Page 241 of 1771

Throttle Cable
Inspection/Adjustment
1. Start the engine. Hold the engine at 3,000 rpm with
no load (transmission in or position) until the
radiator fan comes on, then let it idle.
2. Check that the throttle cable operates smoothly with
no binding or sticking. Repair as necessary.
3. Check cable free play at the throttle linkage. Cable
deflection should be 10 - 12 mm (0.39 - 0.47 in.)
ADJUSTING NUT
CABLE
BRACKET
DEFLECTION
10-12
mm
(0.39
-
0.47 in.)
4. If deflection is not within specs, loosen the locknut,
turn the adjusting nut until the deflection is as spec-
ified, then retighten the locknut.
5. With the cable properly adjusted, check the throttle
valve to be sure it opens fully when you push the
accelerator pedal to the floor. Also check the throttle
valve to be sure it returns to the idle position whenev-
er you release the accelerator pedal.
Installation
1. Fully open the throttle valve, then install the throttle
cable in the throttle linkage and install the cable
housing in the cable bracket.
LOCKNUT
INNER CABLE
ADJUSTING
NUT
THROTTLE
LINKAGE
CABLE
BRACKET
2. Start the engine. Hold the engine at 3,000 rpm with
no load (transmission in or position) until the
radiator fan comes on, then let it idle.
3. Hold the cable sheath, removing all slack from the
cable.
4. Turn the adjusting nut until it is 3 mm (0.12 in.) away
from the cable bracket.
3 mm
(0.12 in.)
ADJUSTING
NUT
LOCKNUT
9.8 N-m
(1.0 kg-m,
7.2 Ibf-ft)
5.
CABLE
BRACKET
Tighten the locknut. The cable deflection should now
be 10 - 12 mm (0.39 - 0.47 in.). If not, see inspection/
adjustment.
LOCKNUTProCarManuals.com
Page 242 of 1771

Intake Ai r Syste m
Throttl e Bod y
Descriptio n
The throttl e bod y i s a single-barre l side-draf t type . Th e
lowe r portio n o f th e throttl e valv e i s heate d b y engin e
coolan t fro m th e cylinde r head . Th e idl e adjustin g screw ,
whic h increases/decrease s bypas s air , an d th e Evapora -
tiv e Emissio n (EVAP ) Contro l Caniste r por t ar e locate d o n
the to p o f th e throttl e body .
THROTTL EPOSITION(TP)SENSO R
IDLE ADJUSTIN GSCREW
THROTTL E
VALV E
THROTTLE
STOPSCRE W
(non-adjustable )
Inspection
CAUTION : D o no t adjus t th e throttl e sto p screw . I t i s
prese t a t th e factory .
1 . Disconnec t th e vacuu m hos e (t o th e EVA P contro l
canister ) fro m th e to p o f th e throttl e body ; connec t
a vacuu m gaug e t o th e throttl e body .
2 . Star t th e engine . Hol d th e engine at 3,00 0 rp m wit h
no loa d (transmissio n i n ! o r position ) unti l th e
radiato r fa n come s on , the n le t i t idle .
VACUU M PUMP/GAUG EA973X - 04 1 - XXXX X
3. Allo w th e engin e t o idle , an d chec k tha t th e gaug e
indicate s n o vacuum .
If ther e i s vacuum , chec k th e throttl e cabl e (se e
pag e 11-135 ).
4 . Chec k tha t vacuu m is indicate d o n th e gaug e whe n
the throttl e is opene d slightl y fro m idle .
If th e gaug e indicate s n o vacuum , chec k th e throt -
tl e bod y port . I f th e throttl e bod y por t i s clogged ,
clea n i t wit h carbureto r cleaner .
5 . Sto p th e engine , an d chec k tha t th e throttl e cabl e
operates smoothly without bindin g o r sticking .
I f ther e ar e an y abnormalitie s i n th e abov e steps ,
check for .
— Excessiv e wea r o r pla y i n th e throttl e valv e shaft .
— Stick y o r bindin g throttl e leve r a t ful l close posi-
tion.
— Clearanc e betwee n throttl e sto p scre w an d throt -
tl e leve r a t ful l clos e position .
There shoul d b eno clearance .THROTTLE LEVE R
THROTTL ELEVER
THROTTL E STO P SCRE W(Non-adjustable )
Replace th e throttl e bod y i f ther e is excessiv e pla y i n th e
throttl e valv e shaf t o r i f th e shaf t i s bindin g o r sticking .
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Page 243 of 1771
Disassembly
with TCS : Remov e th e TC S contro l valv e (se e sectio n 19 ).
CRUIS E CONTRO L CABL E
CAUTION :
Th e throttl e sto p scre w is non-adjustable .
Afte r reassembly , adjus t th e throttl e cabl e (se e pag e 11-135 ) an d th e cruis e contro l cabl e (se e sectio n 23 ).
T PSENSO R
O-RING
IDLE ADJUSTIN GSCREW THROTTL
E
CABLE
22 N- m(2.2 kgf-m ,
1 6 Ibf-ft ) GASKE
T
Replace .
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Page 244 of 1771
Intake Ai r Syste m
Intake Ai r Bypas s (IAB ) Contro l Syste m
Descriptio n
Satisfactor y powe r performanc e is achieve d b y closin g an d openin g th e intak e ai r bypas s (IAB ) contro l valves . Hig h torqu e
a t lo w rp m is achieve d whe n th e valve s ar e closed , wherea s hig h powe r a t hig h rp m is achieve d whe n th e valve s ar e
opened .
INTAKE AI R BYPAS S (IAB ) LO W
CONTRO L SOLENOI D VALV E OF F
ENGIN E SPEE D IS ABOV E 3,35 0 rp m INTAK
E AI R BYPAS S (IAB ) HIG H
CONTRO L SOLENOI D VALV E OF F
ENGIN E SPEE D IS ABOV E 3,95 0 rp m
IAB CONTROLLOW VALVE : CLOSEDIAB CONTROLHIG H VALVE : CLOSE D IA
B CONTRO L
HIG H VALV E
IA B CONTRO L
HIG H DIAPHRAG M VALV E
IABCONTRO LLOW VALVE IAB CONTR OLLO WDIAPHRAGM VALVE
IAB CONTROLLOW VALVE : OPENIABCONTROLHIG H VALVE : CLOSE D IA
B CONTRO L
LO W VALVE : OPE N
IA B CONTRO L
HIG H VALVE : OPE N
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Page 245 of 1771

Troubleshooting Flowchar t
Inspectio n o f IA B Contro l Sys -tem.
No. 2 VACUU MHOSE
Chec k fo r vacuu m at idle :1. Star t engin e an d allo w it t oidle .2. Remov e No . 2 vacuu m hos efrom th e IA B lo w contro l dia -phrag m valv e an d connec t vacu -
u m gaug e to th e hose .
VACUU M PUMP /GAUG EA973X - 04 1 -XXXX X
Is ther e vacuum ?
Check fo r vacuu m at IA B vacuu m
tank :
Disconnec t th e No . 4 vacuu m
hos e o n IA B lo w contro l solenoi d
valv e an d connec t a vacuu m
gaug e t o th e hose .
IAB LO WCONTRO LDIAPHRAG MVALVE
Is ther e vacuum ? Repai
r th e blockag e o r vacuu m
lea k betwee n th e IA B vacuu m
tan k an d th e intak e manifold .
Chec k fo r a n ope n i n th e wir e
(IABCS 1 line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e 4 P connecto r
fro m th e IA B contro l solenoi d
valve assy .3. Star t engin e an d allo w i t t oidle .4. Measur e voltag e betwee n 4 P
connecto r termina l No . 2 an d
No. 4 .
IA B CONTRO L SOLENOI D VALV E
ASSY . 4 P CONNECTO R (C203 )
Wir e sid e o f femal e terminal s
I s ther e batter y voltage ? Replac
e th e IA B lo w contro l sole -
noi d valve .
Chec k fo r a n ope n in th e wir e (IG 1
line) :
Measur e voltag e betwee n 4 P con -
necto r termina l No . 2 an d bod yground .
(To pag e 11-140 ) (To pag e 11-140 )
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Page 246 of 1771

Intake Ai r Syste m
Intake Ai r Bypas s (IAB ) Contro l Syste m (cont'd )
(From pag e 11-139 )
Chec k fo r vacuu m at idle :
Remov e No . 8 vacuu m hos e fro m
th e IA B hig h contro l diaphrag m
valv e an d connec t a vacuu m gaug e
t o th e hose .
I s ther e vacuum ?
(T o pag e 11-141 ) (Fro
m pag e 11-139 )
I s ther e batter y voltage ?
Chec k fo r a n ope n i n th e wir e
(IABCS 1 line) :
1. Tur n th e ignitio n switc h OFF .2. Chec k fo r continuit y betwee nPCM connecto r termina l A2 0and 4 P connecto r termina lNo. 4 .
Is ther e continuity ?
Substitut e a known-goo d PC M
an d recheck . I f sympto m goe s
away , replac e th e origina l PCM .
Chec k fo r vacuu m at IA B vacuu m
tank :
Disconnec t th e No . 4 vacuu m
hos e o n IA B lo w contro l solenoi d
valv e an d connec t a vacuu m
gaug e t o th e hose .
I s ther e vacuum ?
Chec k fo r a n ope n i n th e wir e
(IABCS 2 line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e 4 P connecto r
fro m th e IA B contro l solenoi d
valv e assy .
3 . Star t engin e an d allo w i t t o
idle .4. Measur e voltag e betwee n 4 P
connecto r termina l No . 1 an d
No. 3 .
(T o pag e 11-141 ) Repai
r ope n in wir e betwee n th e
4 P connecto r an d No . 4 EC U
(PCM ) (1 5 A ) fus e i n th e under -
das h fuse/rela y box .
PC M CONNECTO R A (26P )
IAB CONTRO LSOLENOID VALV EASSY. 4 PCONNECTO R (C203 )
Wire sid e o f
femal e
terminal s
Repai r ope n i n wir e betwee n
PC M (A20 ) an d th e 4 P connector .
No . 8 VACUU M HOS E
IAB HIG H
CONTRO LDIAPHRAG MVALVE
VACUU M
PUMP/GAUG E
A973 X - 04 1 -
XXXX X
Repair th e blockag e o r vacuu m
lea k betwee n th e IA B vacuu m
tan k an d th e intak e manifold .
Wir e sid e o f femal e terminal s
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Page 247 of 1771

(From pag e 11-140 ) (From pag e 11-140 )
I s ther e batter y voltage ?
Chec k fo r a n ope n in th e wir e (IG 1
line) :Measur e voltag e betwee n 4 P con -
necto r termina l No . 1 an d bod y
ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n i n th e wire
(IABCS 2 line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Chec k fo r continuit y betwee n
PC M connecto r termina l A2 2
an d 4 P connecto r termina l
No. 3 .
Is ther e continuity ?
Chec k th e IA B Lo w Contro l Sole -
noi d Valve :
Disconnec t th e 4 P connecto r fro m
th e IA B contro l solenoi d valv e
assembly . Replac
e th e IA B hig h contro l
solenoi d valve .
IAB CONTRO L SOLENOI D VALV EASSY. 4 P CONNECTO R (C203 )
Wire sid e o f femal e
terminal s
Repai r ope n in wir e betwee n th e
4 P connecto r an d No . 4 EC U
(PCM ) (1 5 A ) o r (20A ) fus e in th e
under-das h fuse/rela y box .
PC M CONNECTO R A (26P )
Repai r ope n i n wir e betwee n
PC M (A22 ) an d th e 4 P connector .
I s ther e vacuum ? Replac
e th e IA B lo w contro l sole -
noi d valve .
(T o pag e 11-142 ) (To pag e 11-142 )
Substitut e a known-goo d PC Mand recheck . I f sympto m goe s
away , replac e th e origina l PCM .
I s ther e vacuum ?
Chec
k fo r vacuu m at 3,40 0 rpm :
1 . Rais e engin e spee d t o 3,40 0
rpm.2. Chec k fo r vacuu m a t No . 2
vacuu m hose .
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Page 248 of 1771

Intake Ai r Syste m
Intake Ai r Bypas s (IAB ) Contro l Syste m (cont'd )
(From pag e 11-141 )
(From pag e 11-141 )
PCM CONNECTO R A (26P )
Chec k fo r vacuu m at 4,00 0 rpm :
1 . Rais e engin e spee d t o 4,00 0
rpm.2. Chec k fo r vacuu m a t No . 8
vacuu m hose . Chec
k fo r a shor t i n th e wir e
(IABCS 1 line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e PC M connec -
to r A (26P ) fro m th e PCM .
3 . Chec k fo r continuit y betwee n
PC M connecto r termina l A2 0
an d bod y ground .
Is ther e continuity ?
Substitut e a known-goo d PC M
an d recheck . I f sympto m goe s
away , replac e th e origina l PCM .
I s ther e continuit y to ground ?
Substitut e a known-goo d PC M
an d recheck . I f sympto m goe s
away , replac e th e origina l PCM . Wir
e sid e o f femal e terminal s
Repai r shor t t o groun d a t wir e
betwee n PC M (A20 ) an d th e 4 Pconnector .
Replace th e IA B hig h contro l sole -noid valve .
Repai r shor t t o groun d a t wir e
betwee n PC M (A22 ) an d th e 4 P
connector .
Chec
k fo r a shor t i n th e wir e
(IABCS 2 line) :1. Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e PC M connec -
to r A (26P ) for m th e PCM .
3 . Chec k fo r continuit y betwee n
PCM connecto r termina l A2 2and bod y ground .
IA
B contro l syste m is OK . I
s ther e vacuum ?
I
s ther e vacuum ? Chec
k th e IA B hig h Contro l Sole -
noi d Valve :
Disconnec t th e 4 P connecto r fro m
th e IA B contro l solenoi d valv e
assembly .
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