Failure Code [Ca451] Rail Press Sensor High Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02630-05

Failure code [CA451] Rail Press Sensor High Error

Action code Failure code
E11
Contents of
• There is high voltage in signal circuit of common rail pressure sensor.
trouble
Action of con-
• Limits output and continues operation.
troller
Problem that
• Engine speed or output lowers.
appears on
• Engine does not start.
machine
Related infor-
• Method of reproducing failure code: Turn starting switch ON.
mation
Defective sensor power sup-
1
ply 2 system
Defective common rail pres-
2
sure sensor
Possible causes
Disconnection in wiring harness
and standard
3 (Disconnection in wiring or
value in normal
defective contact in connector)
state
Defective wiring harness
4
connector
5 Defective engine controller
24
Trouble
CA451
Cause
Common rail pressure sensor high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA227] is also indicated, carry out troubleshooting
for it first.
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
C8 (male)
Between (3) – (1)
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.
a
Prepare with starting switch OFF, then keep starting switch
OFF and carry out troubleshooting.
Wiring harness between CE01 (female) (25) –
C8 (female) (2)
Wiring harness between CE01 (female) (37) –
C8 (female) (3)
Wiring harness between CE01 (female) (47) –
C8 (female) (1)
Connecting parts between common rail pressure sensor – engine
wiring harness – engine controller may be defective. Check them
directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CE01
Between (37) – (47)
40 Troubleshooting
Power supply 4.75 – 5.25 V
Resis-
tance
Resis-
tance
Resis-
tance
Power supply 4.75 – 5.25 V
PC300, 350-8
1
Voltage
Max. 1 z
Max. 1 z
Max. 1 z
Voltage