Failure Code [Ca559] Rail Press. Low Error - Komatsu Galeo PC138US-8 Shop Manual

40 Troubleshooting

Failure code [CA559] Rail press. low error

User code Failure code
E15
Contents of
• Supply pump does not feed fuel (level 1).
trouble
Action of
• Limits common rail pressure.
controller
Problem that
appears on
• Output drops.
machine
• Common rail pressure can be checked with monitoring function.
Related
(Code: 36400 Common rail pressure)
information
• Method of reproducing failure code: Start engine.
1 Defective related system
2 Use of improper fuel
3 Clogging of fuel filter
Defective low-pressure cir-
4
cuit device
Defective electrical system of
5
supply pump IMV
Defective common rail pres-
6
sure 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-
pressure feed".
Note 1: Check the low-pressure circuit parts for the following items.
1) Fuel level
2) Clogging of fuel tank breather
3) Sticking and wear of feed pump and clogging of filter
4) Leakage through and clogging of low-pressure fuel piping
5) Clogging of fuel filter
PC138US, USLC-8
Trouble
CA559
Causes
Rail press. low error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If another failure code is indicated, carry out troubleshooting for it.
Check fuel used directly (for high viscosity).
a If a fuel filter is clogged, replace it.
a For contents of troubleshooting, see Note 1. For check of pres-
sure in fuel low-pressure circuit, see Testing and adjusting,
"Testing fuel pressure".
Pressure in fuel low-pressure cir-
cuit
(At high idle or rated load)
Supply pump IMV may have electric trouble. Carry out trouble-
shooting for following failure codes [CA271], [CA272].
Common rail pressure sensor may be defective. Check wiring har-
ness for damage.
a For testing of leakage from pressure limiter, see Testing and
adjusting, "Testing leakage from pressure limiter and return
rate from injector".
Leakage from pressure limiter
*: A limit value is the value mentioned above, but a standard
value in normalcy is "0 cc/min. (no leak)".
a For testing of return rate (spill) from injector, see Testing and
adjusting, "Testing leakage from pressure limiter and return
rate from injector".
Speed at rated operation
1,600 rpm
1,700 rpm
1,800 rpm
1,900 rpm
2,000 rpm
If causes 1 – 8 are not detected, supply pump may be defective.
SEN02464-01
-49 – 0 kPa
2
{-0.5 – 0 kg/cm }
Max. 20 cc/min (*)
Return (Spill) limit from injector
190 cc/min
200 cc/min
210 cc/min
220 cc/min
230 cc/min
1
17