Komatsu 75001, Shop Manual

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SEN03843-00
40-330
30
WA250, 250PZ-6
330 Troubleshooting by failure code (Display of code), Part 3
Failure code [CA559] Supply pump pressure very low error
Failure code [CA559] Supply pump pressure very low error
1
Action code Failure code
Trouble
Supply pump pressure very low error
(Engine controller system)
E03 CA559
Contents of
trouble
• No-pressure feed (1) occurred in common rail circuit.
Action of
controller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
appears on
machine
• Engine does not start or starting performance is poor
• Exhaust smoke is black.
• Engine output drops.
Related
information
• The input state (common rail pressure) from the common rail pressure sensor can be checked with
the monitoring function (Code: ENGINE, 36400, RAIL PRESS).
• The input state (voltage) from the common rail pressure sensor can be checked with the monitoring
function (Code: ENGINE, 36402, RAIL PRESS).
• 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 Fuel leakage to outside
Inspect for fuel leakage directly (visual inspection at engine low
idle).
2
Defective low-pressure cir-
cuit device
a For check of pressure in fuel low-pressure circuit, see Testing and
adjusting, “Testing fuel pressure”.
Pressure in fuel low-
pressure circuit
Cranking
(When starting is not
available)
0.3 – 1.1 MPa
{3.1 – 11.3 kg/cm
2
}
At low idle
(When starting is
available)
0.5 – 1.3 MPa
{5.1 – 13.3 kg/cm
2
}
3 Defective pressure limiter
For testing of leakage from pressure limiter, see Testing and adjust-
ing, “Testing leakage from pressure limiter and return rate from
injector”.
Leakage from pres-
sure limiter
At low idle 0 cc (No leakage)
4
Defective injector
(High-pressure piping in
head included)
a For testing of return rate from injector, see Testing and adjusting,
“Testing leakage from pressure limiter and return rate from injec-
tor”.
Return rate from
injector
Cranking
(When starting is not
available)
Max. 90 cc/min.
At low idle
(When starting is
available)
Max. 180 cc/min.
5 Defective supply pump
a For testing of return rate from supply pump, see Testing and
adjusting, Testing leakage-from pressure limiter and return rate
from injector.
Return rate from sup-
ply pump
Cranking
(When starting is not
available)
Max. 140 cc/min.
At low idle
(When starting is
available)
Max. 1,000 cc/min.