Failure Code [Ca452] Common Rail Pressure Sensor Low Error - Komatsu WA250-6 Shop Manual

SEN03843-00

Failure code [CA452] Common rail pressure sensor low error

Action code Failure code
E03
Contents of
• Low voltage occurred in common rail pressure sensor.
trouble
Action of • Limits output and continues operation.
controller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
• The engine does not start.
appears on
• Engine speed or output drops.
machine
• The input state (common rail pressure) from the common rail pressure sensor can be checked with
the monitoring function (Code: ENGINE, 36400, RAIL PRESS).
Related
• The input state (voltage) from the common rail pressure sensor can be checked with the monitoring
information
function (Code: ENGINE, 36402, RAIL PRESS).
• Method of reproducing failure code: Turn the starting switch ON.
Defective sensor power sup-
1
ply 2 system
Defective common rail pres-
2
sure sensor
Ground fault in wiring har-
3 ness
(Contact with ground circuit)
Possible causes
and standard
value in normal
Short circuit in wiring har-
state
4 ness
(with another wiring harness)
Defective wiring harness
5
connector
6 Defective engine controller
26
40-330
Trouble
CA452
Causes
330 Troubleshooting by failure code (Display of code), Part 3
Failure code [CA452] Common rail pressure sensor low error
Common rail pressure sensor low error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA187] is indicated simultaneously, carry out trouble-
shooting for it first.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
FUEL RAIL PRESS
Between (3) and (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 turn starting switch ON
and carry out troubleshooting.
Wiring harness between EC1 (female) (25) –
FUEL RAIL PRESS (female) (2) and ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC1 (female) (25) –
FUEL RAIL PRESS (female) (2), EC1
(female) (37) – FUEL RAIL PRESS (female)
(3)
Connecting parts among common rail 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
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
EC1
Between (37) and
(47)
Power supply 4.75 – 5.25 V
Resis-
tance
Resis-
tance
Power supply 4.75 – 5.25 V
WA250, 250PZ-6
1
Voltage
Min.
100 kz
Min.
100 kz
Voltage