Failure Code [Ca449] Rail Press Very High Error - Komatsu PC200-8M0 Shop Manual

302 Troubleshooting by failure code, Part 2

Failure code [CA449] Rail Press Very High Error

Failure code [CA449] Rail Press Very High Error

Action
Failure code
level
L03 CA449
q
Detail of failure High pressure error (2) occurs in common rail circuit.
Action of con-
q
Restricts engine output and allows engine to run.
troller
q
Problem on Engine sound becomes large when no or light load is applied.
machine q Engine output lowers.
q Common rail pressure can be checked with monitoring function.
Related infor-
(Code: 36400 Common rail pressure)
mation
q
Method of reproducing failure code: Start engine.
Cause
1 Defect in related system
2 Air in low pressure circuit
3 Defect in fuel return circuit parts
Defective common rail pressure
4
sensor system
5 Defective pressure limiter
6 Defective supply pump
PC200, 200LC, 220, 220LC-8M0
Common Rail Pressure Very High Error
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
If another failure code is displayed, perform troubleshooting for it.
Air may be in low-pressure circuit. Check it directly according to following pro-
cedure.
1. Remove fuel pressure pickup port plug (outlet side) of fuel main filter.
2. Operate feed pump of fuel pre-filter.
3. Check fuel and air from pressure pickup plug for leakage level.
a For check of pressure in fuel return circuit, see Testing and adjusting, "Test-
ing fuel pressure".
Fuel return circuit pres-
sure
Perform troubleshooting for failure codes [CA451] and [CA452]
a For check of leakage from pressure limiter, see "Checking fuel return rate
and leakage" in Testing and adjusting.
Leakage from pressure
limiter
If no failure is found by above checks, supply pump may be defective.
Engine at low idle or
cranking
At low idle
SEN06134-00
Max. 0.02 MPa
2
{Max. 0.19 kg/cm }
0 cc (no leakage)
31
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