Failure Code [Ca221] Ambient Press Sens High Error - Komatsu PC210-8 Shop Manual

UEN00240-01

Failure code [CA221] Ambient Press Sens High Error

User code Failure code
E11
Contents of
• High voltage was detected in signal circuit of ambient pressure sensor.
trouble
Action of
• Fixes ambient pressure value and continues operation.
controller
Problem that
• Engine does not start easily.
appears on
• Engine output lowers.
machine
• Signal voltage of ambient pressure sensor can be checked with monitoring function. (Code: 37401
Related infor-
Ambient pressure sensor voltage
mation
• Method of reproducing failure code: Turn starting switch ON.
Defective sensor power sup-
1
ply 1 system
Defective ambient pressure
2
sensor
Hot short (Short circuit with
3 5V/24V circuit) in wiring har-
ness
Possible causes
and standard
value in normal
state
Short circuit in wiring har-
4 ness (with another wiring
harness)
Defective wiring harness
5
connector
6 Defective engine controller
44
Trouble
CA221
Cause
Ambient pressure sensor high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA386] is also indicated, carry out troubleshooting
for it first.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
AMBAIR PRESURE
Between (1) – (2)
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.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between CE01 (female) (3) –
AMBAIR PRESSURE (female) (3)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between CE01 (female) (3) –
AMBAIR PRESSURE (female) (3) and
between CE01 (female) (33) – AMBAIR
PRESSURE (female) (1)
Connecting parts between ambient pressure sensor – engine wiring
harness – engine controller may be defective. Check them directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CE01
Between (33) – (38)
40 Troubleshooting
Power supply 4.75 – 5.25V
Voltage
Resis-
tance
Voltage 4.75 – 5.25 V
PC210, 230, 240-8
1
Voltage
Max. 1 V
Min. 100
kz
Voltage