Page 634 of 1954
Fuel Supply System
Injectors (cont'd)
13. Slide new cushion rings onto the injectors.
14. Coat new O-rings with clean engine oil, and put them on the injectors.
15. Insert the injectors into the fuel rail first.
16. Coat new seal rings with clean engine oil and press them into the intake manifold.
17. To prevent damage to the O-ring, install the injectors in the fuel rail first, then install them in the intake manifold.
FUEL
RAILS
18. Install and tighten the retainer nuts.
19. Connect the 3P connector to the MAP sensor.
20. Connect the fuel hose to the fuel rail.
21. Connect the vacuum pipe.
22. Connect the vacuum hose and fuel return hose to the fuel pressure regulator.
23. Install the connectors on the injectors.
24. Connect the PCV valve.
25. Turn the ignition switch ON (II), but do not operate the starter. After the fuel pump runs for approximately 2 seconds,
the fuel pressure in the fuel line rises. Repeat this two or three times, then check whether there is any fuel leakage.
26. Install the engine cover.
27. Install the strut bar.ProCarManuals.com
Page 656 of 1954
Intake Air System
System Description
The system supplies air for all engine needs. It consists of the intake air pipe. Air Cleaner, intake air duct. Throttle Body,
Idle Air Control (IAC) Valve, idle air control thermal valve, and intake manifold.
A resonator in the intake air pipe provides additional silencing as air is drawn into the system.
IMRC SOLENOID VALVE 2
IMRC
SOLENOID
VALVE 1
IMRC
VACUUM
TANK
From No. 20 ECU
(PCM)
(20 A)
FUSE
(in the under-dash
fuse/relay box)
IMRC
DIAPHRAGM
VALVE 1
VARIOUS
SENSORS
THROTTLE BODY
INTAKE
AIR
DUCT
INTAKE
MANIFOLD
IDLE
ADJUSTING
SCREW
With
TCS
IDLE AIR
CONTROL
THERMAL
VALVE
IAC
VALVE
From PGM-FI
MAIN RELAY
IMRC
DIAPHRAGM
VALVE 2
IMRC
CHECK
VALVE
ENGINE
COOLANTProCarManuals.com
Page 661 of 1954
Intake Manifol d Runne r Contro l (IMRC ) Syste m
Descriptio n
Satisfactor y powe r performanc e i s achieve d b y closin g an d openin g th e intak e manifol d runne r contro l (IMRC ) 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 MANIFOL D RUNNE R CONTRO L
(IMRC ) SOLENOI D VALV E 1 OF F INTAK
E MANIFOL D RUNNE R CONTRO L
(IMRC ) SOLENOI D VALV E 2 OF F
ENGIN E SPEE D IS ABOV E 3,20 0 rp m
ENGINE SPEE D IS ABOV E 3,80 0 rp m
IMR C SOLENOI D VALV E 2
IMR C
SOLENOI D
VALVE !
IMR C
DIAPHRAG M 1
VARIOU SSENSOR S
IMRC
VALVE 1: CLOSED IMRC
VALVE 2: CLOSED
IMR C
VALV E 2
IMR C
DIAPHRAG M 2
IMR C
VALV E 1 IMR
C
DIAPHRAG M 1
IMR C
VALV E 1 : OPE N
IMR C
VALV E 2 : CLOSE D IMR
C
VALV E 1 : OPE N
IMR C
VALV E 2 : OPE N
From No . 2 0 EC U(PCM ) (20 A )FUS E
(i n th e under-das h
fuse/rela y box )
Fro
m PGM-F I
MAI N RELA Y
IACVALV E
ENGIN ECOOLAN T
VACUU
M
RESORVOI R
IMRC
DIAPHRAG M 2 VACUU
M
CHECKVALV E
INTAK E
MANIFOL DTHROTTL
E BOD Y
IDL
E AI R
CONTRO L
THERMA L
VALVEIDLEADJUSTIN GSCREWINTAK EAIRDUC T
ProCarManuals.com
Page 670 of 1954
Emission Control System
Exhaust Gas Recirculation (EGR) System
Description
The EGR system is designed to reduce oxides of nitrogen emissions (NOx) by recirculating exhaust gas through the EGR
valve and the intake manifold into the combustion chambers. It is composed of the EGR valve, EGR valve vacuum control
valve, EGR valve vacuum control solenoid valve, PCM and various sensors.
The PCM contains memories for ideal EGR valve lifts for varying operating conditions. The EGR valve position sensor
detects the amount of EGR valve lift and sends the information to the PCM. The PCM then compares it with the ideal EGR
valve lift which is determined by signals sent from the other sensors. If there is any difference between the two, the PCM
cuts current to the EGR valve vacuum control solenoid valve to reduce vacuum applied to the EGR valve.
EGR VALVE
POSITION SENSOR
INTAKE MANIFOLD
From No. 20 ECU (PCM)
(20 A) FUSE
(in the under-dash
fuse/relay box)
VARIOUS
SENSORS
EGR VALVE
EGR VALVE
VACUUM
CONTROL
SOLENOID
VALVE
EGR VALVE
VACUUM
CONTROL
VALVEProCarManuals.com
Page 674 of 1954
Emission Contro l Syste m
Exhaus t Ga s Recirculatio n (EGR ) Syste m (cont'd )
(From pag e 11-169 )
PCM CONNECTO R D (22P )
Chec k fo r a n ope n i n th e wir e
(VCC 2 line) :
Measur e voltag e betwee n th ePC M connecto r terminal s D2 1and D22 .
Is ther e approx . 5 V ?
NO
Substitut e a known-goo d PC M
an d rechec k (se e pag e 11-42 fo r
immobilize r information) . I f
symptom/indicatio n goe s away ,
replac e th e origina l PCM . Repai
r ope n in th e wir e betwee n
th e EG R valv e an d PC M (D21) .
(Fro m pag e 11-169 )
Chec k fo r a n ope n o r shor t i n th e
EG R valv e positio n sensor :
1 . Tur n th e ignitio n switc h OFF .
2 . A t th e senso r side , measur e
resistanc e betwee n th e EG R
valv e positio n senso r 3 P connec -
tor terminal s No . 1 an d No . 2 .
Is ther e continuit y o r resis -tance o f 10 0 k o r higher ?
NO
Chec k fo r a n ope n o r shor t i n th e
EG R valv e positio n sensor .
Measur e resistanc e betwee n th e
EG R valv e positio n senso r 3 P con -
necto r terminal s No . 2 an d No . 3 .
I s ther e 10 0 Kf i o r higher ?
YES
Chec k fo r a n ope n o r shor t i n th e
wir e (EGR L line) :
1 . Reconnec t th e EG R valv e
positio n senso r 3 P connector .
2. Tur n th e ignitio n switc h O N (II) .3. Measur e voltag e betwee n th ePC M connecto r terminal s D1 7and D22 .
Is ther e approx . 1. 2 V ?
(T o pag e 11-171 ) EG
R VALV E POSITIO N SENSO R CONNECTO R
Replac e th e EG R valve . Termina
l sid e o f mal e termina l
Replac e th e EG R valve .
PCM CONNECTO R D (22P )YES
Wir e sid e o f femal e terminal s
(T o pag e 11-171 )
NO
NO
YE S
YE SWir e sid e o f femal e terminal s
ProCarManuals.com
Page 677 of 1954
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P1498 : A hig h voltag e proble m in th e Exhaus t Ga s
Recirculatio n (EGR ) valv e positio n senso r circuit .
The MI L ha s bee n reporte d on .
DT C P149 8 is stored .
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2. Tur n th e ignitio n switc h O N (II) .
Is DT C P149 8 indicated ?
YES
Chec k fo r a n ope n i n th e EG R
valv e positio n senso r
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e EG R valv e
positio n senso r connector .
3. Tur n th e ignitio n switc h O N (II) .4. Measur e voltag e betwee n th e
EG R valv e positio n senso r 3 P
connecto r terminal s No . 1 an d
No. 2 .
Is ther e approx . 5 V ?
NO
Chec k fo r ope n i n th e wir e (SG 2
line) :
Measur e voltag e betwee n PC Mconnecto r terminal s D2 2 an d D21 .
I s ther e approx . 5 V ?
NO
Substitut e a known-goo d PC Mand rechec k (se e pag e 11-42 fo r
immobilize r information) . I f symp -
tom/indicatio n goe s away , replac e
the origina l PCM .
Intermitten t failure , syste m is O K
a t thi s time . Chec k fo r poo r con -
nection s o r loos e wire s a t C251 ,
C25 4 (locate d a t lef t shoc k tower) ,
C10 7 (EG R valve ) an d PCM .
EGR VALV E POSITIO N SENSO R CONNECTO R (C107 )
Replac e th e EG R valve . Wir
e sid e o f femal e terminal s
PC M CONNECTO R D (22P )
Repai r ope n i n th e wir e betwee n
PC M (D22 ) an d EG R valv e posi -
tio n sensor . Wir
e sid e o f femal e terminal s
YES
YE
S
NO
ProCarManuals.com
Page 679 of 1954
Evaporative Emissio n (EVAP ) Control s
Descriptio n
Th e evaporativ e emissio n control s ar e designe d t o minimiz e th e amoun t o f fue l vapo r escapin g t o th e atmosphere . Th e
syste m consist s o f th e followin g components :
A . Evaporativ e Emissio n (EVAP ) Caniste r
A n EVA P caniste r i s use d fo r th e temporar y storag e o f fue l vapo r unti l th e fue l vapo r can be purge d fro m th e EVA P
caniste r int o th e engin e an d burned .
B . Vapo r Purg e Contro l Syste m
EVA P caniste r purgin g is accomplishe d b y drawin g fres h ai r throug h th e EVA P caniste r an d int o a por t o n th e throttl e
body . Th e purgin g vacuu m is controlle d b y th e EVA P caniste r purg e valve .
EVA P CANISTE R PURG E VALV E DUT Y CONTROLLE D AFTE R START -
IN G ENGIN E
*: '9 6 - 9 9 model s*1: '0 0 - 0 1 model sC. Fue l Tan k Vapo r Contro l Syste m
Whe n fue l vapo r pressur e in th e fue l tan k is highe r tha n th e se t valu e o f th e EVA P tw o wa y valve , th e valv e open s an d
regulate s th e flo w o f fue l vapo r t o th e EVA P canister .
Durin g refueling , th e fue l tan k vapo r contro l valv e open s wit h th e pressur e in th e fue l tank , an d feed s th e fue l vapo r t o
th e EVA P canister .
'96 - 9 9 models :
FUELTANKPRESSURESENSOR
EVAPTWO WAYVALVE
FUEL TANKEVAP VALVE
FUEL TAN K
EVAP CANISTE RPURGE VALV E
EVAPBYPAS SSOLENOI DVALVE
EVAPCANISTE RVENT SHU T VALV EEVAP CONTRO LCANISTER
EVAPTHRE EWAYVALV E
FUEL FIL LCAP
Fro mNo. 2 0 EC U (PCM )(20 A ) FUS E(in th e under-das hfuse/relay box )
VARIOU SSENSOR S
ENGINE COOLAN T TEMPERATUR E ABOV E 99° F (37°C) * 140° F (60°C)*1
ProCarManuals.com
Page 680 of 1954
Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
'00 - 01 models:
From
No. 20 ECU
(PCM)
(20 A) FUSE
(in the under-dash
fuse/relay box)
FUEL TANK VAPOR
RECIRCULATION
TUBE
EVAP
BYPASS
SOLENOID
VALVE
EVAP
CANISTER
FILTER
EVAP
CANISTER
FUEL TANK VAROR
RECIRCULATION
VALVE
EVAP
TWO WAY
VALVE
FUEL TANK
EVAP
CANISTER
VENT SHUT VALVE
EVAP CANISTER
PURGE VALVE
VARIOUS
SENSORS
INTAKE
MANIFOLD
FUEL
TANK
PRESSURE
SENSOR
FUEL TANK
VAPOR CONTROL
VALVE
FUEL
FILL
CAP
FUEL TANK
VAPOR
SIGNAL
TUBEProCarManuals.com
