SEN03842-00
40-320 26 WA250, 250PZ-6
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA221] Atmospheric pressure sensor high error
Failure code [CA221] Atmospheric pressure sensor high error 1
Action code Failure code
Trouble
Ambient pressure sensor high error
(Engine controller system)
E01 CA221
Contents of
trouble
• High voltage is detected in atmospheric pressure sensor
Action of
controller
• Fixes atmospheric pressure and continues operation.
Problem that
appears on
machine
• Engine does not start easily.
• Engine output drops.
Related
information
• The input state (atmospheric pressure) from the atmospheric pressure sensor can be checked with
the monitoring function (Code: ENGINE, 37400, AMBIENT PRESS).
• The input state (voltage) from the atmospheric pressure sensor can be checked with the monitoring
function (Code: ENGINE, 37402, AMBIENT PRESS).
• Method of reproducing failure code: Turn the starting switch ON.
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective sensor power sup-
ply 1 system
If failure code [CA386] is indicated simultaneously, carry out trouble-
shooting for it first.
2
Defective atmospheric pres-
sure sensor (Internal trouble)
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
AMBAIR PRESSURE Voltage
Between (1) and (2) Power supply 4.75 – 5.25 V
Voltage is measured with wiring harness connected. Accordingly, if
voltage is abnormal, check wiring harness and controller, too, for
another cause of trouble, and then judge.
3
Hot short (Short circuit with
5V, 24V circuit) in wiring har-
ness
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between EC1 (female) (3) –
AMBAIR PRESSURE (female) (3) and
ground
Voltage Max. 1 V
4
Short circuit in wiring har-
ness
(with another wiring harness)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC1 (female) (3) –
AMBAIR PRESSURE (female) (3), EC1
(female) (33) – AMBAIR PRESSURE
(female) (1)
Resis-
tance
Min.
100 kz
5
Defective wiring harness
connector
Connecting parts among atmospheric pressure sensor, engine wir-
ing harness, and engine controller are suspected. Inspect them
directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
6 Defective engine controller
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
EC1 Voltage
Between (33) and
(38)
Power supply 4.75 – 5.25 V
To Next Page
Loading...
Need help?
General
