1996 ACURA RL KA9 fuse box

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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(From pag e 11-158 )
Chec k fo r vacuu m at idle :
Remov e No . 8 vacuu m hos e fro m
th e IMR C diaphrag m 2 an d con -
nec t a vacuu m gaug e to th e hose .
I s ther e vacuum ?
NO
YE S
(To pag e 11-160 ) I
s ther e batter y voltage ?
YES
Repai r ope n i n wir e betwee n th e
6 P connecto r an d No . 2 0 EC U
(PCM ) (2 0 A ) fus e i n th e under -
das h fuse/rela y box .
PC M CONNECTO R A (26P )
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 n
PC M connecto r termina l A2 0
and bod y ground .
Wire sid e o ffemal eterminal s
Is ther e continuity ? Repai
r ope n i n wir e betwee n
PC M (A20 ) an d th e 6 P connector .
YES
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 symp -
to m goe s away , replac e th e origi -
nal PCM .
Check fo r vacuu m at IMR C vacu -
u m reservoir :
Disconnec t th e No . 4 hos e o n
IMR C solenoi d valv e 1 an d con -
nec t a vacuu m gaug e t o th e
hose .
VACUU M
PUMP /
GAUG EA973X - 04 1 -XXXX X
IMRCDIAPHRAG M 2
No . 8 VACUU MHOSE
Is ther e vacuum ?
YES
Repai r th e blockag e o r vacuu m
lea k betwee n th e IMR C vacuu m
resorvoi r an d th e intak e mani -
fold.
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 6 P connecto r
fro m th e IMRC/engin e moun t
contro l solenoi d valv e assy .
3 . Star t engin e an d allo w it t o
idle .4. Measur e voltag e betwee n 6 P
connecto r termina l No . 1 an d
No. 4 .
IAB/ENGIN E MOUN T CONTRO L SOLENOI D
VALV E ASSY . 6 P CONNECTO R (C108 )
Wir e sid e o f femal e terminal s
(T o pag e 11-160 )
NO
NO
N O
(Fro m pag e 11-158 )
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Intake Ai r Syste m
Intake Manifol d Runne r Contro l (IMRC ) Syste m (cont'd )
(From pag e 11-159 ) (Fro m pag e 11-159 )
I s ther e batter y voltage ?
YES
NO
Chec k fo r a n ope n in th e wir e (IG 1
line) :
Measur e voltag e betwee n 6 P con -
necto r termina l No . 1 an d bod y
ground .
Is ther e batter y voltage ? Replac
e th e IMR C solenoi d valv e
2.
IMRC/ENGIN E MOUN T CONTRO L SOLENOI DVALVE ASSY . 6 P CONNECTO R (C108 )
Wire sid e o f femal e
terminal s
Repai r ope n in wir e betwee n th e
6 P connecto r an d No . 2 0 EC U
(PCM ) (20A ) fus e i n th e under -
das h fuse/rela y box .
PC M CONNECTO R A (26P )
Wir e sid e o f femal e terminal s
NORepai r ope n i n wir e betwee n
PC M (A22 ) an d th e 6 P connector .
YESReplac e th e IMR C solenoi d valv e1.
(T o pag e 11-161 ) (T
o pag e 11-161 )
I
s ther e vacuum ?
I
s ther e vacuum ?
NO
YE S
Chec k th e IMR C Solenoi d Valv e1:Disconnec t th e 6 P connecto r fro m
th e IMRC/engin e moun t contro l
solenoi d valv e assembly .
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 symp -
to m goe s away , replac e th e origi -
nal PCM .
Is ther e continuity ?
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. Chec k fo r continuit y betwee n
PC M connecto r termina l A2 2
an d bod y ground .
YES
NO
YE SChec 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 .
NO
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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

(From pag e 11-170 )
PCM CONNECTO R D (22P )
Chec k fo r a shor t i n th e wir e
(EGR L line) :Chec k fo r continuit y betwee n
PC M connecto r termina l D1 7 an d
th e bod y ground .
I s ther e continuity ? Repai
r ope n in th e wir e betwee n
the EG R valv e an d th e PC M (D17) .
YES
Repai r shor t i n th e wir e betwee nthe EG R valv e an d PC M (D17) .
(From pag e 11-170 )
Chec k fo r a n ope n in th e wir e (IG 1
line) :1. Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e contro l bo x
connector .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e voltag e betwee n bod y
groun d an d th e contro l bo x
connecto r termina l No . 1 . Wir
e sid e o f femal e terminal s
CONTRO L BO X 4P CONNECTO R (C257 )
Wir e sid e o f femal e terminal s
I s ther e batter y voltage ?
YES
Chec k th e vacuu m routing :
1 . Reconnec t th e vacuu m pump /
gaug e to th e No . 1 1 hose .
2 . Star t th e engin e an d le t i t idle .
3 . A t th e contro l bo x side , con -
nec t th e batter y positiv e ter -
mina l t o th e EG R valv e vacu -
u m contro l solenoi d valv e
connecto r termina l No . 1 .
4 . Whil e watchin g th e vacuu m
gauge , connec t th e batter y neg -
ativ e termina l t o th e EG R valv e
vacuu m contro l solenoi d
valv e connecto r termina l No . 2 . Repai
r ope n in th e wir e betwee n
th e EG R valv e vacuu m contro l
solenoi d valv e an d No . 2 0 EC U
(PCM ) (2 0 A ) fus e i n th e under -
das h fuse/rela y box .
CONTROL BO X 4PCONNECTO R
Is ther e approx . 26. 7 kP a
(20 0 mmHg , 8. 0 in.Hg ) o f vacu -
um withi n 1 second ?
Termina l sid e
o f mal e terminal s
NO
YE SChec k th e vacuu m hoses :1. Tur n th e ignitio n switc h OFF .2. Inspec t th e No . 1 1 an d No . 3
hose s fo r leaks , restriction s o r
misrouting .
Are th e hose s OK ?
(T o pag e 11-172 ) Correc
t a s necessary .
YES
NO
N
O
Replac e th e EG R valv e vacuu m
contro l solenoi d valve .
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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

TUBEProCarManuals.com

Emission Contro l Syste m
Evaporativ e Emissio n (EVAP ) Control s (cont'd )
The sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0452 : A lo w voltag e proble m in th e Fue l Tan k Pressur e
(FTP) sensor .
The fue l tan k pressur e senso r convert s fue l tan k absolut e pressur e int o electrica l signal s an d input s th e PCM .
OUTPU TVOLTAG E(V)
Th e MI L ha s bee n reporte d on .
DT C P045 2 is stored .
Chec k th e vacuu m lines :
Chec k th e vacuu m line s o f th e FT P
senso r fo r misrouting , leakage ,
breakag e an d clogging .
Ar e th e vacuu m line s OK ?
YES
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2. Remov e th e fue l fil l cap .3. Tur n th e ignitio n switc h O N (II) .
4 . Monito r th e FT P sensor volt-
age wit h th e Hond a PG MTester , o r measur e voltag ebetwee n bod y groun d an d
PC M connecto r termina l D15 .
I s ther e approx . 2. 5 V ?
NO
Chec k fo r a n ope n in wir e (VCC 2line):1. Tur n th e ignitio n switc h OFF .
2 . Reinstal l th e fue l fil l cap .
3 . Disconnec t th e FT P senso r 3 P
connector .
4. Tur n th e ignitio n switc h O N (II) .5. Measur e voltag e betwee n th e
FT P senso r 3 P connecto r ter -
minal s No . 1 an d No . 2 .
I s ther e approx . 5 V ?
YE S
Repai r o r replac e vacuu m line sas necessary .
Intermittent 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 C41 7
(locate d nea r th e under-das h
fuse/rela y box) , C31 9 (C674) *
(fue l tan k pressur e sensor ) an d
PCM .
Repai r ope n in th e wir e betwee nthe fue l tan k pressur e senso r an d
th e PC M (D21) .
PRESSUR E
PCM CONNECTO R D (22P )
Wire sid e o f femal e terminal s
FUEL TAN KPRESSUR E SENSO R3P CONNECTO R (C31 9 (C674)» )
Wir e sid e o f femal e terminal s
* : '0 0 - 0 1 model s
(T o pag e 11-179 )
YES
NO
N O
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