Failure Code [Ca559] Common Rail Pressure Low Error 1 - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)

Failure code [CA559] Common Rail Pressure Low Error 1

Action level Failure code
L01 CA559
Detail of
Supply pump pressure is very low (level 1).
failure
Action of
Limits the common rail pressure.
controller
Problem on
Engine output lowers.
machine
Common rail pressure sensed by common rail pressure sensor can be checked with
Related
monitoring function. (Code: 36400 (MPa))
information
Method of reproducing failure code: Start engine.
No. Cause
Defective relevant
1
system
Improper fuel
2
Clogging of fuel filter
3
Defective low-pressure
4
circuit devices
Defective electrical
5
system of supply pump
SCV
Defective common rail
6
pressure sensor
Defective pressure
7
limiter
Defective injector
8
Defective supply pump If no failure is found by checks on causes 1 to 8, supply pump may be
9
* Although upper limit is 20 cc/min, note that standard value is 0 cc/min (no leakage) in normal condition.
<How to use check sheet>
Perform above troubleshooting and fill in check results on attached "Check sheet for fuel pressure low error".
Note 1: Check low-pressure fuel circuit parts for following items.
1. Remaining quantity of fuel
2. Clogging of fuel tank breather
3. Looking and wear of fuel feed pump and clogging of filter
4. Leakage from or clogging of low-pressure fuel piping
40-192
Common Rail Pressure Low Error 1
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
If another failure code is displayed, perform troubleshooting for it first.
Improper fuel may be used, so check fuel.
a If fuel filter is clogged, replace it.
a For details of troubleshooting, see Note 1.
a For check of fuel pressure in low-pressure circuit, see Testing and
adjusting, "Testing fuel pressure".
Fuel pressure in low-pressure circuit
(with engine running at high idle or
under load equivalent to rated load)
Electrical problem with supply pump SCV is estimated, so perform
troubleshooting for following codes: CA271 and CA272.
Common rail pressure sensor may be defective. Check wiring harness for
damage.
a For check of leakage from pressure limiter, see Testing and adjusting,
"Testing fuel return rate and leakage".
Leakage from pressure limiter
(Engine operation equivalent to rated
operation (with load by torque
converter stall))
a For check of limit return rate (spill) from injector, see Testing and adjusting,
"Testing fuel return rate and leakage".
Speed at rated operation
(at stall)
1,600 rpm
1,700 rpm
1,800 rpm
1,900 rpm
2,000 rpm
defective.
(PC88MR-CA559-400-A-Z0-A)
-49 to 0 MPa
{-0.5 to 0 kg/cm 2 }
Max. 20 cc/min (*)
Injector
Limit return (spill) rate
190 cc/min
200 cc/min
210 cc/min
220 cc/min
230 cc/min
PC88MR-10