Failure Code [Ca123] Chg Air Press Sensor Low Error - Komatsu PC210-8 Shop Manual

UEN00240-01

Failure code [CA123] Chg Air Press Sensor Low Error

User code Failure code
E11
Contents of
• Pressure signal circuit of boost pressure/temperature sensor detected low voltage.
trouble
Action of
• Fixes charge pressure value and continues operation.
controller
Problem that
appears on
• Engine output lowers.
machine
• Signal voltage on boost pressure side of boost pressure/temperature sensor can be checked with
Related infor-
monitoring function. (Code: 36501 Boost pressure sensor voltage)
mation
• Method of reproducing failure code: Turn starting switch ON.
Defective sensor power sup-
1
ply 2 system
Defective boost pressure/
2 temperature sensor [pres-
sure signal system]
Ground fault in wiring har-
3 ness (Short circuit with GND
circuit)
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
26
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.
BOOST PRESS & IMT
Between (3) – (1)
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 troubleshooting
without turning starting switch ON.
Wiring harness between CE01 (female) (44)
– BOOST PRESS & IMT (female) (4)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between CE01 (female) (44)
– BOOST PRESS & IMT (female) (4) and
between CE01 (female) (47) – JC02 –
BOOST PRESS & IMT (female) (1)
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
PC210, 230, 240-8
1
Voltage
Min. 100
kz
Min. 100
kz
Voltage