Failure Code [Ca559] Rail Press Low Error - Komatsu Galeo PC800-8 Shop Manual

SEN00791-02

Failure code [CA559] Rail Press Low Error

Action code Failure code
E15 CA559
Contents of
• There is rail press very low error (level 1).
trouble
Action of
• Limits common rail pressure.
controller
Problem that
appears on • Engine output lowers.
machine
Related
information
1 Defect in related system
2 Use of improper fuel
Defect in low pressure cir-
3
cuit parts
4 Clogged fuel filter, strainer aFor more information on troubleshooting, see Note 2.
Defective electrical system
5
of supply pump PCV
Defective common rail
6
pressure sensor
Possible causes
and standard
value in normal
state 7 Defective pressure limiter
8 Defective injector
9 Defective supply pump
<How to use check sheet>
Carry out the above troubleshooting and take a record of the contents of the attached "Check sheet for no-pres-
sure feed".
10
Rail Press Low Error
Trouble
(Engine controller system)
Cause
If another failure code is displayed, carry out troubleshooting for it.
Fuel used may be improper. Check it directly.
aFor more information on troubleshooting, see Note 1. For check of
pressure in fuel low pressure circuit, see Testing and adjusting,
Checking fuel pressure.
Pressure in fuel low-pressure
Electrical system of supply pump PCV may be defective. Carry out trou-
bleshooting for failure code [CA271], [CA272], [CA273], or [CA274].
Mechanical system of common rail pressure sensor may be defective.
Check whether wiring harness is damaged.
aFor check of leakage through pressure limiter, see Testing and adjust-
ing, Checking fuel return rate and leakage.
Leakage through pressure limiter
aFor check of limit return rate (spill) from injector, see Testing and
adjusting, Checking fuel return rate and leakage.
Speed in rated operation
If causes 1 – 8 are not detected, supply pump may be defective.
Standard value in normal state/Remarks on troubleshooting
circuit
1,600 rpm
1,700 rpm
1,800 rpm
1,900 rpm
2,000 rpm
40 Troubleshooting
Min. 0.15 MPa
{Min. 1.5 kg/cm 2 }
Max. 10 cc/min
During rated output (pump relief)
operation
Limited return (spill) rate from injec-
tor
960 cc/min
1,020 cc/min
1,080 cc/min
1,140 cc/min
1,200 cc/min
PC800, 850-8