sensor ACURA RL KA9 1996 Service Manual PDF

Idle Contro l Syste m
System Descriptio n
The idl e spee d o f th e engin e is controlle d b y th e Idl e Ai r Contro l (IAC ) Valve .
Th e valv e change s th e amoun t o f ai r bypassin g int o th e intak e manifol d i n respons e t o electri c curren t controlle d b y th e
PCM . Whe n th e IA C Valv e is activated , th e valv e open s to maintai n th e prope r idl e speed .
VARIOU S
SENSOR S
INTAK E
MANIFOL D
IDLEADJUSTIN GSCREW
1. Afte r th e engin e starts , th e IA C valv e open s fo r a certai n time . Th e amoun t o f ai r i s increase d t o rais e th e idl e spee d
abou t 15 0 - 30 0 rpm .
2 . Whe n th e coolan t temperatur e i s low , th e IA C valv e i s opene d t o obtai n th e prope r fas t idl e speed . Th e amoun t o f
bypasse d ai r i s thu s controlle d in relatio n to th e engin e coolan t temperature .
3 . Whe n th e idl e spee d is ou t o f specificatio n an d th e sca n too l doe s no t indicat e Diagnosti c Troubl e Cod e (DTC ) P050 5 o r
P1508 , chec k th e followin g items :
• Adjus t th e idl e spee d (se e pag e 11-124 )
• Ai r conditionin g signa l (se e pag e 11-116 )
• AL T F R signa l (se e pag e 11-118 )
• Starte r switc h signa l (se e pag e 11-119 )
• Transmissio n rang e signa l (se e sectio n 14 )
• PS P switc h signa l (se e pag e 11-120 )
• Brak e peda l positio n switc h signa l (se e pag e 11-122 )
• Idl e ai r contro l therma l valv e (se e pag e 11-123 )
• Hose s an d connection s
• IA C valv e an d it s mountin g O-ring s
4 . I f th e abov e item s ar e normal , substitut e a known-goo d IA C valv e an d readjus t th e idl e spee d (se e pag e 11-124 ).
I f th e idl e spee d stil l canno t b e adjuste d t o specificatio n (an d th e sca n too l doe s no t indicat e DT C P050 5 o r P1508 ) afte r
IA C valv e replacement , 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
sympto m goe s away , replac e th e origina l PCM .
IDLEAIRCONTRO LTHERMA LVALVE
IAC VALV E
FromPGM-F IMAINRELA Y
ENGIN E COOLAN T
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Injectors
Replacemen t
9.8 N- m(1.0 kgf-m , 7. 2 Ibf-ft )
Do no t smok e whe n workin g o n th e fue l system . Kee p ope n flame s awa y fro m you r wor k area .
1 . Remov e th e stru t bar .
2 . Remov e th e engin e cover .
3 . Reliev e fue l pressur e (se e pag e 11-132 ).
4 . Disconnec t th e connector s fro m th e injectors .
5 . Disconnec t th e PC V valve .
6 . Disconnec t th e vacuu m hos e an d fue l retur n hos e fro m th e fue l pressur e regulator .
NOTE : Plac e a ra g o r sho p towe l ove r th e hose s befor e disconnectin g them .
7. Disconnec t th e fue l hos e fro m th e fue l rail .
8 . Remov e th e vacuu m pipe .
9 . Loose n th e retaine r nut s o n th e fue l rai l an d harnes s holder .
10 . Disconnec t th e 3 P connecto r fro m th e MA P sensor .
11 . Disconnec t th e fue l rail .
12 . Remov e th e injector s fro m th e intak e manifold .
HARNESSHOLDER
SEALRINGReplace .
FUELPRESSUR EREGULATO R
INJECTO R
INSULATO R
PCVVALV E
MAPSENSO R
O-RINGReplace .
CUSHIONRINGReplace .
INJECTO R
12 N- m(1.2 kgf-m ,
8. 7 Ibf-ft )
ENGIN ECOVER
9.8 N- m(1.0 kgf-m , 7. 2 Ibf-ft )
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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

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

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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
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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

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
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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
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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
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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

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