Failure Code [Ca123] Chg Air Press Sensor Low Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02629-03

Failure code [CA123] Chg Air Press Sensor Low Error

Action code Failure code
E11
Contents of
• Pressure signal circuit of boost pressure, temperature sensor detected low voltage.
trouble
Action of con-
• Fixes charge pressure value and continues operation.
troller
Problem that
appears on • Engine output lowers.
machine
Related infor-
• Method of reproducing failure code: Turn starting switch ON.
mation
Defective sensor power sup-
1
ply 2 system
Defective boost pressure,
2 temperature sensor [pres-
sure signal system]
Ground fault in wiring har-
ness
3
(Short circuit with GND cir-
Possible causes
cuit)
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
22
Trouble
CA123
Cause
Charge air pressure sensor low error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA187] is also indicated, carry out troubleshooting
for it first.
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
C4
Between (1) – (4)
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) (44)
– C4 (female) (1) and chassis ground
a
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (44)
– C4 (female) (1) and between CE01
(female) (47) – C4 (female) (2)
Connecting parts between boost pressure, temperature 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 (37) – (47)
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