Komatsu SAA6D114E-3 - Code [238;CA238] Ne Speed Sensor Sup. Volt. Error

SEN00459-01 40 Troubleshooting
30 114E-3 Series
E-17 Code [238/CA238] Ne Speed Sensor Sup. Volt. Error 1
Circuit diagram related to engine Ne speed sensor
Error code Failure code
Trouble Abnormality in Ne speed sensor power supply
238 CA238
Contents of
trouble
• Low voltage is detected in engine Ne speed sensor power supply circuit.
Action of
controller
• Controls Ne speed sensor with signals of Bkup speed sensor.
Problem that
appears
on machine
• Starting performance is poor
• There is hunting from engine.
Related infor-
mation
• Method of reproducing failure code: Starting switch ON.
Possible
causes and
standard value
in normal state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective sensor or wiring
harness
a Disconnect connector with starting switch OFF, then turn starting
switch ON and carry out troubleshooting.
Disconnect devices at
right in order.
If mark E of failure
code disappears after
reproduction opera-
tion is conducted, that
device or wiring
harness has a
defect in it.
Ne speed sensor CRANK SENSOR
Engine wiring
harness
J1
2
Defective wiring harness
connector
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