Komatsu 114E-3 Series - E-38 Code [449;CA449] Rail Press. High Error 2

SEN00460-01 40 Troubleshooting
22 114E-3 Series
E-38 Code [449/CA449] Rail Press. High Error 2 1
Error code Failure code
Trouble Abnormally high common rail pressure 2
449 CA449
Contents of trou-
ble
• Voltage (2) in common rail circuit is abnormally high.
Action of control-
ler
• Limits output and continues operation.
Problem that
appears on
machine
• Engine output drops.
Related informa-
tion
• Method of reproducing failure code: Start engine.
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1 Defective related system If another failure code is indicated, carry out troubleshooting for it.
2 Air in low-pressure circuit
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.
3
Defective fuel low-pressure
circuit device
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
At high idle (When
engine can be started)
Min. 0.48 MPa
{Min. 4.9 kg/cm
2
}
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
At high idle
Max. 0.14 MPa
{Max. 1.4 kg/cm
2
}
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)
At high idle
Max. 33.9 kPa
{Max. 254 mmHg}
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)
At high idle
Max. 27.1 kPa
{Max. 203 mmHg}
4 Defective fuel cooler
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.
5
Defective common rail pres-
sure sensor
a Prepare with starting switch OFF, then turn starting switch ON and
carry out troubleshooting.
Monitoring on INSITE Monitoring information
Common rail pressure
Condition when
engine stopped
0 ± 0.39 MPa
{0 ± 4 kg/cm
2
}