Komatsu PC200-8M0, Shop Manual, Page: 935 / 1254

SEN06140-00
PC200, 200LC, 220, 220LC-8M0 40-600
13
600 Troubleshooting of engine (S-mode)
S-6 Engine lacks power
S-6 Engine lacks power
*1: Failure codes [CA559] and [CA2249]
*2: Failure codes [CA122] and [CA123]
General causes why engine lacks power
q
Insufficient intake of air
q
Insufficient supply of fuel
q
Improper fuel injection
q
Improper selection of fuel
q
Engine overheating
o
See “S-14 Coolant temperature becomes too high (overheating)“.
q
Controller is controlling in derate mode.
(limiting injection rate (power) because of an error in electrical system)
Causes
Clog
ged air
clea
ner ele
m
e
n
t
Ai
r
leakage
f
rom air int
ake piping
a
nd af
tercool
er
Se
izure or int
erf
er
ence at t
urbo
c
h
arge
r
Def
e
ct
ive
con
tact
of
val
v
e
wit
h
valve
se
at
Improp
er valve cle
a
ran
c
e
W
o
rn pisto
n
ri
ng or cyl
inder
Clog
ged air
br
eat
her ho
le in fue
l
tank
cap
Clog
ged or lea
k
ing fu
el pipin
g
Clog
g
ing
of
fue
l filter
S
tuck
or
seized
supp
ly
pn
mp p
luge
r
Clog
ged
inj
e
ctor
no
zzle
,
or
def
ect
ive spr
a
y (d
irt
in
in
jecto
r)
Defectiv
e
in
jecto
r
drive
(signa
l o
r sole
noid
)
Def
e
ct
ive
in
st
allat
ion
o
f boost
p
ressure sensor (ai
r
leak)
Def
e
ct
ive
b
oost pre
s
sur
e
se
nsor or wiring
ha
rness
Clogged fuel spill piping
Quest
ions
Check recent repair history.
Machine operation
hours
Operated for long period
E E E E
Power was lost
suddenly
Q w Q Q Q Q
gradually
Q Q Q Q Q Q
Fuel other than specified one is used
Q Q Q
Filters are not replaced as indicated in the Operation and Maintenance Manual.
w w
Oil must be added more frequently.
Q Q
Dust indicator indicates a red zone
w w
Air breather hole in fuel tank cap is clogged.
w
Fuel is leaking from fuel piping.
w
Power becomes insufficient after short stop of operation.
w
Check it
ems
Color of exhaust
smoke
black
w w
blue under light load
w
When exhaust manifold is touched immediately after starting engine, temperature of
some cylinders is low.
w w
While engine is running, interference sound is heard around turbocharger.
w
While engine is running, unusual noise is heard around cylinder head.
w
High idle speed is too high.
Q
High idle speed is normal, but speed suddenly drops when load is applied.
Q w Q Q
Engine does not pick up smoothly and combustion is irregular.
w w Q Q w
Engine hunts.
Q Q Q Q Q
Blowby gas is excessive
w w
T
ro
ublesho
oti
ng
Check air cleaner.
q
Check air intake piping.
q
When boost pressure is measured, it is found to be low.
q q q
When compression pressure is measured, it is found to be low.
q q
Check valve clearance.
q
Check fuel piping.
q
Check fuel filter.
q
Check spill port check valve.
q
Perform troubleshooting for "Supply pump pressure low error” according to failure
code (*1). q
When a certain cylinder is cut out, engine speed does not change.
q q
Check boost air pressure sensor mount.
q
Perform troubleshooting for "Charge pressure sensor error" according to failure code
(*2).
q
Remedy
Clea
n
Re
p
a
ir
R
e
place
Re
p
a
ir
Adju
st
R
e
place
Clea
n
Re
p
a
ir
R
e
place
R
e
place
R
e
place
R
e
place
Re
p
a
ir
R
e
place
R
epla
c
e