1996 ACURA RL KA9 Service Repair Manual

Electrical Troubleshootin g
Troubleshooting Flowchar t — Vehicl e Spee d Senso r (VSS )
• OB D II Sca n Too l indicate s Cod eP1791 .• Self-diagnosi s indicato r ligh t
blink s fou r times .
Possibl e Caus e
• Disconnecte d vehicl e spee dsensor (VSS ) connecto r• Shor t o r ope n in VS S wir e
• Fault y VS S
Chec k tha t th e speedomete r oper -
ate s correctly .
Doe s th e speedomete r operate ? Refe
r t o sectio n 2 3 fo r vehicl e
spee d senso r (VSS ) test .
Chec k th e VS S Voltage :
1. Tur n th e ignitio n switc h OFF .2. Rais e th e vehicle .3. Shif t th e transmissio n t o
position .
4 . Disconnec t th e A (26P ) an d B
(16P ) connector s fro m th ePCM .5. Tur n th e ignitio n switc h O N (II) .
6 . Rotat e th e fron t whee l an d
chec k fo r th e voltag e betwee n
the B1 3 an d A2 6 terminals .NOTE: Bloc k th e othe r whee lso i t doe s no t tur n o r yo u wil lget incorrec t tes t results . •
Mak e sur e lifts , jack s an d safet y stand s ar e place d properl y (se e sectio n 1 ).
• Se t th e parkin g brak e securely , an d bloc k th e rea r wheels .
• Jac k u p th e fron t o f th e vehicle , an d suppor t i t wit h safet y stands .
Doe s 0 V and approx . 5 V or mor e
appea r alternately ? Chec
k fo r ope n i n th e wir e
betwee n th e B1 3 termina l an d
th e vehicl e spee d senso r (VSS) . I f
wir e i s OK , chec k th e VS S (se e
sectio n 23 ).
Chec k fo r loos e PC M connectors .
I f necessary , substitut e a known -
goo d PC M an d recheck . PC
M CONNECTOR S
Wir e sid e o f femal e terminal s
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Troubleshooting Flowchar t — Transmissio n Rang e (A/ T Gea r Position )
Switc h (Short )
• OB D II Sca n Too l indicate s Cod eP1705 .• Self-diagnosi s indicato r ligh t
blink s fiv e times . Possibl
e Caus e
• Shor t i n transmissio n rang e
switc h wir e
• Fault y transmissio n rang e switc h
NOTE : Cod e P170 5 (5 ) i s cause d whe n
th e PC M receive s tw o gea r positio n
inputs a t th e sam e time .
Observ e th e A/ T Gea r Positio n
Indicator :
1. Tur n th e ignitio n switc h O N (II) .2. Observ e th e A/ T gea r positio nindicator , an d shif t eac h posi -tion separately .
Does an y indicato r sta y o n
whe n th e shif t leve r i s no t i n
tha t position ? Th
e syste m is O K a t thi s time .
Chec k th e wir e harnes s fo r dam -
age.
Disconnec t th e transmissio n
rang e switc h connector .
D o al l gea r positio n indica -
tor s g o out ? Replac
e th e transmissio n rang e
switch .
PCM CONNECTOR S
Measur e AT P R Voltage :
1. Shif t t o al l position s othe rthan
2 . Measur e th e voltag e betwee n
the E 7 an d A2 6 terminals .
Is ther e approx . 1 0 V ?
To pag e 14-6 4
Chec k fo r shor t i n th e wir ebetwee n th e E 7 termina l an d th etransmissio n rang e switc h o r A/ T
gea r positio n indicator . I f wir e i s
OK , chec k fo r loos e PC M connec -
tors . I f necessary , substitut e a
known-goo d PC M an d recheck . Wir
e sid e o f femal e terminal s
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Electrical Troubleshootin g
Troubleshooting Flowchar t — Transmissio n Rang e (A/ T Gea r Position )
Switc h (Short ) (cont'd )
From pag e 14-6 3
I s ther e approx . 1 0 V ?
Measur e AT P D 4 Voltage :1. Shif t t o al l position s othe r tha n
2 . Measur e th e voltag e betwee n
th e E 8 an d A2 6 terminals .
I s ther e approx . 1 0 V ?
Measur e AT P 0 3 Voltage :
1. Shif t t o al l position s othe rthan
2 . Measur e th e voltag e betwee n
the E 9 an d A2 6 terminals .
Is ther e approx . 1 0 V ?
T o pag e 14-6 5 Chec
k fo r shor t i n th e wir e
betwee n th e E2 4 termina l an d th e
A/ T gea r positio n indicator , o r a
shor t i n th e wire s betwee n th e
A/ T gea r positio n indicato r an d
th e transmissio n rang e switch . I f
wire s ar e OK , chec k fo r loos e PC M
connectors . I f necessary , substi -
tut e a known-goo d PC M an d
recheck .
Check fo r shor t i n th e wir e
betwee n th e E 8 termina l an d th e
transmissio n rang e switch . I f wir e
is OK , chec k fo r loos e PC M con -nectors . I f necessary , substitut e
a known-goo d PC M an d recheck .
Chec k fo r shor t i n th e wir e
betwee n th e E 9 termina l an d th e
transmissio n rang e switc h o r A/ T
gea r positio n indicator . I f wir e i s
OK , chec k fo r loos e PC M connec -
tors . I f necessary , substitut e a
known-goo d PC M an d recheck . PC
M CONNECTOR S
Wir e sid e o f femal e terminal s
Measur
e AT P P N Voltage :
1 . Shif t t o al l position s othe r
than
2 . Measur e th e voltag e betwee n
th e E2 4 an d A2 6 terminals .
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