Komatsu Galeo PC138US-8 User Manual

SEN02463-01 40 Troubleshooting
34 PC138US, USLC-8
Failure code [CA238] Ne speed sensor sup. volt. error 1
User code Failure code
Trouble
Ne speed sensor sup. volt. error
(Engine controller system)
E15 CA238
Contents of
trouble
• Abnormality occurred in Ne speed sensor power supply (5 V) circuit.
Action of
controller
• Controls Ne speed sensor with signals of Bkup speed sensor.
Problem that
appears on
machine
• Running engine stops (when Bkup speed sensor is also abnormal).
• Stopped engine cannot be started (when Bkup speed sensor is also abnormal).
Related
information
• Method of reproducing failure code: Turn starting switch ON.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective Ne speed sensor
(Internal trouble)
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
is disconnected, that
device has a defect
in it.
Ne speed sensor NE connector
2
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
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)
Resis-
tance
Max. 1 z
Wiring harness between CE01 (female) (44)
– NE (female) (2)
Resis-
tance
Max. 1 z
3
Ground fault in wiring har-
ness (Short circuit with GND
circuit)
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
Resis-
tance
Min. 1 Mz
Wiring harness between CE01 (female) (44)
– NE (female) (2) and chassis ground
Resis-
tance
Min. 1 Mz
4
Short circuit in wiring har-
ness (with another wiring
harness)
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)
Resis-
tance
Min. 1 Mz
5 Defective engine controller
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CE01 Voltage
Between (26) – (44) 4.75 – 5.25 V

Komatsu Galeo PC138US-8 Specifications

General

Brand	Komatsu
Model	Galeo PC138US-8
Category	Excavators
Language	English