1996 ACURA RL KA9 Service Repair Manual

(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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Brake Peda l Positio n Switc h Signa l
This signal s th e PC M whe n th e brak e peda l i s depressed .
Are th e brak e light s o n withou t
depressin g th e brak e pedal ? Inspec
t th e brak e peda l positio n
switc h (se e sectio n 19) .
NO
Depres s th e brak e pedal .
D o th e brak e light s com e on ?
YES
Is th e fus e OK ?
Chec k fo r a n ope n i n th e wir e
(BKS W line) :
1 . Depres s th e brak e pedal .
2 . Measur e voltag e betwee n PC M
connecto r terminal s E 2 an d
A2 6 wit h th e brak e peda l de -
pressed . —
Repai r shor t i n th e wir e be -
twee n th e brak e peda l posi -
tio n switc h an d th e STO P
HOR N (2 0 A ) fuse .
— Replac e th e STO P HOR N (2 0 A )
fuse .
Is ther e batter y voltage ? Repai
r ope n in th e wir e betwee n
th e PC M (E2 ) an d th e brak e peda l
positio n switch .
Brak e peda l positio n switc h sig -
nal i s OK .
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Emission Contro l Syste m
Exhaus t Ga s Recirculatio n (EGR ) Syste m (cont'd )
The HD S o r th e sca n tool indicate s Diagnosti c Trouble Code (DTC ) P0404 : An insufficien t lift o f th e Exhaus t Gas
Recirculatio n (EGR ) valve .
Is DT C P040 4 indicated ?NO
YE S
Chec k fo r vacuu m to th e EG Rvalve :1. Disconnec t th e No . 1 1 hos e fro mthe EG R valve .2. Connec t vacuu m pump/gaug e
t o th e hose .
3. Star t th e engin e an d le t i t idle .
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
C251 , C25 4 (locate d a t righ t shoc k
tower) , C10 7 (EG R valve ) an d
PCM .
Is ther e an y vacuum ?NO
VACUU M PUMP/GAUGE , 0-3 0 in.H g
A973 X - 04 1 - XXXX X
YES
No. 1 1 VACUU M
HOS E
Chec k fo r a malfunctio n i n th e
EG R valv e vacuu m contro l
solenoid valve :1. Disconnec t th e contro l bo x 4 P
connector .
2 . Rechec k th e No . 1 1 hos e fo r
vacuum . (T
o pag e 11-86 )
(T o pag e 11-86 )
(cont'd )
11-85
— Th e MI L ha s bee n reporte d on .
— DT C P040 4 is stored .
Proble m verification :
1 . D o th e PC M Rese t Procedure .
2 . Connec t th e SC S servic e con -
nector .
3. Star t th e engine . Hol d th eengin e a t 3,00 0 rp m wit h n o
loa d (i n Par k o r neutral ) unti l
th e radiato r fa n come s on .
4 . Driv e th e vehicl e o n th e roa d fo r
abou t 1 0 minutes . Tr y t o kee pthe engin e spee d i n th e 1,70 0 -
2,50 0 rp m range .
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