Code [449/Ca449] Rail Press. High Error 2 - Komatsu 114E-3 Series Shop Manual

SEN00460-01
E-38 Code [449/CA449] Rail Press. High Error 2
Error code Failure code
449
Contents of trou-
• Voltage (2) in common rail circuit is abnormally high.
ble
Action of control-
• Limits output and continues operation.
ler
Problem that
appears on • Engine output drops.
machine
Related informa-
• Method of reproducing failure code: Start engine.
tion
1 Defective related system
2 Air in low-pressure circuit
Possible causes
and standard
value in normal
Defective fuel low-pressure
3
state
circuit device
4 Defective fuel cooler
Defective common rail pres-
5
sure sensor
22
Trouble Abnormally high common rail pressure 2
CA449
Causes Standard value in normal state/Remarks on troubleshooting
If another failure code is indicated, carry out troubleshooting for it.
Inspect it for air entry directly according to the following procedure.
1) Remove pressure pickup plug (outlet side) from fuel main filter.
2) Operate feed pump of fuel pre-fuel filter.
3) Inspect fuel and air from pressure pickup plug for leakage level.
• If this error occurs during bleeding air after replacement of the fuel
filter, air left in the fuel circuit is suspected. Continue engine oper-
ation at low idle approximately 3 minutes. When air is bled from
the fuel circuit, engine speed becomes stable and the error indica-
tion disappears.
a For check of pressure in fuel low-pressure circuit, see Testing and
adjusting, "Testing fuel pressure."
• Measure at fuel filter outlet side.
Pressure in fuel low-
pressure circuit
a For check of pressure in fuel low-pressure circuit, see Testing and
adjusting, "Testing fuel pressure."
• Measure at fuel filter inlet and outlet sides.
• Difference of pressure in front and rear part of filter = Fuel filter
inlet pressure – Fuel filter outlet pressure
Difference of pressure in
front and rear part of filter
a For check of fuel suction pressure, see Testing and adjusting,
"Testing fuel pressure."
• Measure at gear pump fuel inlet side of supply pump.
Fuel suction circuit pres-
sure (Gear pump side)
a For check of fuel suction pressure, see Testing and adjusting,
"Testing fuel pressure."
• Measure at fuel connector side.
Fuel suction circuit pres-
sure (Fuel connector
side)
a Inspect fuel tube of fuel cooler for fuel leakage, O-ring and seal
washer for damage, and check valve for clogging or damage
directly.
a Prepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Monitoring on INSITE
Common rail pressure
40 Troubleshooting
At high idle (When
engine can be started)
{Min. 4.9 kg/cm
At high idle
{Max. 1.4 kg/cm
At high idle
{Max. 254 mmHg}
At high idle
{Max. 203 mmHg}
Monitoring information
Condition when
engine stopped
1
Min. 0.48 MPa
2
}
Max. 0.14 MPa
2
}
Max. 33.9 kPa
Max. 27.1 kPa
0 ± 0.39 MPa
{0 ± 4 kg/cm 2 }
114E-3 Series