Failure Code [Ca221] Ambient Air Press. Sensor High Error - Komatsu Galeo PC138US-8 Shop Manual

SEN02463-01

Failure code [CA221] Ambient air press. sensor high error

User code Failure code
E11
Contents of
• High voltage was detected in ambient pressure sensor circuit.
trouble
Action of • Sets atmospheric pressure sensor to default value (52.44 kPa {0.53 kg/cm
controller tion.
Problem that
appears on • Output drops.
machine
• Signal voltage of ambient pressure sensor can be checked with monitoring function.
Related
(Code: 37401 Ambient pressure sensor voltage)
information
• Method of reproducing failure code: Turn starting switch ON.
Defective sensor power sup-
1
ply system
Defective atmospheric 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)
26
Trouble
CA221
Causes
Ambient air press. sensor high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA187] or [CA227] is indicated, carry out trouble-
shooting for it first.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
PAMB
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)
– PAMB (female) (1)
Wiring harness between CE01 (female) (20)
– PAMB (female) (2)
Wiring harness between CE01 (female) (48)
– PAMB (female) (3)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (36)
– PAMB (female) (1) and chassis ground
Wiring harness between CE01 (female) (20)
– PAMB (female) (2) and chassis ground
Wiring harness between CE01 (female) (48)
– PAMB (female) (3) and chassis ground
40 Troubleshooting
2
}) and continues opera-
Power supply 4.75 – 5.25 V
Signal 0.3 – 4.7 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