Komatsu BR380JG-1E0, Shop Manual, Page: 630 / 841

SEN02093-00 40 Troubleshooting
20
BR380JG-1E0
Failure code [CA449] Common rail pressure sensor too high (2) 1
User code Failure code
Trouble
Common rail pressure sensor too high (2)
(Engine controller system)
E11 CA449
Contents of
trouble
• There is high pressure error in common rail circuit.
Action of
controller
• Limits output and continues operation.
Problem that
appears on
machine
• Engine sound becomes large when no or light load is applied.
• Engine output lowers.
Related
information
• Common rail pressure can be checked with monitoring function.
(Code: 36400 , Rail Pressure)
• Method of reproducing failure code: Start engine.
Possible
causes and
standard value
in normal state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defect in related
system
If another failure code is displayed, carry out troubleshooting for it.
2
Air in low pressure
circuit
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.
3
Defect in fuel return
circuit parts
a
For check of fuel return circuit pressure, see Testing and adjusting,
Checking fuel pressure.
Fuel return circuit
pressure
Low idle running or
cranking
Max. 0.02 MPa
{Max. 0.19 kg/cm 2 }
4
Defective common rail
pressure sensor
a
Prepare with engine starting switch ON, then keep engine starting
switch ON and carry out troubleshooting in each case.
Monitoring code
(Machine monitor)
Monitoring information
36400
Common rail
pressure
While engine is stopped
0 ± 0.39 MPa
{0 ± 4 kg/cm 2 }
5
Defective pressure
limiter
a
For check of leakage through pressure limiter, see Testing and adjust-
ing, Checking fuel return rate and leakage.
Leakage through pres-
sure limiter
During low idle 0 cc (No leakage)
6 Defective supply pump If causes 1 – 5 are not detected, supply pump may be defective.