Failure Code [Ca221] Ambient Press Sens High Error - Komatsu Galeo PC800-8 Shop Manual

SEN00790-02

Failure code [CA221] Ambient Press Sens High Error

Action code Failure code
E11 CA221
Contents of
• High pressure error occurred in ambient pressure sensor circuit.
trouble
Action of
• Sets ambient pressure to default (52.44 kPa {0.53 kg/cm
controller
Problem that
appears on • Engine output lowers.
machine
• The signal voltage of the atmospheric pressure sensor can be checked in monitoring mode.
Related
(Code: 37401 Atmospheric pressure sensor voltage)
information
• Duplication of failure code: turn ON the starting switch.
Defective sensor power
1
supply system
Defective ambient pressure
2 sensor
(Internal defect)
Disconnection in wiring har-
ness
3 (Disconnection in wiring or
defective contact in connec-
tor)
Possible causes
and standard
Ground fault in wiring har-
value in normal
ness
state
4
(Short circuit with GND cir-
cuit)
Short circuit in wiring har-
ness
5
(with another wiring har-
ness)
6 Defective engine controller
40
Ambient Press Sens High Error
Trouble
(Engine controller system)
Cause Standard value in normal state/Remarks on troubleshooting
If failure code [CA187] or [CA227] is displayed, carry out troubleshoot-
ing for it first.
aPrepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Between (1) – (2)
Between (3) – (2)
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) (37) –
PAMB (female) (1)
Wiring harness between ENG (female) (38) –
PAMB (female) (2)
Wiring harness between ENG (female) (3) –
PAMB (female) (3)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Between wiring harness of ENG (female) (37) –
PAMB (female) (1) and chassis ground
Between wiring harness of ENG (female) (38) –
PAMB (female) (2) and chassis ground
Between wiring harness of ENG (female) (3) –
PAMB (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) (37) –
PAMB (female) (1) and between ENG (female)
(38) – PAMB (female) (2)
Wiring harness between ENG (female) (37) –
PAMB (female) (1) and between ENG (female)
(3) – PAMB (female) (3)
Wiring harness between ENG (female) (38) –
PAMB (female) (2) and between ENG (female)
(3) – PAMB (female) (3)
aPrepare with starting switch OFF, then turn starting switch ON or start
engine and carry out troubleshooting.
2
}) and continues operation.
PAMB
Voltage
Signal
ENG
Between (37) – (38)
Between (3) – (38)
40 Troubleshooting
Voltage
4.75 – 5.25 V
0.5 – 4.5 V
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage
4.75 – 5.25 V
0.5 – 4.5 V
PC800, 850-8