SEN00460-01 40 Troubleshooting
32 114E-3 Series
E-44 Code [689/CA689] Eng. Ne Speed Sensor Error 1
Error code Failure code
Trouble Abnormality in engine Ne speed sensor
689 CA689
Contents of trou-
ble
• Abnormality occurred in signals from engine Ne speed sensor.
Action of
controller
• Controls Ne speed sensor with signals of Bkup speed sensor.
Problem that
appears
on machine
• There is hunting from engine.
• Starting performance is poor
• Engine output drops.
Related informa-
tion
• Method of reproducing failure code: Start engine.
Possible
causes and
standard value
in normal state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective Ne speed sensor
power supply system
If failure code [CA238] is indicated simultaneously, carry out trouble-
shooting for it first.
2
Defective engine Ne speed
sensor
a Prepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
CRANK SENSOR Voltage
Between (1) – (2) Power supply 4.75 – 5.25 V
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.
3
Broken engine Ne speed sen-
sor or defective clearance
Inspect engine Ne speed sensor for breakage or clearance.
4
Broken rotation sensing fly-
wheel
Inspect it for breakage directly.
5
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J1 (female) (27) –
CRANK SENSOR (female) (3)
Resis-
tance
Max. 10 z
6
Ground fault in wiring har-
ness (Short circuit with GND
circuit)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J1 (female) (27) –
CRANK SENSOR (female) (3) and chassis
ground
Resis-
tance
Min.
100 kz
7
Hot short (Short circuit with
5V, 24V circuit) in wiring har-
ness
a Prepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Wiring harness between J1 (female) (27) –
CRANK SENSOR (female) (3) and chassis
ground
Voltage Max. 1 V
8
Short circuit in wiring harness
(With another wiring harness)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J1 (female) (27) –
CRANK SENSOR (female) (3) and J1
(female) (16) – CRANK SENSOR (female)
(1)
Resis-
tance
Min.
100 kz
Wiring harness between J1 (female) (27) –
CRANK SENSOR (female) (3) and J1
(female) (48) – CRANK SENSOR (female)
(2)
Resis-
tance
Min.
100 kz
9
Defective wiring harness con-
nector
Connecting parts among engine Ne speed sensor, engine wiring
harness, and engine controller are suspected. Inspect them directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
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