Komatsu BR380JG-1E0, Shop Manual, Page: 772 / 841

40 Troubleshooting SEN02307-00
BR380JG-1E0
9
*1: Displayed failure codes [CA559] and [CA2249]
c) Exhaust smoke comes but engine does not start (fuel is
being injected)
General causes why exhaust smoke comes out but engine does
not start
q
Lack of rotating force due to defective electrical system
q
Insufficient supply of fuel
q
Insufficient intake of air
q
Improper selection of fuel
Causes
Clogged a
ir cleaner
eleme
nt
W
orn dynamic valve syste
m (V
alve, r
ocker
lever
, etc.)
W
orn piston ring, cylin
der line
r
Use of impro
per fuel
Clogged a
ir breathe
r hole of fuel t
ank cap
Leaking or clogged fuel system, entr
y o
f air
Clogged f
uel filter
S
tuck, seized supply
pump plunger
Clogged inject
or
, defective spray
Def
ective, deteriora
ted batter
y
Def
ective coolant te
mperatur
e se
nsor
,
wir
ing
harness
Def
ective int
ake air
heater system
Questio
ns
Confirm recent repair history
Degree of use of machine
Operated for long period
E E E
Suddenly failed to start
w w Q
Non-specified fuel is being used
Q Q
Replacement of filters has not been carried out according to Operation and Mainte-
nance Manual
w w
Engine oil must be added more frequently
w
When engine is preheated or when temperature is low, preheating monitor does not
indicate normally
w
Dust indicator is red
w
Air breather hole of fuel tank cap is clogged
Q
Rust and water are found when fuel tank is drained
w
Fuel is leaking from fuel piping
w
When priming pump is operated, it makes no reaction or it is heavy
w Q
Starting motor cranks engine slowly
w
Che
ck it
ems
When engine is cranked, abnormal sound is generated around cylinder head
w
While engine is cranked
with starting motor,
If air bleeding plug of fuel filter is removed, fuel does not
flow out
Q w
If spill hose from injector is disconnected, little fuel spills
w
T
roublesho
oting
Inspect air cleaner directly
q
Inspect dynamic valve system directly
q
When compression pressure is measured, it is found to be low
q
When air is bled from fuel system, air comes out
q
Inspect fuel filter directly
q
Carry out troubleshooting according to “Rail Press (Very) Low Error (*1)” indicated by
code
q
When specific gravity of electrolyte and voltage of battery are measured, they are low
q
Coolant temperature gauge does not indicate normally
q
When starting switch is turned to HEAT, intake air heater mount does not become warm
q
Remedy
Clea
n
Replace Replace Replace Clea
n
Corr
ect
Clea
n
Replace Replace Replace Replace Replace