MITSUBISHI PAJERO PININ 2000 Workshop Manual

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V A CUUM H O SE C HEC K
1 . Usin g th e p ip in g d ia gra m a s a g uid e, c h eck to b e s u re
t h at th e v a cu um h ose s a re c o rre ctly c o nnecte d.
2 . Check th e c o nnectio n c o ndit io n o f th e v a cu um h ose s,
( re m ove d, lo ose , e tc .) a nd c h eck to b e s u re th at th ere
a re n o b ends o r d am age.
V A CUUM H O SE IN STA LLA TIO N
1 . When c o nnectin g th e v a cu um h ose s, th ey s h ould b e
s e cu re ly in se rte d o nto th e n ip ple s.
2 . Connect th e h ose s c o rre ctly , u sin g th e v a cu um h ose p ip in g
d ia gra m a s a g uid e.


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G EN ER AL IN FO RM ATIO N
T he c ra nkca se e m is sio n c o ntr o l s yste m p re ve nts
b lo w -b y g ase s fr o m e sca pin g in sid e th e c ra nkca se
i n to th e a tm osp here .
F re sh a ir is s e nt fr o m th e a ir c le aner in to th e
c ra nkca se th ro ugh th e b re ath er h ose . T he a ir
b eco m es m ix e d w it h th e b lo w -b y g ase s in sid e th e
c ra nkca se .
T he b lo w -b y g as in sid e th e c ra nkca se is d ra w n in to
t h e in ta ke m anif o ld th ro ugh th e p osit iv e c ra nkca se
v e ntila tio n ( P C V) v a lv e . T
he P C V v a lv e lif ts th e p lu nger a cco rd in g to th e
i n ta ke m anif o ld v a cu um s o a s to r e gula te th e flo w
o f b lo w -b y g as p ro perly . In o th er w ord s, th e b lo w -b y
g as flo w is r e gula te d d urin g lo w lo ad e ngin e
o pera tio n to m ain ta in e ngin e s ta bilit y , w hile th e flo w
i s in cre ase d d urin g h ig h lo ad o pera tio n to im pro ve
t h e v e ntila tio n p erfo rm ance .
S YSTE M D IA G RAM




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G EN ER AL IN FO RM ATIO N
T he e va pora tiv e e m is sio n c o ntr o l s yste m p re ve nts
f u el v a pours g enera te d in th e fu el ta nk fr o m e sca pin g
i n to th e a tm osp here .
F uel v a pours fr o m th e fu el ta nk flo w th ro ugh th e
f u el ta nk p re ssu re c o ntr o l v a lv e a nd v a pour
p ip e/h ose to b e s to re d te m pora rily in th e c a nis te r.
W hen d riv in g th e v e hic le , fu el v a pours s to re d in
t h e c a nis te r flo w th ro ugh th e p urg e s o le noid a nd
p urg e p ort a nd g o in to th e in ta ke m anif o ld to b e s
e nt to th e c o m bustio n c h am ber.
W hen th e e ngin e c o ola nt te m pera tu re is lo w o r w hen
t h e in ta ke a ir q uantit y is s m all ( w hen th e e ngin e
i s a t id le , fo r e xa m ple ), th e e ngin e c o ntr o l u nit tu rn s
t h e p urg e s o le noid o ff to s h ut o ff th e fu el v a pour
f lo w to th e in ta ke m anif o ld .
T his d oes n ot o nly in su re th e d riv e abilit y w hen th e
e ngin e is c o ld o r r u nnin g u nder lo w lo ad b ut a ls o
s ta biliz e th e e m is sio n le ve l.
S YSTE M D IA G RAM S
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C O M PO NEN T L O CATIO N

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XH AUST G AS R EC IR CULA TIO N ( E G R) S YSTE M
G EN ER AL IN FO RM ATIO N
T he e xh aust g as r e cir c u la tio n ( E G R) s yste m lo w ers
t h e n it r o gen o xid e ( N O x) e m is sio n le ve l. W hen t h e
a ir /fu el m ix tu re c o m bustio n te m pera tu re is h ig h, a
l a rg e q uantit y o f n it r o gen o xid es ( N O x) is g enera te d
i n th e c o m bustio n c h am ber. T here fo re , th is s yste m
r e cir c u la te s p art o f e m is sio n g as fr o m th e e xh aust p
ort o f th e c ylin der h ead to th e c o m bustio n c h am ber
t h ro ugh th e in ta ke m anif o ld to d ecre ase th e a ir /fu el
m ix tu re c o m bustio n te m pera tu re , r e su lt in g in
r e ductio n o f N O x.
T he E G R flo w r a te is c o ntr o lle d b y th e E G R v a lv e
s o a s n ot to d ecre ase th e d riv e abilit y .
O PER ATIO N
T he E G R v a lv e is b ein g c lo se d a nd d ose n ot
r e cir c u la te e xh aust g ase s u nder o ne o f th e fo llo w in g
c o ndit io ns. O th erw is e , th e E G R v a lv e is o pened
a nd r e cir c u la te e xh aust g ase s.
The e ngin e c o ola nt te m pera tu re is lo w .
The e ngin e is a t id le .
The th ro ttle v a lv e is w id ely o pened.
S YSTE M D IA G RAM