2000 MITSUBISHI PAJERO PININ Workshop Manual

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T he G aso lin e D ir e ct In je ctio n S yste m c o nsis ts
o f s e nso rs w hic h d ete ct th e e ngin e c o ndit io ns,
t h e e ngin e-E C U w hic h c o ntr o ls th e s yste m
b ase d o n s ig nals fr o m th ese s e nso rs , a nd
a ctu ato rs w hic h o pera te u nder th e c o ntr o l o f
t h e e ngin e-E C U. T he e ngin e-E C U c a rrie s o ut a
ctiv it ie s s u ch a s fu el in je ctio n c o ntr o l, id le
s p eed c o ntr o l a nd ig nit io n tim in g c o ntr o l. In
a ddit io n, th e e ngin e-E C U is e quip ped w it h
s e ve ra l d ia gnosis m odes w hic h s im plif y
t r o uble sh ootin g w hen a p ro ble m d eve lo ps.
F U EL IN JE C TIO N C O NTR O L
T he in je cto r d riv e tim es a nd in je cto r tim in g a re
c o ntr o lle d s o th at th e o ptim um a ir /fu el m ix tu re
i s s u pplie d to th e e ngin e to c o rre sp ond to th e
c o ntin ually -c h angin g e ngin e o pera tio n c o ndi-
t io ns.
A s in gle in je cto r fo r e ach c ylin der is m ounte d
a t th e c ylin der h ead. T he fu el is s e nt u nder
p re ssu re fr o m th e fu el ta nk to th e fu el p re ssu re
r e gula to r ( lo w p re ssu re ) b y th e fu el p um p ( lo w
p re ssu re ). T he p re ssu re is r e gula te d b y th e fu el
p re ssu re r e gula to r ( lo w p re ssu re ) a nd th e fu el
r e gula te d is th en s e nt to th e fu el p um p ( h ig h
p re ssu re ). T he fu el u nder in cre ase d p re ssu re
g enera te d b y th e fu el p um p ( h ig h p re ssu re ) is
t h en r e gula te d b y th e fu el p re ssu re r e gula to r
( h ig h p re ssu re ) a nd is th en d is tr ib ute d to e ach
o f th e in je cto rs v ia th e d eliv e ry p ip es. F
uel in je ctio n is n orm ally c a rrie d o ut o nce fo r
e ach c ylin der fo r e ve ry tw o r o ta tio ns o f t h e
c ra nksh aft. T he fir in g o rd er is 1 -3 -4 -2 . T his is
c a lle d s e quentia l fu el in je ctio n.
W hen th e e ngin e is c o ld o r u nder a s e ve re lo ad,
t h e ª o pen-lo opº c o ntr o l k e eps th e a ir /fu el r a tio
a t a r ic h er th an u su al le ve l to m ain ta in
d riv e abilit y . W hen th e e ngin e is u nder lo w o r
m ediu m lo ads, th e a ir /fu el r a tio b eco m es le aner
t o r e duce fu el c o nsu m ptio n. W hen th e e ngin e
i s r u nnin g a t m ediu m o r h ig h lo ads a fte r h avin g
w arm ed u p, th e ª c lo se d-lo opº c o ntr o l u se s th e
s ig nal fr o m th e o xyg en s e nso r to k e ep th e
a ir /fu el r a tio a t th e o ptim um th eore tic a l le ve l.
T H RO TTLE V A LV E O PEN IN G A NG LE C O NTR O L
T his s yste m c o ntr o ls th ro ttle v a lv e o penin g
a ngle e le ctr o nic a lly . T he e ngin e-E C U d ete r-
m in es h ow d eeply th e a cce le ra to r p edal is
d epre sse d b y m eans o f th e a cce le ra to r p osit io n
s e nso r ( A PS). T hen th e e ngin e-E C U s e nds a t
a rg et v a lu e o f th e th ro ttle v a lv e o penin g a ngle
t o th e th ro ttle v a lv e c o ntr o lle r. T he th ro ttle v a lv e
c o ntr o l s e rv o o pera te s th e th ro ttle v a lv e s o th at
i t r e ach es th e ta rg et o penin g a ngle .
I D LE S PEED C O NTR O L
T his s yste m m ain ta in s e ngin e id le s p eed a t a
p re dete rm in ed c o ndit io n b y c o ntr o llin g th e a ir
f lo w th at p asse s th ro ugh th e th ro ttle v a lv e
a cco rd in g to e ngin e id lin g c o ndit io n a nd e ngin e
l o ads a t id lin g.
T he e ngin e-E C U o pera te s th e th ro ttle v a lv e
c o ntr o l s e rv o s o th at e ngin e s p eed is m ain ta in ed w
it h in a m ap v a lu e. T he m ap v a lu e is
p re dete rm in ed a cco rd in g to e ngin e c o ola nt
t e m pera tu re a nd a ir -c o ndit io nin g lo ad. I n
a ddit io n, if th e A /C s w it c h is tu rn ed o n o r o ff
d urin g e ngin e id lin g, th e e ngin e-E C U
c o m pensa te s th e e ngin e s p eed b y o pera tin g
t h e th ro ttle v a lv e c o ntr o l s e rv o a s n ece ssa ry .
I G NIT IO N T IM IN G C O NTR O L
T he p ow er tr a nsis to r lo ca te d in th e ig nit io n
p rim ary c ir c u it tu rn s O N a nd O FF to c o ntr o l
t h e p rim ary c u rre nt flo w to th e ig nit io n c o il. T his
c o ntr o ls th e ig nit io n tim in g in o rd er to p ro vid e
t h e o ptim um ig nit io n tim in g w it h r e sp ect to th e
e ngin e o pera tin g c o ndit io ns. T he ig nit io n tim in g i
s d ete rm in ed b y th e e ngin e-E C U fr o m th e
e ngin e s p eed, in ta ke a ir v o lu m e, e ngin e c o ola nt
t e m pera tu re , a tm osp heric p re ssu re a nd
i n je ctio n tim in g ( in ta ke s tr o ke o r c o m pre ssio n
s tr o ke ).

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4 Thro ttle v a lv e
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3 In ta ke a ir t e m pera tu re
s e nso r
* 2 Air flo w s e nso r
* 7 Baro m etr ic
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H ig h-p re ssu re fu el
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[ in te gra te d in fu el
p re ssu re r e gula to r
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F uel p um p
( h ig h p re ssu re ) I
n je cto r

1 In je cto r
d riv e r
* 8 Engin e c o ola nt
t e m pera tu re s e nso r
* 9 Deto natio n s e nso r
* 1 Oxyg en s e nso r
* 6 Cra nk a ngle s e nso r C
anis te r

3 Purg e c o ntr o l
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4 Thro ttle v a lv e c o n-
t r o l s e rv o
Engin e c o ntr o l r e la y
Fuel p um p r e la y
In je cto r d riv e r r e la y
Thro ttle v a lv e c o ntr o l
s e rv o r e la y
A/C r e la y
Ig nit io n c o il
Fan c o ntr o lle r
GDI E C O in dic a to r la m p
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Dia gnosis o utp ut
Alt e rn ato r G te rm in al
Thro ttle v a lv e c o ntr o lle r
A/T -E C U
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B991519 A
lt e rn ato r h arn ess
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easu re m ent o f v o lt a ge d urin g
t r o uble sh ootin g M
B991536 T
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h arn ess A
dju stm ent o f th ro ttle p osit io n s e nso r M
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