Failure Code [Ca689] Eng. Ne Speed Sensor Error - Komatsu Galeo PC138US-8 Shop Manual

SEN02464-01

Failure code [CA689] Eng. Ne speed sensor error

User code Failure code
E15
Contents of
• Abnormality occurred in engine Ne speed sensor circuit.
trouble
Action of
• Operates 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: Start engine.
information
Defective sensor power sup-
1
ply system
Disconnection in wiring har-
ness
2 (Disconnection in wiring or
defective contact in connec-
tor)
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 mount of sensor or
5 defective rotation sensing
part
Defective engine Ne speed
6
sensor
20
Trouble
CA689
Causes
Eng. Ne speed sensor error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA238] is indicated, carry out troubleshooting for it
first.
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)
Wiring harness between CE01 (female) (42)
– NE (female) (3)
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
Wiring harness between CE01 (female) (42)
– NE (female) (3) 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
wiring harness between CE01 (female) (44)
– NE (female) (2)
Wiring harness between CE01 (female) (26)
– NE (female) (1) and
wiring harness between CE01 (female) (42)
– NE (female) (3)
Wiring harness between CE01 (female) (44)
– NE (female) (2) and
wiring harness between CE01 (female) (42)
– NE (female) (3)
Check Ne speed sensor directly for defective mount (defective
clearance) or check rotation sensing part (crankshaft pulley)
directly for defect.
If causes 1 – 5 are not detected, engine Ne speed sensor may be
defective. (Since trouble is in system, troubleshooting cannot be
carried out.)
40 Troubleshooting
1
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
PC138US, USLC-8