1996 ACURA RL KA9 Service Repair Manual

Troubleshooting
Barometric Pressur e (BARO ) Signa l
Diagnosti c Troubl e Cod e (DTC ) 3-5 : Barometri c Pressur e (BARO ) Signa l Diagnosi s
With engin e running , TC S indi -cato r ligh t i s ON .MIL is OFF .With th e SC S servic e connec -
to r connecte d (se e pag e
19-159 ), DT C 3- 5 is indicated .
Chec k fo r a shor t t o bod y groun d
i n th e BAR O circuit :
1 . Disconnec t th e PC M connecto r
D (22P ) an d TC S contro l uni t20P connectors .2. Chec k fo r continuit y betwee n
th e PC M connecto r D (22P ) ter -
mina l No . 3 an d bod y ground .
I s ther e continuity ?
Chec k th e BAR O circui t insid e
the PCM :1. Connec t th e PC M connecto rD (22P) .2. Tur n th e ignitio n switc h O N (II) .3. Measur e th e voltag e betwee n
th e PC M connecto r D (22P ) ter -
mina l No . 3 an d bod y ground .
I s ther e abou t 3 V ?
Chec k fo r a n ope n i n th e BAR Ocircuit :Measur e th e voltag e betwee n th eTC S contro l uni t 20 P connecto rterminal No . 1 3 an d bod y ground .
I s ther e abou t 3 V ?
Th e syste m is O K at thi s time .If th e proble m recurs , replac e
th e TC S contro l unit . NOTE
: Whe n bot h th e TC S indicato r
light an d th e MI L ar e ON , troubleshoo tthe PGM-F I syste m first .
PCM CONNECTO R D (22P )
Wir e sid e o f femal e terminal s
Repai r shor t t o bod y groun d in
th e wir e betwee n th e PC M an d
TC S contro l unit .
Chec k fo r loos e PC M connectors .If necessary , substitut e a known -good PC M an d recheck .
TCS CONTRO L UNI T 20 P CONNECTO R
Repai r ope n in th e wir e betwee n
th e PC M an d TC S contro l unit . Wir
e sid e o f femal e terminal s
ProCarManuals.com

Throttle Positio n Senso r (TPS ) Signa l
Diagnosti c Troubl e Cod e (DTC ) 3-6 : Throttl e Positio n Senso r (TPS ) Signa l Diagnosi s
With engin e running , TC S
indicato r ligh t i s ON .
MIL is OFF .With th e SC S servic e connec -
to r connecte d (se e pag e
19-159 ), DT C 3- 6 is indicated .NOTE
: Whe n bot h th e TC S indicato rlight an d th e MI L ar e ON , trouble -shoot th e PGM-F I syste m first .
TCS CONTRO L UNI T 14 P CONNECTO R
Check fo r a n ope n i n th e TP S cir -cuit :Measur e th e voltag e betwee n th e
TC S contro l uni t 14 P connecto r
termina l No . 1 4 an d bod y ground .
I s th e voltag e a s specified ?
Full y closed : abou t 0. 5 V
Full y open : abou t 4. 5 V Repai
r ope n in th e wir e betwee n
th e PC M an d TC S contro l unit . Wir
e sid e o f femal e terminal s
Th e syste m is O K at thi s time .
I f th e proble m recurs , replac e
th e TC S contro l unit .
ProCarManuals.com

Troubleshooting
TCS Contro l Valv e ( TCV ) Senso r Signa l
Diagnosti c Troubl e Cod e (DTC ) 3-7 : TC S Contro l Valv e ( TCV ) Senso r Signa l Diagnosi s
With engin e running , TC S
indicato r ligh t i s ON .
MIL is OFF .With th e SC S servic e connec -
to r connecte d (se e pag e
19-159 ), DT C 3- 7 is indicated .
Chec k fo r a n ope n i n th e VCC 2
circuit :
1 . Disconnec t th e TC S contro l
valv e senso r connector .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Measur e th e voltag e betwee n
termina l No . 3 an d bod yground .
Is ther e abou t 5V ?
Chec k fo r a n ope n in th e SG 2 cir -
cuit :
Measur e th e voltag e betwee n th e
TC S control valve senso r connec -
tor termina l No . 1 an d No . 3 .
Is ther e abou t B V ?
Chec k fo r a shor t t o bod y groun d
in th e TC V circuit :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e TC S contro l
unit 14 P connector .3. Tur n th e ignitio n switc h O N (II) .4. Chec k fo r continuit y betwee nthe TC S contro l valv e sensor
connecto r termina l No . 2 an d
bod y ground . NOTE
: Whe n bot h th e TC S indicato r
light an d th e MI L ar e ON , troubleshoo tthe PGM-F I syste m first .
TCS CONTRO L VALV ESENSO R CONNECTO R
Repair ope n i n th e wir e betwee n
th e PC M an d TC S contro l valv e
sensor .
Wire sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e PC M an d TC S contro l valv e
sensor .
Is ther e continuity ?
T o pag e 19-18 1 Repai
r shor t t o bod y groun d i n
th e wir e betwee n th e TC S contro l
uni t an d TC S contro l valv e sensor .
ProCarManuals.com

From pag e 19-18 0
Check th e TC S contro l valv e sen -sor:1. Remov e th e intak e ai r duc t(see pag e 19-192 ).2 . Tur n th e ignitio n switc h O N (II) .
3 . Connec t th e batter y an d TC S
contro l valv e actuato r (se e
pag e 19-189 ).
4 . Measur e th e voltag e betwee n
th e TC S control unit H P con -
necto r termina l No . 6 an d
bod y ground . TC
S CONTRO L UNI T 14 P CONNECTO R
Wir e sid e o f femal e terminal s
I s th e voltag e a s specified ?
Full y closed : abou t 0. 5 V
Full y open : abou t 4. 5 V
NOTE : Ther e shoul d b e a smoot h
transitio n fro m abou t 4. 5 V an d
0. 5 V as th e TC S contro l valv e is
closed .
Check fo r a n ope n i n th e wir e
betwee n th e TC S contro l uni t
and TC S contro l valv e sensor .If th e wir e is OK , replac e th e TC S
contro l valv e assembl y (fault y
TC S contro l valv e sensor ) an d
recheck .
The syste m is O K at thi s time .
I f th e proble m recurs , replac e
th e TC S contro l unit .
ProCarManuals.com