Failure Code [Ca689] Eng Ne Speed Sensor Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02630-05

Failure code [CA689] Eng Ne Speed Sensor Error

Action code Failure code
E15
Contents of
• There is error in signal from engine Ne speed sensor.
trouble
Action of con-
• Continues control with signal from engine Bkup speed sensor.
troller
Problem that • Engine hunts.
appears on • Engine does not start easily.
machine • Engine output lowers.
Related infor-
• Method of reproducing failure code: Start engine.
mation
Defective Ne speed sensor
1
power supply system
Defective engine Ne speed
2
sensor
Breakage or improper clear-
3 ance of engine Ne speed
Possible causes sensor
and standard
Breakage of rotation sensor
4
value in normal
wheel
state
Disconnection in wiring har-
ness
5 (Disconnection in wiring or
defective contact in connec-
tor)
Ground fault in wiring har-
ness
6
(Short circuit with GND cir-
cuit)
Hot short (Short circuit with
7 5V/24V circuit) in wiring har-
ness
32
Trouble
CA689
Cause
Engine Ne speed sensor error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA238] is also indicated, carry out troubleshooting
for it first.
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
C15
Between (1) – (2)
Voltage is measured with wiring harness connected. Accordingly, if
voltage is abnormal, check wiring harness and controller, too, for
another cause of trouble, and then judge.
Engine Ne speed sensor may be broken or may have improper
clearance. Check it directly.
Rotation sensor wheel may be broken. Check it directly.
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (27)
– C15 (female) (3)
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (27)
– C15 (female) (3) and chassis ground
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between CE01 (female) (27)
– C15 (female) (3) and chassis ground
40 Troubleshooting
Power supply 4.75 – 5.25 V
Resis-
tance
Resis-
tance
Voltage
PC300, 350-8
1
Voltage
Max. 10 z
Min.
100 kz
Max. 1 V