Komatsu PC210-8, Shop Manual

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UEN00241-01 40 Troubleshooting
24
PC210, 230, 240-8
Failure code [CA452] Rail Press Sensor Low Error 1
User code Failure code
Trouble
Common rail pressure sensor low error
(Engine controller system)
E11 CA452
Contents of
trouble
• There is low voltage in signal circuit of common rail pressure sensor.
Action of
controller
• Limits output and continues operation.
Problem that
appears on
machine
• Engine does not start.
• Engine speed or output lowers.
Related infor-
mation
• Signal voltage of common rail pressure sensor can be checked with monitoring function.
(Code: 36401 Common rail pressure sensor voltage)
• Method of reproducing failure code: Turn starting switch ON.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective sensor power sup-
ply 2 system If failure code [ CA187 ] is also displayed, carry out troubleshooting
for it first.
2
Defective common rail pres-
sure sensor
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
FUEL RAIL PRESS Voltage
Between (3) – (1) 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
Ground fault in wiring har-
ness (Short circuit with GND
circuit)
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between CE01 (female) (25)
– FUEL RAIL PRESS (female) (2) Resis-
tance
Min. 100
k
z
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 CE01 (female) (25)
– FUEL RAIL PRESS (female) (2) and
between CE01 (female) (47) – JC02 – FUEL
RAIL PRESS (female) (1)
Resis-
tance
Min. 100
k
z
5
Defective wiring harness
connector
Connecting parts between common rail 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
6 Defective engine controller
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CE01 Voltage
Between (37) – (47) Power supply 4.75 – 5.25 V