ACURA RL KA9 1996 Service Repair Manual

(From pag e 11-70 )
I s th e fus e OK ?
NO
Is th e fus e OK ?
YES
Chec k fo r a n ope n i n th e wire s
(IG P lines) :
1 . Disconnec t th e fue l injecto r
an d IA C valv e connectors .
2. Tur n th e ignitio n switc h O N (II) .3. Measur e voltag e betwee n
bod y groun d an d th e PC M
connecto r terminal s A1 3 an d
B1 individually .
Is ther e batter y voltage ?
YES
Repai r shor t i n th e wir e
betwee n No . 6 EC U (PCM ) (2 0
A ) fus e an d PGM-F I mai n
relay.Repai r shor t i n th e wir e
betwee n PGM-F I mai n rela y
an d th e PCM , fue l injectors ,
o r IA C valve .
Repai r shor t i n th e wir ebetwee n fue l injector s an d
IA C valve .
Replac e No . 6 EC U (PCM ) (2 0
A)fuse .
Repair shor t i n th e wir e
betwee n No . 2 5 IG COI L (3 0 A )
fus e an d PGM-F I mai n relay .
Replac e No . 2 5 IG COI L (3 0 A )
fuse .
Repai r ope n i n th e wire(s )
betwee n th e PC M (A13 , B9 )
an d PGM-F I mai n relay .
Chec k fo r a poo r connectio n
o r loos e wire s a t th e PGM-F I
mai n relay .
Test th e PGM-F I mai n relay .Repai r shor t o r ope n i n th e
wir e betwee n th e immobilize r
uni t an d PCM .
(T o pag e 11-72 )
Inspec
t No . 2 5 IG COI L (3 0 A ) fus e
in th e under-das h fuse/rela y box .
Inspec t No . 6 EC U (PCM ) (2 0 A )
fus e i n th e under-das h fuse/rela y
box.
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PGM-FI Syste m
MIL Circui t Troubleshootin g (cont'd )
(From pag e 11-71 )
Chec k fo r a n ope n i n th e wire s
(PG , L G lines) :
1 . Reconnec t th e fue l injecto r
an d IA C valv e connectors .
2 . Measur e voltag e betwee n
body groun d an d th e PC Mconnecto r terminal s A12 , A25 ,A26, an d 6 9 individually .
Is ther e les s tha n 1. 0 V ?
YE S
Chec k fo r a shor t i n th e wire s
(VCC1 , VCC 2 lines) :
Measur e voltag e betwee n bod y
groun d an d th e PC M connecto r
terminals DI D an d 02 1 individu -ally.
Is ther e abou t 5 V ?NO
YE S
Substitut e a known-goo d PC M
an d recheck . I f symptom/indica -
tio n goe s away , replac e th e origi -
nal PCM .
PCM CONNECTO R A (26P )
LG1(BRN/BLK )
Repair ope n i n th e wire(s )
betwee n th e PC M an d G10 1 tha t
ha d mor e tha n 1. 0 V .
Chec k fo r a shor t i n a sensor :
Whil e measurin g voltag e betwee n
bod y groun d an d th e PC M con -
necto r terminal s D1 0 an d D2 1
individually , disconnec t th e 3 Pconnecto r o f eac h senso r on e a ta time .— MA P senso r
— T P senso r
— EG R valv e lif t senso r
— Fue l tan k pressur e senso r
— VS A contro l valv e angl e senso r
I s ther e abou t 5 V ?
NO
Chec k fo r a shor t i n th e wire s
(VCC1 , VCC 2 lines) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e EC M connec -tor D (22P) .3. Chec k fo r continuit y betwee nbody groun d an d EC M con -necto r terminal s D1 0 an d D2 1individually .
Is ther e continuity ?
NO
Substitut e a known-goo d PC M
an d recheck . I f symptom/indica -
tio n goe s away , replac e th e origi -
nal PCM .
Wire sid e o f femal e terminal s
Replac e th e senso r tha t ha d
abou t 5 V .
Repai r shor t i n th e wir e betwee n
th e MA P sensor , T P sensor , EG R
valv e positio n sensor , fue l tan k
pressur e senso r o r VS A contro l
valve angl e senso r an d PCM .
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Check th e Diagnosti c Troubl e
Cod e (DTC) :
1. Tur n th e ignitio n switc h OFF .2. Connec t th e sca n too l o r th eHDS .3. Tur n th e ignitio n switc h O N (II) .4. Rea d th e DT C wit h th e sca ntool o r th e HDS .
Are an y DTC(s ) indicated ? G
o t o th e DT C Troubleshootin g
Inde x (se e pag e 11-41) .
NO
Chec k fo r a shor t i n th e wir e
(SC S line) :
1 . Tur n th e ignitio n switc h OFF .
2. Tur n th e ignitio n switc h O N (II) .3. Measur e voltag e betwee n
PC M connecto r termina l C 5
and bod y ground .
PCM CONNECTO R C (12P )
SCS (RED )
Wire sid e o f femal e terminal s
I s ther e abou t 5 V (o r batter y
voltage) ?
Repair shor t i n th e wir e betwee n
th e servic e chec k connector , dat a
lin k connecto r an d PC M (C5) .
YES
DAT A LIN K CONNECTO R (DLC )
Termina l sid e o f femal e terminal s
I s ther e continuity ? Repair
short in the wire between
the DL C an d PC M (D4) .
NO
(T o pag e 11-74 )(cont'd )
(From pag e 11-70 )
Chec k fo r a shor t i n th e wir e
(K-line) :1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e PC M connecto rD (22P) .3. Chec k fo r continuit y betwee n
th e Dat a lin k connecto r (DLC )
16 P connecto r termina l No . 7
an d bod y ground .
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(From pag e 11-73 )
Chec k fo r a n ope n i n the wire
(K-line) :Check fo r continuit y betwee n th e
DL C 16 P connecto r termina l No. 7
and PC M connecto r termina l D4 .
Is ther e continuity ? Repai
r ope n in th e wir e betwee nthe DL C an d PC M (D4) .
YES
Chec k fo r a shor t i n th e wir e (MI Lline) :Turn th e ignitio n switc h O N (II) .
Doe s th e MI L com e on ?
NO
Repai r shor t i n th e wir e betwee n
the gaug e assembl y an d PC M
(A7) .
Substitut e a known-goo d PC M
an d recheck . I f symptom/indica -
tio n goe s away , replac e th e origi -
nal PCM .
MIL Circui t Troubleshootin g (cont'd )
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Check fo r a n ope n in th e wir e o r
bul b (MI L line) :
1. Tur n th e ignitio n switc h OFF .2. Connec t PC M connecto r ter -mina l A 7 an d bod y groun dwith a jumpe r wire .3. Tur n th e ignitio n switc h O N (II) .
Doe s th e MI L com e on ?
YES
Repai r ope n i n th e wire s
betwee n th e PC M (A7 ) an d
gaug e assembly .
Replac e th e MI L bulb .
Substitut e a known-goo d PC M
an d recheck . I f symptom/indica -
tion goe s away , replac e th e origi -nal PCM .
(From pag e 11-70 )
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Idle Contro l Syste m
Idle Contro l Syste m
The HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0506 : Idl e contro l syste m RP M lowe r tha n
expected .
NOTE : I f DT C P051 1 is store d a t th e sam e tim e a s DT C P0506 , troubleshoo t DT C P051 1 first , the n troubleshoo t DT C P0506 .
Possibl e Caus e
IAC valv e mechanica l malfunctio n
Idl e ai r contro l therma l valv e malfunction
Throttl e bod y clogge d port , imprope r adjustmen t
Intak e manifol d gaske t leakag e
Intak e ai r hos e loos e o r leakin g
Vacuu m hose s leakag e
EC T senso r incorrec t outpu t
Troubleshootin g Flowchar t
— Th e MI L ha s bee n reporte d on .— DT C P050 6 is stored .
Proble m verification :
1. Star t th e engine . Hol d th eengin e a t 3,00 0 rp m wit h n oloa d (i n Par k o r neutral ) unti lthe radiato r fa n come s on ,then le t i t idle .2. Chec k th e engin e spee d a tidle wit h no-loa d conditions :headlights, blowe r fan , rea rdefogger , radiato r fan , an d ai rconditione r ar e no t operating .
Is it 65 0 ± 50 rpm ?Intermitten t failure , syste m is O Kat thi s time .
NO
(T o pag e 11-77 )
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(From pag e 11-76 )
Chec k th e IA C valve :
Disconnec t th e 2 P connecto r fro m
th e IA C valve .
Doe s th e engin e spee d dro p
o r th e engin e stall ? Replac
e th e IA C valve .
YES
Adjus t th e (base ) idl e speed . I f
it' s impossible , clea n th e port s i n
th e throttl e body .
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Idle Contro l Syste m
Idle Contro l Syste m
The HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0507 : Idl e contro l syste m RP M highe r tha n
expected .
NOTE: I f DT C P051 1 i s store d a t th e sam e tim e a s DT C P0507 , troubleshoo t DT C P051 1 first , the n troubleshoo t DT C P0507 .
Possibl e Caus e
IA C valv e mechanica l malfunctio n
Idle ai r contro l therma l valv e malfunctio n
Throttle bod y clogge d port , imprope r adjustmen t
Intake manifol d gaske t leakag e
Intak e ai r hos e loos e o r leakin g
Vacuu m hose s leakag e
EC T senso r incorrec t outpu t
Troubleshootin g Flowchar t
— Th e MI L ha s bee n reporte d on .— DT C P050 7 is stored .
Problem verification :1. Star t th e engine . Hol d th eengin e a t 3,00 0 rp m wit h n oloa d (i n Par k o r neutral ) unti lthe radiato r fa n come s on ,then le t i t idle .2 Chec k th e engin e spee d a tidle wit h no-loa d conditions :headlights , blowe r fan , rea rdefogger , radiato r fan , an d ai rconditione r ar e no t operating .
Is it 65 0 ± 5 0 rpm ?Intermitten t failure , syste m is O Kat thi s time .
NO
(T o pag e 11-79 )
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(From pag e 11-78 )
Chec k th e idl e ai r contro l therma l
valve :
1. Tur n th e ignitio n switc h OFF .2. Remov e th e cove r fro m th e
idl e ai r contro l therma l valve .
3 . Star t th e engin e an d le t i t idle .
4 . Pu t you r finge r o n th e valv e
sea t are a an d chec k fo r ai r
flow .
Is ai r flo w fel t i n th e valv eseat area ?
NO
Chec k fo r vacuu m leaks , mak e
sur e th e throttl e valv e is com -
pletel y closed , an d repai r a s
necessary .Adjust th e idl e speed . I f it' s
impossible , replac e th e IA C
valve .
Check engin e coolan t leve l an d
fo r ai r i n th e coolin g system . I f
OK , replac e th e idl e ai r contro ltherma l valve .
NOTE : I f th e cove r o f th e idl e ai r
contro l therma l valv e wa s
removed , d o th e PC M rese t pro -
cedure .
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Idle Contro l Syste m
Idle Ai r Contro l (IAC ) Valv e
The HD S o r th e sca n too l indicate s Diagnosti c Troubl e Cod e (DTC ) P0511 : A proble m in th e Idl e Ai r Contro l (IAC )
valve circuit .
— Th e MI L ha s bee n reporte d on .
— DTCP051 1 i s stored .
Problem verification :1. D o th e PC M Rese t Procedure .
2 . Star t th e engine .
Is DTC P0511 indicated?
YES
Chec k fo r a n ope n i n the wir e
(IGP 1 line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e IA C valv e con -
nector .
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 IA C valv e con -
necto r termina l No . 2 .
I s ther e batter y voltage ?
I s ther e batter y voltage ?
YES
Chec k th e IA C valv e function :
Momentaril y connec t PC M con -
necto r terminal s A 5 an d A1 2 wit h
a jumpe r wir e severa l times .
Doe s th e IA C valv e click ?
YES
Substitut e a known-goo d PC M
an d recheck . I f symptom/indica -
tio n goe s away , replac e th e origi -
nal PCM .
NO
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 terminal s a t
C253 , (locate d a t righ t shoc k
tower) , C12 9 (IA C valve ) an d
PCM .
Repai r ope n in th e wir e betwee n
IA C valv e an d PGM-F I mai n relay . Wir
e sid e o f femal e terminal s
Repai r ope n o r shor t i n th e wir e
betwee n PC M (AS ) an d IA C valve .
Replac e th e IA C valve .
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