Code [452/Ca452] Rail Press. Sensor Low Error - Komatsu 114E-3 Series Shop Manual

SEN00460-01
E-40 Code [452/CA452] Rail Press. Sensor Low Error
Error code Failure code
452
Contents of
• Low voltage occurred in common rail pressure sensor.
trouble
Action of con-
• Limits output and continues operation.
troller
Problem that
• Engine speed or output drops.
appears on
• Engine does not start
machine
Related infor-
• Method of reproducing failure code: Starting switch ON.
mation
Defective sensor power sup-
1
ply 2 system
Defective common rail pres-
2
sure sensor
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
CA452
Causes
Abnormally low level in common rail pressure sensor
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) – (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 J1 (female) (25) –
FUEL RAIL PRESS (female) (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J1 (female) (25) –
FUEL RAIL PRESS (female) (2) and J1
(female) (47) – FUEL RAIL PRESS (female)
(1)
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.
J1
Between (37) – (47)
40 Troubleshooting
Power supply 4.75 – 5.25 V
Resis-
tance
Resis-
tance
Power supply 4.75 – 5.25 V
114E-3 Series
1
Voltage
Min.
100 kz
Min.
100 kz
Voltage