SEN00460-01 40 Troubleshooting
24 114E-3 Series
E-39 Code [451/CA451] Rail Press. Sensor High Error 1
Error code Failure code
Trouble Abnormally high level in common rail pressure sensor
451 CA451
Contents of
trouble
• High voltage occurred in common rail pressure sensor.
Action of con-
troller
• Limits output and continues operation.
Problem that
appears on
machine
• Engine speed or output drops.
• Engine does not start
Related infor-
mation
• Method of reproducing failure code: Starting switch ON.
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective sensor power sup-
ply 2 system
If failure code [CA227] is indicated simultaneously, carry out trouble-
shooting for it first.
2
Defective common rail pres-
sure sensor
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
FUEL RAIL PRESS Voltage
Between (3) – (1) 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
Hot short (Short circuit with 5
V, 24 V 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) (25) –
FUEL RAIL PRESS (female) (2)
Voltage Max. 1 V
4
Short circuit in wiring har-
ness (With another wiring
harness)
a Troubleshoot with starting switch OFF, then carry out trouble-
shooting without turning starting switch ON.
Wiring harness between J1 (female) (25) –
FUEL RAIL PRESS (female) (2) and J1
(female) (37) – FUEL RAIL PRESS (female)
(3)
Resis-
tance
Min.
100 kz
5
Defective wiring harness
connector
Connecting parts among common rail pressure sensor, engine wir-
ing 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
6 Defective engine controller
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
J1 Voltage
Between (37) – (47) Power supply 4.75 – 5.25 V
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