Failure Code [Ca238] Ne Speed Sensor Sup. Volt. Error - Komatsu Galeo PC138US-8 Shop Manual

SEN02463-01

Failure code [CA238] Ne speed sensor sup. volt. error

User code Failure code
E15
Contents of
• Abnormality occurred in Ne speed sensor power supply (5 V) circuit.
trouble
Action of
• Controls Ne speed sensor with signals of Bkup speed sensor.
controller
Problem that
• Running engine stops (when Bkup speed sensor is also abnormal).
appears on
• Stopped engine cannot be started (when Bkup speed sensor is also abnormal).
machine
Related
• Method of reproducing failure code: Turn starting switch ON.
information
Defective Ne speed sensor
1
(Internal trouble)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
3 ness (Short circuit with GND
circuit)
Short circuit in wiring har-
4 ness (with another wiring
harness)
5 Defective engine controller
34
Trouble
CA238
Cause
Ne speed sensor sup. volt. error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Disconnect devices
at right in order. If
error code disap-
pears when a device Ne speed sensor
is disconnected, that
device has a defect
in it.
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (26)
– NE (female) (1)
Wiring harness between CE01 (female) (44)
– NE (female) (2)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (26)
– NE (female) (1) and chassis ground
Wiring harness between CE01 (female) (44)
– NE (female) (2) and chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (26)
– NE (female) (1) and between CE01
(female) (44) – NE (female) (2)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CE01
Between (26) – (44)
40 Troubleshooting
1
NE connector
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage
4.75 – 5.25 V
PC138US, USLC-8