Failure Code [Ca238] Ne Speed Sens Supply Volt Error - Komatsu Galeo PC800-8 Shop Manual

SEN00790-02

Failure code [CA238] Ne Speed Sens Supply Volt Error

Action code Failure code
E15 CA238
Contents of
• High voltage error in engine Ne speed sensor power supply (5V) circuit.
trouble
Action of
• Controls the engine with signal from engine Bkup speed sensor.
controller
Problem that
• Engine stops during operations. (when engine Bkup speed sensor is also defective)
appears on
• Engine cannot be started during operations. (when engine Bkup speed sensor is also defective)
machine
Related
information
Defective Ne speed sensor
1
(Internal defect)
Disconnection in wiring
harness
2 (Disconnection in wiring or
defective contact in con-
nector)
Possible causes
and standard
value in normal
Ground fault in wiring har-
state
ness
3
(Short circuit with GND cir-
cuit)
Short circuit in wiring har-
ness
4
(with another wiring har-
ness)
5 Defective engine controller
48
Ne Speed Sens Supply Volt Error
Trouble
(Engine controller system)
Cause Standard value in normal state/Remarks on troubleshooting
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Disconnect sensors at
right in order. If no
error code is displayed,
that sensor is defec-
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (16) –
NE (female) (1)
Wiring harness between ENG (female) (48) –
NE (female) (2)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (16) –
NE (female) (1) and chassis ground
Wiring harness between ENG (female) (48) –
NE (female) (2) and chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (16) –
NE (female) (1) and between ENG
(female) (48) – NE (female) (2)
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Ne speed sensor
tive.
ENG
Between (16) – (48)
40 Troubleshooting
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
PC800, 850-8