1996 ACURA RL KA9 Service Repair Manual

Idle Contro l Syste m
Alternato r (ALT ) F R Signa l
PCM CONNECTOR S
Is ther e abou t 5 V ?
YE S
Chec k th e operatio n o f th e ALT :
1 . Tur n th e ignitio n switc h OFF .
2 . Reconnec t th e AL T GR N 4 P
connecto r t o th e ALT .
3 . Star t th e engine . Hol d th e
engin 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 ,
then le t i t idle .4. Measur e voltag e betwee n PC M
connecto r terminal s D 5 an d A26 .
Doe s th e voltag e decreas e whe n
headlight s an d rea r defogge r ar e
turne d on ?
NO
Chec k fo r a n ope n in th e wir e (AL T
F line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e negativ e bat -
ter y cabl e fro m th e battery .
3 . Disconnec t th e PC M connec -
tor D (22P) .4. Disconnec t th e GR N 4 P con -
necto r fro m th e ALT .
5 . Connec t th e AL T 4 P connecto r
termina l No . 4 to bod y groun d
wit h a jumpe r wire .
6 . Chec k fo r continuit y betwee n
body groun d an d PC M con -necto r termina l D5 .
I s ther e continuity ?
YES
See th e AL T inspectio n
(see sectio n 4 ).
N O
Wir e sid e o f femal e terminal s
Chec k fo r a shor t i n th e wir e (AL T
F line) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e negativ e bat -
ter y cabl e fro m th e battery .
3 . Disconnec t th e PC M connecto r
D (22P) .4. Chec k fo r continuit y betwee n
bod y groun d an d PC M con -
necto r termina l D5 .
I s ther e continuity ? Repai
r shor t i n th e wir e betwee n
the PC M (D5 ) and th e ALT .
NO
Substitut e a known-goo d PC Mand rechec k (se e pag e 11-4 1 fo rimmobilize r information) . I f pre -
scribe d voltag e is no w available ,
replac e th e origina l PCM .
AL T F R signa l i s OK .
ALT GR N 4 P CONNECTO R (C131 )
Repair ope n wir e betwee n th ePCM (D5 ) and th e ALT .
PCM CONNECTO R D (22P )
Wir e sid e o f femal e terminal s
NO
Wir e sid e o f femal e terminal s
YES YE
S
This signal s th e PC M whe n th e Alternato r (ALT ) i s charging .
Inspection o f AL T F R Signal .
Chec k fo r a shor t i n th e wir e (AL T
F line) :
1 . Disconnec t th e GR N 4 P con -
necto r fro m th e ALT .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Measur e voltag e betwee n PC M
connecto r terminal s D 5 an d A26 .
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PCM CONNECTOR S
Wir e sid e o f femal e terminal s
I s ther e batter y voltage ?
Is th e fus e OK ?
NO
— Repai r shor t i n th e wir e be -twee n th e PC M (C6 ) an d th eNo . 1 4 STARTE R SIGNA L (7. 5
A ) fus e o r th e PGM-F I mai n
relay .— Replac e th e No . 1 4 STARTE RSIGNAL (7. 5 A ) fuse .
Repai r ope n i n th e wir e betwee n
the PC M (C6 ) and th e No . 1 4STARTE R SIGNA L (7. 5 A ) fuse .
YES
Inspec t th e No . 1 4 STARTE R SIG -
NA L (7. 5 A ) fus e in th e under-das h
fuse/rela y box .NO
YE S
Starte r switc h signa l i s OK .
Chec
k fo r a n ope n o r shor t i n th e
wir e (ST S line) :
Measur e voltag e betwee n PC M
connecto r terminal s C 6 an d A2 6
with th e ignitio n switc h i n th estar t positio n (III) .
NOTE : Transmissio n i n o r position .
Inspectio
n o f Starte r Switc h Sig -nal.
Thi s signal s th e PC M whe n th e engin e is cranking .
Starter Switc h Signa l
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Idle Contro l Syste m
Power Steerin g Pressur e (PSP ) Switc h Signa l
This signal s th e PC M whe n th e powe r steerin g loa d is high .
Inspectio n o f PS P switc h signal .
Chec k fo r a n ope n in th e wir e (PS P
S W line) :
1 . Tur n th e ignitio n switc h O N (II) .
2 . Measur e voltag e betwee n PC M
connecto r terminal s B 3 an d A26 .
I s ther e les s tha n 1.0V ?
NO
YE S
Chec k th e operatio n o f th e PS P
switch :
1 . Star t th e engine .
2. Tur n steerin g whee l t o ful llock .
3 . Measur e voltag e betwee n PC M
connecto r terminal s B 3 an d A26 .
I s ther e batter y voltage ?
NO
PC M CONNECTOR S
Chec k fo r a n ope n in th e wir e (PS P
S W Iine) :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e PS P switc h
connector .
3 . Tur n th e ignitio n switc h O N (II) .
4. A t th e wir e side , connec t th ePS P switc h connecto r termi -
nal s No . 1 an d No . 2 wit h a
jumpe r wire .
5 . Measur e voltag e betwee n PC M
connecto r terminal s B 3 an d A26 . Wir
e sid e o f femal e terminal s
PS P SWITC H CONNECTO R (C120 )
JUMPE RWIRE
Wire sid e o f femal e terminal s
I s ther e les s tha n 1.0V ?
NO
— Repai r ope n i n th e wire be-
twee n th e PC M (B3 ) an d th e
PS P switch .
— Repai r ope n i n wir e betwee n
the PC M (D22 ) and th e PS Pswitch .
(T o pag e 11-121 )
PS P switc h signa l i s OK .
YES
Replac e th e PS P switch .
YES
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