Failure Code [Ca451] Rail Press. Sensor High Error - Komatsu Galeo PC138US-8 Shop Manual

SEN02464-01

Failure code [CA451] Rail press. sensor high error

User code Failure code
E11
Contents of
• High voltage was detected in common rail pressure sensor circuit.
trouble
Action of
• Limits output and continues operation (Limits common rail pressure).
controller
Problem that
appears on
• Output drops.
machine
• Signal voltage of common rail pressure sensor can be checked with monitoring function.
Related
(Code: 36401 Common rail pressure sensor voltage)
information
• Method of reproducing failure code: Turn starting switch ON.
Defective sensor power sup-
1
ply system
Defective common rail pres-
2 sure sensor
(Internal trouble)
Possible causes
and standard
Disconnection in wiring har-
value in normal
ness
state
3 (Disconnection in wiring or
defective contact in connec-
tor)
Ground fault in wiring har-
ness
4
(Short circuit with GND cir-
cuit)
14
Trouble
CA451
Causes
Rail press. sensor high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA352] or [CA386] is indicated, carry out trouble-
shooting for it first.
a Prepare with starting switch OFF, then turn starting switch ON
or start engine and carry out troubleshooting.
PFUEL
Between (1) – (3)
Between (2) – (3)
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.
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (36)
– PFUEL (female) (1)
Wiring harness between CE01 (female) (29)
– PFUEL (female) (2)
Wiring harness between CE01 (female) (48)
– PFUEL (female) (3)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (36)
– PFUEL (female) (1) and chassis ground
Wiring harness between CE01 (female) (29)
– PFUEL (female) (2) and chassis ground
Wiring harness between CE01 (female) (48)
– PFUEL (female) (3) and chassis ground
40 Troubleshooting
Power supply 4.75 – 5.25 V
Signal 0.25 – 4.6 V
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
PC138US, USLC-8
1
Voltage
Max. 1 z
Max. 1 z
Max. 1 z
Min.1 Mz
Min.1 Mz
Min.1 Mz