Mitsubishi 4DQ50 - Trouble Shooting Chart

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 .. ..
=
00 00
..
~~
.. 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-