Failure Code [Ca449] Rail Press Very High Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02630-05

Failure code [CA449] Rail Press Very High Error

Action code Failure code
E11
Contents of
• There is high pressure error (2) in common rail circuit.
trouble
Action of con-
• Limits output and continues operation.
troller
Problem that
appears on • Engine output lowers.
machine
Related infor-
• Method of reproducing failure code: Start engine.
mation
1 Defect in related system
2 Air in low pressure circuit
Possible causes
and standard
value in normal
state
Defect in fuel low pressure
3
circuit parts
4 Defective fuel cooler
20
Trouble
CA449
Cause
Common rail pressure very high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If another failure code is displayed, carry out troubleshooting for it,
too.
There may be air in low pressure circuit. Check it directly according
to the following procedure.
1) Remove pressure pickup plug (outlet side) of fuel main filter.
2) Operate feed pump of fuel pre-filter.
3) Check pressure pickup plug for leakage of fuel and air.
• If this error occurs during air bleeding after the fuel filter was
replaced, air may remain in the fuel circuit. Keep running the
engine at low idle for about three minutes. As air is bled from the
fuel circuit, the engine speed will be stabilized, erasing the error
indication.
a
For check of pressure in fuel low pressure circuit, see Testing
and adjusting, Checking fuel pressure.
• Measured in fuel filter outlet side.
Pressure in fuel low-
pressure circuit
a
For check of pressure in fuel low pressure circuit, see Testing
and adjusting, Checking fuel pressure.
• Measured in fuel filter inlet and outlet sides.
• Pressure drop in fuel low-pressure circuit = Fuel filter inlet pres-
sure – Fuel filter outlet pressure
Pressure drop in fuel
low-pressure circuit
a
For check of fuel suction pressure, see Testing and adjusting,
Checking fuel pressure.
• Measured in gear pump fuel inlet side of supply pump.
Fuel suction circuit
pressure
(gear pump side)
a
For check of fuel return circuit pressure, see Testing and
adjusting, Checking fuel pressure.
Fuel suction circuit
pressure
(fuel connector side)
a
Directly check for fuel leakage from fuel tube of fuel cooler, O-
ring, seal washer damage, and check valve clogging or dam-
age.
40 Troubleshooting
During high idle
Max. 0.48 MPa
(if engine can be
{Max. 4.9 kg/cm
started)
Max. 0.14 MPa
During high idle
{Max. 1.4 kg/cm
Max. 33.9 kPa
During high idle
{Max. 254 mmHg}
Max. 27.1 kPa
During high idle
{Max. 203 mmHg}
1
2 }
2 }
PC300, 350-8