Komatsu 114E-3 Series - E-13 Code [221;CA221] Ambient Air Press. Sensor High Error

SEN00459-01 40 Troubleshooting
24 114E-3 Series
E-13 Code [221/CA221] Ambient Air Press. Sensor High Error 1
Error code Failure code
Trouble Abnormally high level in atompspheric
221 CA221
Contents of
trouble
• High voltage is detected in atmospheric pressure sensor
Action of con-
troller
• Fixes atmospheric pressure and continues operation.
Problem that
appears on
machine
• Engine output drops.
• Starting performance is poor.
Related infor-
mation
• Method of reproducing failure code: 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
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
AMBAIR PRESSURE Voltage
Between (1) – (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 J1 (female) (3) –
AMBAIR PRESSURE (female) (3)
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 J1 (female) (3) –
AMBAIR PRESSURE (female) (3) and J1
(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.
J1 Voltage
Between (33) – (38) Power supply 4.75 – 5.25 V