14 PC800, 850-8
SEN00791-02 40 Troubleshooting
Failure code [CA689] Eng Ne Speed Sensor Error
Action code Failure code
Trouble
Eng Ne Speed Sensor Error
(Engine controller system)
E15 CA689
Contents of
trouble
• There is error in engine Ne speed sensor circuit.
Action of
controller
• Operates the engine with signal from engine Bkup speed sensor.
Problem that
appears on
machine
• Engine stops during operations. (When engine Bkup speed sensor is also defective)
• Engine cannot be started while stopping. (When engine Bkup speed sensor is also defective)
Related
information
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective sensor power
supply system
If failure code [CA238] is displayed, carry out troubleshooting for it first.
2
Disconnection in wiring har-
ness
(Disconnection in wiring or
defective contact in con-
nector)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENGINE (female) (16) –
NE (female) (1)
Resis-
tance
Max. 1 z
Wiring harness between ENGINE (female) (48) –
NE (female) (2)
Resis-
tance
Max. 1 z
Wiring harness between ENGINE (female) (27) –
NE (female) (3)
Resis-
tance
Max. 1 z
3
Ground fault in wiring har-
ness
(Short circuit with GND cir-
cuit)
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
Resis-
tance
Min. 1 Mz
Wiring harness between ENG (female) (48) –
NE (female) (2) and chassis ground
Resis-
tance
Min. 1 Mz
Wiring harness between ENG (female) (27) –
NE (female) (3) and chassis ground
Resis-
tance
Min. 1 Mz
4
Short circuit in wiring har-
ness
(with another wiring har-
ness)
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)
Resis-
tance
Min. 1 Mz
Wiring harness between ENG (female) (16) –
NE (female) (1) and between ENG
(female) (27) – NE (female) (3)
Resis-
tance
Min. 1 Mz
Wiring harness between ENG (female) (48) –
NE (female) (2) and between ENG
(female) (27) – NE (female) (3)
Resis-
tance
Min. 1 Mz
5
Defective sensor installa-
tion or defective rotation
sensor parts
Ne speed sensor may be installed defectively (improper clearance), or
rotation sensor parts (flywheel) may be defective. Check them directly.
6
Defective engine Ne speed
sensor
If causes 1 – 5 are not detected, engine Ne speed sensor may be defec-
tive. (Since trouble is in system, troubleshooting cannot be carried out.)
7 Defective engine controller
If causes 1 – 5 are not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
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