Failure Code [Ca559] Supply Pump Pressure Very Low Error - Komatsu WA250-6 Shop Manual

SEN03843-00

Failure code [CA559] Supply pump pressure very low error

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