Failure Code [Ca222] Ambient Press Sens Low Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02629-03

Failure code [CA222] Ambient Press Sens Low Error

Action code Failure code
E11
Contents of
• Low voltage was detected in signal circuit of ambient pressure sensor.
trouble
Action of con-
• Fixes ambient pressure value and continues operation.
troller
Problem that
• Engine output lowers.
appears on
• Engine starting performance becomes deteriorated.
machine
Related infor-
• Method of reproducing failure code: Turn starting switch ON.
mation
Defective sensor power sup-
1
ply 1 system
Defective ambient pressure
2
sensor
Ground fault in wiring har-
ness
3
(Short circuit with GND cir-
Possible causes
and standard cuit)
value in normal
state
Short circuit in wiring har-
4 ness
(with another wiring harness)
Defective wiring harness
5
connector
6 Defective engine controller
42
Trouble
CA222
Cause
Ambient pressure sensor low error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA352] is also indicated, carry out troubleshooting
for it first.
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
C29
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 carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (3) –
C29 (female) (3) and chassis ground
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (3) –
C29 (female) (3) and between CE01
(female) (38) – JC03 – C29 (female) (2)
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 – 5.25 V
Resis-
tance
Resis-
tance
Power supply 4.75 – 5.25 V
PC300, 350-8
1
Voltage
Min.
100 kz
Min.
100 kz
Voltage