2000 MITSUBISHI MONTERO Service Repair Manual

E
XH AUST GAS REC IR CULA TIO N (E G R) SYSTE M
G EN ER AL IN FO RM ATIO N
T he exh austg as re cir c u la tio n (E G R)syste m lo w ers
t h e nit r o gen oxid e (N O x) em is sio n le ve l. W hen th e
a ir /fu el m ix tu re co m bustio n te m pera tu re is hig h,
a la rg e quantit y of nit r o gen oxid es (N O x) is
g enera te d in th e co m bustio n ch am ber. There fo re ,
t h is syste m re cir c u la te s part of em is sio n gas fr o m t
h e exh aust port of th e cylin der head to th e
c o m bustio n ch am ber th ro ugh th e in ta ke manif o ld
t o decre ase th e air /fu el mix tu re co m bustio n
t e m pera tu re , re su lt in g in re ductio n of NO x.
T he EG R flo w ra te is co ntr o lle d by th e EG R va lv e
s o as not to decre ase th e driv e abilit y .
O PER ATIO N
T he EG R va lv e is bein g clo se d and does not
r e cir c u la te exh austg ase s undero ne ofth e fo llo w in g
c o ndit io ns. O th erw is e , th e EG R va lv e is opened
a nd re cir c u la te exh aust gase s. D
T
he engin e co ola nt te m pera tu re is lo w .
D T
he engin e is at id le .
D T
he th ro ttle va lv e is wid ely opened.
S YSTE M DIA G RAM

B
atte ry
MB991658
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E
G R VA LV E
R EM OVA L AND IN STA LLA TIO N 3
4
5
6 1
8 ±
2 N×
m 2
2 ±
4 N×
m 5
9 ±
10 N×
m
R em oval ste p s
1 . W ate r hose co nnectio n
2 . E G R va lv e co nnecto r
3 . E G R pip e 4
. E G R pip e gaske t
5 . E G R va lv e
" AA
6. E G R va lv e gaske t
I N STA LLA TIO N SER VIC E PO IN T
" AA
EG R VA LV E GASK ET IN STA LLA TIO N
I n sta ll th e gaske t so th at it s pro je ctio n fa ce s to w ard s th e
d ir e ctio n sh ow n.

C
ANIS TE R
R EM OVA L AND IN STA LLA TIO N

C
ATA LY TIC CO NVER TE R
G EN ER AL IN FO RM ATIO N
T he th re e-w ay ca ta ly tic co nve rte r, to geth er wit h
t h e clo se d lo op air -fu el ra tio co ntr o l base d on th e
o xyg en se nso r sig nal, oxid iz e s ca rb on monoxid es
( C O )and hyd ro ca rb ons (H C)and re duce s nit r o gen
o xid es (N O x). W
hen th e mix tu re is co ntr o lle d at sto ic h io m etr ic
a ir -fu el ra tio , th e th re e-w ay ca ta ly tic co nve rte r
p ro vid es th e hig hest purif ic a tio n again st th e th re e
c o nstit u ents , nam ely , CO ,HC and NO x.
R EM OVA L AND IN STA LLA TIO N 4
9 ±
10 N×
m
R em oval ste p s
1 . C ata ly tic co nve rte r
2 . S eal rin g
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N
am e S
pecif ic a tio n E
xh aust em is sio n
c o ntr o l syste m E
xh aust g as re cir c u la tio n syste m
D EG R va lv e
D EG R so le noid va lv e No.1
D EG R so le noid va lv e No.2 E
le ctr o nic a lly -c o ntr o lle d EG R syste m
S in gle ty p e
D uty cycle so le noid va lv e
O N-O FF so le noid va lv e S
ta ndard va lu e E
G R so le noid va lv e Nos. 1 and 2re sis ta nce (a t 20_C ) W L
eve r posit io n se nso r outp utvo lt a ge V I
d le posit io n 0
.8 -1.0 F
ully open 3
.7 -4.9 E
ngin e sp eed se nso r re sis ta nce kW E
ngin e co ola ntte m pera tu re se nso r re sis ta nce A
t0_C 7
.7 -9.5 (
B uilt - in engin e co ola nt te m pera tu re gauge
u nit ) kW 2
.9 -3.6 A
t40_C 1
.3 -1.7 A
t80_C 0
.2 6 -0.3 5 S
pecif ie d se ala nt R
em ark E
ngin e co ola ntte m pera tu re gauge unit
t h re aded portio n 3
M Nut Lockin g Part N o. 4171 or equiv a le nt D
ry in g se ala nt N
um ber N
am e U
se M
D998464 T
e st harn ess
( 4 P, sq uare ) I
n sp ectio n of le ve r posit io n se nso r

E
G R so le n oid valv e No.2
1
7-4 6 E
XH AUST GAS REC IR CULA TIO N (E G R) SYSTE M
G EN ER AL IN FO RM ATIO N
T he ele ctr o nic a lly -c o ntr o lle d EG R syste m co nsis ts
o f an EG R va lv e , a va cu um pum p, E G R so le noid
v a lv e s Nos.1 and 2, glo w &EG R co ntr o l unit and
v a rio us se nso rs .
T he EG R va lv e is co ntr o lle d by th e negativ e
p re ssu re in sid e th e va lv e , whic h is co ntr o lle d by
E G R so le noid va lv e s Nos.1 and 2. T
he EG R so le noid va lv e s Nos.1 and 2are optim ally
c o ntr o lle d by th e glo w &EG R co ntr o l unit in
r e sp onse to th e engin e opera tio n co ndit io ns,b ase d
o n data re ce iv e d fr o m each se nso r.
I n th is way, th e EG R is co ntr o lle d to re duce NO x
e m is sio ns while main ta in in g good engin e
p erfo rm ance .
S YSTE M DIA G RAM V
acu um pum p
E G R va lv e O
FF O
N O
rif ic e
E G R so le noid va lv e No.2
( O N -O FF co ntr o l)
EG R so le noid
v a lv e No.1
( d uty co ntr o l)
E ngin e co ola nt
t e m pera tu re sw it c h G
lo w &EG R
c o ntr o lu nit
R ota tio n se nso r
L eve r posit io n se nso r
E ngin e co ola nt
t e m pera tu re se nso r
O
FF O
N
C O M PO NEN T LO CATIO N
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