Failure Code [Ca227] Sens Supply 2 Volt High Error - Komatsu Galeo PC800-8 Shop Manual

SEN00790-02

Failure code [CA227] Sens Supply 2 Volt High Error

Action code Failure code
E15 CA227
Contents of
• High voltage error occurred in sensor power supply 2 (5V) circuit.
trouble
• Engine Bkup speed sensor operates with signal from engine Ne speed sensor.
• Oil pressure sensor sets oil pressure to default (250 kPa {2.5 kg/cm
• Ambient pressure sensor sets ambient pressure to default (52.44 kPa {0.53 kg/cm
operation.
Action of
• Charge air pressure sensor fixes charge pressure at 400 kPa {4.1 kg/cm
controller
• EGR inlet pressure sensor sets EGR inlet pressure to default (102 kPa {1.0 kg/cm
operation.
• EGR valve lift sensor limits output, and closes EGR and bypass valves.
• Bypass valve lift sensor limits output, and closes EGR and bypass valves.
Problem that
appears on • Engine output lowers.
machine
Related
information
1 Defect in related system
Defective sensor
2
(Internal defect)
Possible causes
and standard
value in normal
state
Disconnection in wiring
harness
3 (Disconnection in wiring or
defective contact in con-
nector)
Ground fault in wiring har-
ness
4
(Short circuit with GND cir-
cuit)
* Connector "PEVA" is not applied to the following machines:
• PC800-8: 55001 and up
• PC850-8: 10007, 55001 and up
44
Sens Supply 2 Volt High Error
Trouble
(Engine controller system)
Cause Standard value in normal state/Remarks on troubleshooting
If another failure code is displayed, carry out troubleshooting for it.
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Disconnect sensors at
right in order. If no
error code is displayed,
that sensor is defec-
tive.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (37) –
each sensor (female)
Wiring harness between ENG (female) (47) –
each sensor (female)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (37) –
each sensor (female) and chassis ground
Wiring harness between ENG (female) (47) –
each sensor (female) and chassis ground
40 Troubleshooting
2
}) and continues operation.
2
} and continues operation.
Bkup Speed Sensor
Oil pressure sensor
Ambient pressure sen-
sor
Charge air pressure
sensor
EGR inlet pressure
sensor
EGR valve lift sensor
Bypass valve lift sen-
sor
2
}) and continues
2 }) and continues
G connector
POIL connector
PAMB connector
PIM connector
PEVA connector
SEGR connector
SBP connector
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
PC800, 850-8