Failure Code [Ca451] Rail Press Sensor High Error - Komatsu Galeo PC800-8 Shop Manual

SEN00791-02

Failure code [CA451] Rail Press Sensor High Error

Action code Failure code
E11 CA451
Contents of
• High pressure error occurred in common rail pressure sensor circuit.
trouble
Action of
• Limits output and continues operation (limits common rail pressure).
controller
Problem that
appears on • Engine output lowers.
machine
Related • The signal voltage of the common rail pressure sensor can be checked with the monitoring function
information (Code: 36401 Common rail pressure sensor voltage).
Defective sensor power
1
supply system
Defective common rail
2 pressure sensor
(Internal defect)
Disconnection in wiring har-
ness
3 (Disconnection in wiring or
defective contact in con-
nector)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
ness
4
(Short circuit with GND cir-
cuit)
Short circuit in wiring har-
ness
5
(with another wiring har-
ness)
6
Rail Press Sensor High Error
Trouble
(Engine controller system)
Cause
If failure code [CA352] or [CA386] is displayed, carry out troubleshoot-
ing for it first.
aPrepare with starting switch OFF, then turn starting switch ON or start
engine and carry out troubleshooting.
Between (1) – (3)
Between (2) – (3)
Sensor voltage is measured with wiring harness connected. Accord-
ingly, if voltage is abnormal, check wiring harness and controller, too, for
another cause of trouble, and then judge.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (33) –
PFUEL (female) (1)
Wiring harness between ENG (female) (25) –
PFUEL (female) (2)
Wiring harness between ENG (female) (47) –
PFUEL (female) (3)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (33) –
PFUEL (female) (1) and chassis ground
Wiring harness between ENG (female) (25) –
PFUEL (female) (2) and chassis ground
Wiring harness between ENG (female) (47) –
PFUEL (female) (3) and chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (33) –
PFUEL (female) (1) and between ENG
(female) (25) – PFUEL (female) (2)
Wiring harness between ENG (female) (33) –
PFUEL (female) (1) and between ENG
(female) (47) – PFUEL (female) (3)
Wiring harness between ENG (female) (25) –
PFUEL (female) (2) and between ENG
(female) (47) – PFUEL (female) (3)
Standard value in normal state/Remarks on troubleshooting
PFUEL
Power supply
40 Troubleshooting
Voltage
4.75 – 5.25 V
Signal 0.25 – 4.6 V
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Max. 1 z
Max. 1 z
Max. 1 z
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
PC800, 850-8