1996 ACURA RL KA9 Service Repair Manual

(From pag e 11-168 )
I s ther e an y vacuum ?
NO
Chec k fo r a shor t i n th e wir e (E S
line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e PC M connec -
tor A (26P) .3. Chec k fo r continuit y betwee n
bod y groun d an d th e contro l
bo x 4 P connecto r termina l No . 2 .
Is ther e continuity ?
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 symp -
tom/indicatio n goe s away , re -
plac e th e origina l PCM .
(Fro m pag e 11-168 )
Chec k fo r a malfunctio n i n th e
EG R valve :1. Mov e th e vacuu m pump/gaug e
t o th e EG R valve .
2. Wit h th e engin e a t idle , appl y26.7 kP a (20 0 mmHg , 8. 0 in.Hg )
o f vacuu m to th e EG R valve .
Doe s th e engin e stal l o r ru n
roug h an d doe s th e EG R valv e
hol d vacuum ?
YES
Chec k fo r a n ope n i n th e wir e
(VCC 2 line) :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e EG R valv e
positio n senso r 3 P 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. 3 .
Is ther e approx . 5 V ?
NO
(T o pag e 11-170 ) Chec
k vacuu m hos e routin g o f
th e entir e EG R system . I f hos e
routin g i s OK , replac e th e EG R
valv e vacuu m contro l solenoi d
valve.
CONTRO L BO X 4P CONNECTO R (C257 )
Wir e sid e o f femal e terminal s
Repai r shor t i n th e wir e betwee n
PC M (A6 ) an d EG R valv e vacuu m
contro l solenoi d valve .
VACUU M
PUMP/GAUGE ,
0 - 3 0 in.H g
A973 X - 04 1 -
XXXX X
Replac e th e EG R valve .
EGRVALV E
No. 1 1VACUU M
HOS E
EG R VALV E POSITIO N SENSO R CONNECTO R (C107 )
Wir e sid e o f femal e terminal s
YES
(To pag e 11-170 )
NO
YE S
YE S
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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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