Komatsu 80001 User Manual

SEN04120-03 40 Troubleshooting
14 PC130-8
Failure code [CA451] Rail press. sensor high error 1
User code Failure code
Trouble
Rail press. sensor high error
(Engine controller system)
E11 CA451
Contents of
trouble
• High voltage was detected in common rail pressure sensor circuit.
Action of
controller
• Limits output and continues operation (Limits common rail pressure).
Problem that
appears on
machine
• Output drops.
Related
information
• Signal voltage of common rail pressure sensor can be checked with monitoring function.
(Code: 36401 Common rail pressure sensor voltage)
• Method of reproducing failure code: Turn 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 system
If failure code [CA352] or [CA386] is indicated, carry out trouble-
shooting for it first.
2
Defective common rail pres-
sure sensor
(Internal trouble)
a Prepare with starting switch OFF, then turn starting switch ON
or start engine and carry out troubleshooting.
PFUEL Voltage
Between (3) – (1) Power supply 4.75 – 5.25 V
Between (2) – (1) Signal 0.25 – 4.6 V
Sensor voltage is measured with wiring harness connected.
Accordingly, if voltage is abnormal, check wiring harness and con-
troller, too, for another cause of trouble, and then judge.
3
Disconnection in wiring har-
ness
(Disconnection in wiring or
defective contact in connec-
tor)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between ENG1 (female)
(36) – PFUEL (female) (3)
Resis-
tance
Max. 1 z
Wiring harness between ENG1 (female)
(29) – PFUEL (female) (2)
Resis-
tance
Max. 1 z
Wiring harness between ENG1 (female)
(48) – PFUEL (female) (1)
Resis-
tance
Max. 1 z
4
Ground fault in wiring har-
ness
(Short circuit with GND cir-
cuit)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between ENG1 (female)
(36) – PFUEL (female) (3) and chassis
ground
Resis-
tance
Min.1 Mz
Wiring harness between ENG1 (female)
(29) – PFUEL (female) (2) and chassis
ground
Resis-
tance
Min.1 Mz
Wiring harness between ENG1 (female)
(48) – PFUEL (female) (1) and chassis
ground
Resis-
t
ance
Min.1 Mz

Komatsu 80001 Specifications

General

Brand	Komatsu
Model	80001
Category	Excavators
Language	English