Failure Code [Ca689] Eng Ne Speed Sensor Error - Komatsu Galeo PC800-8 Shop Manual

SEN00791-02

Failure code [CA689] Eng Ne Speed Sensor Error

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