Failure Code [Ca238] Ne Speed Sensor Power Supply Error - Komatsu WA250-6 Shop Manual

SEN03842-00

Failure code [CA238] Ne speed sensor power supply error

Action code Failure code
E03
Contents of
• Low voltage is detected in engine Ne speed sensor power supply circuit.
trouble
Action of • Controls Ne speed sensor with signals of Bkup speed sensor.
controller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
• Starting performance is poor
appears on
• There is hunting from engine.
machine
Related
• Method of reproducing failure code: Turn the starting switch ON.
information
Defective sensor or wiring
1
harness
Possible causes
and standard
value in normal
state
Defective wiring harness
2
connector
Related circuit diagram
32
40-320
Trouble
CA238
Causes
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA238] Ne speed sensor power supply error
Ne speed sensor supply power error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Disconnect connector with starting switch OFF, then turn starting
switch ON and carry out troubleshooting.
Disconnect devices at
right in order. If failure
code disappears after
reproduction opera-
tion is conducted, that
device or wiring har-
ness has a defect in
it.
Connecting parts among each sensor, engine wiring harness, and
engine controller are suspected. Inspect them directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
Ne speed sensor CRANK SENSOR
Engine wiring
harness
WA250, 250PZ-6
1
EC1