Trouble Shooting Chart - Mitsubishi 4DQ50 Service Manual

1.
TROUBLE SHOOTING CHART
EDgiDe
will not start
EDsiDe
lacks Abaormal
ex-
power
baust smolce
Engine
hunts
Complaint
EnJiDe turns
EDgiDedoes
.,;
i
When
1--,-
cmr but does
not
tum
::
. .
~
0
i
!
operatiDg
.i:
not
start.
~o Ofti'
0
g
~
,;..
Ow
. .
"'
...
..
-0
....
J: ~
:::
]
..
-
Ci
~
0
. .
. .
. .
-
. .
0'"
.i:
..
,;..
~
Ii
. .
~
"
"
' "
. .
-oJ!
. . . =
0
!!
..
OIl
~
i
..
~e
.
;;
~=
0
..
;
~
-=
,;.. ::
Probable cause
1
. .
"
-0
~ ! ! -a
.l:I
oil
...
' "
",,,,
a. a.
. .
OIl
"
OIl
~
~ J:e
lie
;e
~ ~
.c
J:
~
' "
-
1.5
0
' "
l!! e :!
ell"&b
. .
~
J:
li ;
;
..
".
"-0 "-0
. .
"
. .
..
.:I
~
,,~
.5~;
" "
. .
-=..=
J! .. ell
i-=
....
..
li
i
e.: el;!
!..=
~l;!
..
u
. .
0
'=1
"' ....
!! ' "
e
' " ' " ' "
;
" 0
oJ! ::c:c
"&be
. . ..
=
0 0 0 0
. .
~~
.. 0
·0iI Oil '00
. .
°e -e
~=
:!~:!
" , -
",,,
..
:!!
~Ii ~§
J:
~E
e e
' "
..c
.c
Zoo
<.
cn~"
1111:1
III
I!
:c
<
~
III. III III III
~ ~
tl;0~
•
fuel supply
CO
0 0
0
JA.l"CUOIl
pump
Greater wriance of injec -
tion quantity
0 0 0 0 0 0 0 0
Defective fuel injection
pump seals
lDsufficic:Dt injection
0
0
0
quantity
Excessive
iJljection
quantity
0
Improper fuel spray !rom 0
0 0
0 0 0 0 0
injection nozzles
e
Excessive fuel return from 0
0 0 0
!
injection nozzles
~
~ction timias
coo
0
0
0
0
;;
!OU1ced
"
' " "
Injection
timias
coo
retarded
0
0 0 0 0 0
Defective autOmatic timer
0 0 0 0 0
De£ec:tiw:
gowmot control
spring
l\IaIadjusted goWlrDOr
0 0
damper sprins
Engine speed coo low
0
Failure of engine
CO
Stop
properly
Poor grade of fuel oil
0
0 0 0 0 0 0
Fuel oil viscosity too
bigb 0 0
Poor grade o£ oil
Oil
'Viscoaity
too
high
0
e
Oil viscosity
COO
low
0
0
1i:
low oil pressure
'"
..
l' Excessive oil Jeak
j
Pumping up of oil
0
o.
0
"
Clogged oil fi1ter
...l
Defective oil bypass
alarm or lamp
Defective oil indicator
switch or lamp
- 60-