor-
• Method of reproducing failure code: Turn starting switch ON.
mation
Defective sensor or wiring
1
Possible causes harness
and standard
value in normal
state
Defective wiring harness
2
connector
Circuit diagram related to engine Ne speed sensor
46
Trouble
CA238
Cause
Ne speed sensor supply power voltage 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
and wiring harness at
right in order and
Ne speed sensor
carry out operation to
reproduce trouble. If
"E" of failure code
goes off when sensor
or wiring harness is
Engine wiring har-
disconnected, that
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
40 Troubleshooting
C15
CE01
ness
PC300, 350-8
1