ACURA RL KA9 1996 Service Repair Manual
Manufacturer: ACURA, Model Year: 1996, Model line: RL KA9, Model: ACURA RL KA9 1996Pages: 1954, PDF Size: 61.44 MB
Page 1211 of 1954
Troubleshooting
TC-INH Signal (No PGM-FI DTC is indicated)
Check for a short to body ground
in the TC-INH circuit:
1. Disconnect the PCM connec-
tor C (12P) and TCS control
unit 14P connectors.
2. Check for continuity between
the PCM connector C (12P) ter-
minal No. 9 and body ground.
Is there continuity?
Check the PCM:
1. Connect the PCM connector C
(12P).
2. Start the engine.
3. Measure the voltage between
the PCM connector C (12P) ter-
minal No. 9 and body ground.
Does the tester needle swing
to about 2.5 V?
Check for an open in the TC-INH
circuit:
Measure the voltage between the
TCS control unit 14P connector
terminal No. 8 and body ground.
Does the tester needle swing
to about 2.5 V?
Check for loose TCS control unit
connectors. If necessary, substi-
tute a known-good TCS control
unit and recheck.
PCM CONNECTOR C (12P)
Repair short to body ground in
the wire between the PCM and
TCS control unit.
Wire side of female terminals
NOTE: Check under the following condi-
tions.
The coolant temperature is above 32°F
(0°C).
The MIL does not come on.
NOTE: Use the 10 V range or a similar
range in an analog tester.
Check for loose PCM connectors.
If necessary, substitute a known-
good PCM and recheck.
NOTE: Check under the following condi-
tions.
The coolant temperature is above 32°F
(0°C).
The MIL does not come on.
NOTE: Use the 10 V range or a similar
range in an analog tester.
TCS CONTROL UNIT UP CONNECTOR
Repair open in the wire between
the PCM and TCS control unit.
Wire side of female terminalsProCarManuals.com
Page 1212 of 1954
PGM-FI DTC : 3 5 (TC-ST B signa l doe s no t matc h TC-F C signal )
Check fo r a shor t t o bod y groun d
i n th e TC-ST B circuit :
1 . Disconnec t th e PC M connec -
to r C (12P ) an d TC S contro l
uni t 14 P connectors .
2 . Chec k fo r continuit y betwee n
th e TC S contro l uni t U P con -
necto r termina l No . 1 0 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 ther e continuity ? 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 .
TCS CONTRO L UNI T 20 P CONNECTO R
Chec k fo r a shor t t o bod y groun d
i n th e TC-F C circuit :
1 . Disconnec t th e TC S contro l
uni t 20 P connector .
2 . Chec k fo r continuit y betwee n
termina l No . 1 4 an d bod y
ground .
Is ther e continuity ?Repair 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 . Wir
e sid e o f femal e terminal s
Chec k th e TC S contro l uni t (TC -
STB) :1. Connec t th e TC S contro l uni t
14 P an d 20 P connector s an d
PC M connecto r C (12P) .
2 . Rais e th e fron t o f th e vehicle ,
and suppor t i t wit h safet ystands.
3 . Star t th e engine .
4 . Measur e th e voltag e betwee n
th e TC S contro l uni t 14 P con -
necto r termina l No . 1 0 an d
bod y ground . TC
S CONTRO L UNI T U P CONNECTO R
Wir e sid e o f femal e terminal s
I s th e voltag e a s specified ?
TCS is functioning :about 0 V
TC S is no t functioning :
abou t 5 V Chec
k fo r loos e TC S contro l uni t
connectors . I f necessary , substi -
tut e a known-goo d TC S contro l
uni t an d recheck .
To pag e 19-17 4
NOTE : Sto p th e wheel s b y depressin g
th e brak e peda l lightly .
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Page 1213 of 1954
Troubleshooting
PGM-FI DTC : 3 5 (TC-ST B signa l doe s no t matc h TC-F C signal ) (cont'd )
From pag e 19-17 3
Chec k th e TC S contro l uni t (TC -
FC):Measur e th e voltag e betwee n th eTC S contro l uni t 20 P connecto rterminal No . 1 4 an d bod y ground .NOTE
: Us e th e 1 0 V rang e o r a simila r
rang e in a n analo g tester .
TCS IS NO T TC S ISFUNCTIONIN G FUNCTIONIN G
TCS CONTRO L UNI T 20 P CONNECTO R
Check fo r loos e TC S contro l uni tconnectors . I f necessary , substi -tute a known-goo d TC S contro l
uni t an d recheck .
NOTE : Sto p th e wheel s b y depressin g
th e brak e peda l lightly .
Check fo r a n ope n i n th e TC-ST Bcircuit:Measur e th e voltag e betwee n th e
PC M connecto r C (12P ) termina l
No. 1 2 an d bod y ground .
Wire sid e o f femal e terminal s
PC M CONNECTO R C (12P )
I s ther e abou t 5 V whe n TC S is
no t functioning ? Repai
r ope n in th e wir e betwee n
th e TC S contro l uni t an d PCM . Wir
e sid e o f femal e terminal s
Check fo r a n ope n i n th e TC-F Ccircuit :
Measur e th e voltag e betwee n th e
PC M connecto r C (12P ) termina lNo. 1 0 an d bod y ground . NOTE
: Us e th e 1 0 V rang e o r a simila r
rang e in a n analo g tester .
TCS IS NO T TC S ISFUNCTIONIN G FUNCTIONIN G
I s ther e abou t 4. 5 V whe n TC S is
no t functioning ? Repai
r ope n in th e wir e betwee n
th e TC S contro l uni t an d PCM .
Chec k fo r loos e PC M connectors .
I f necessary , substitut e a known -
goo d PC M an d recheck .
TC
S is functionin g (maximum) :
abou t 1.5 V
TC S is no t functioning :
abou t 4. 5 V
I
s th e voltag e a s specified ?
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Page 1214 of 1954
![ACURA RL KA9 1996 Service Repair Manual
PGM-FI DTC: 36 [TC-FC signal (High-Low check)]
Check for a short to body ground
in the TC-FC circuit:
1. Disconnect the PCM connec-
tor C (12P) and TCS control
unit 20P connectors.
2. Check for](/img/32/56992/w960_56992-1213.png "ACURA RL KA9 1996 Service Repair Manual
PGM-FI DTC: 36 [TC-FC signal (High-Low check)]
Check for a short to body ground
in the TC-FC circuit:
1. Disconnect the PCM connec-
tor C (12P) and TCS control
unit 20P connectors.
2. Check for")
PGM-FI DTC: 36 [TC-FC signal (High-Low check)]
Check for a short to body ground
in the TC-FC circuit:
1. Disconnect the PCM connec-
tor C (12P) and TCS control
unit 20P connectors.
2. Check for continuity between
the TCS control unit 20P con-
nector terminal No. 14 and
body ground.
TCS CONTROL UNIT 20P CONNECTOR
Is there continuity?
Repair short to body ground in
the wire between the PCM and
TCS control unit.
Wire side of female terminals
TCS IS NOT TCS IS
FUNCTIONING FUNCTIONING
NOTE: Use the 10 V range or a similar
range in an analog tester.
Is there about 4.5 V when TCS is
not functioning?
Check for loose TCS control unit
connector. If necessary, substi-
tute a known-good TCS control
unit and recheck.
Check for an open in the TC-FC
circuit:
Measure the voltage between the
PCM connector C (12P) terminal
No. 10 and body ground.
NOTE: Use the 10 V range or a similar
range in an analog tester.
TCS IS NOT TCS IS
FUNCTIONING FUNCTIONING
PCM CONNECTOR C (12P)
Is there about 4.5 V when TCS is
not functioning?
Repair open in the wire between
the TCS control unit and PCM.
Wire side of female terminals
Check for loose PCM connectors.
If necessary, substitute a known-
good PCM and recheck.
Check the TCS control unit:
1. Connect the TCS control unit
20P connector.
2. Turn the ignition switch ON
(II).
3. Measure the voltage between
the TCS control unit 20P con-
nector terminal No. 14 and
body ground.ProCarManuals.com
Page 1215 of 1954
Troubleshooting
Engine Spee d (NEP ) Signa l
Diagnosti c Troubl e Cod e (DTC ) 3-2 : Engin e Spee d (NEP ) Signa l Diagnosi s
With engin e running , TC S indi -
cato r ligh t i s ON .
Wit h th e SC S servic e connec -
to r connecte d (se e pag e
19-159 ), DT C 3- 2 is indicated .
Chec k fo r a shor t t o bod y groun d
i n th e NE P circuit :
1. Disconnec t th e TC S contro l uni t20P , PC M C (12P ) an d gaug e
assembl y 22 P connectors .
2 . Chec k fo r continuit y betwee n
th e PC M connecto r C (12P ) ter -
mina l No . 8 an d bod y ground .
Is ther e continuity ?
Is ther e abou t 6 V ?
Chec k fo r a n ope n in th e NE P cir -
cuit :
Measur e th e voltag e betwee n th e
TC S contro l uni t 20 P connecto rterminal No . 1 2 an d bod y ground .
Is ther e abou t 6 V ?
Th e syste m is O K a t thi s time .
I f th e proble m recurs , replac e
the TC S contro l unit .
PCM CONNECTO R C (12P )
Wir e sid e o f femal e terminal s
Repai r shor t t o bod y groun d i n
th e wir e betwee n th e TC S contro l
unit , PC M an d gaug e assembly .
Chec k fo r loos e PC M connectors .
I f necessary , substitut e a known -
goo d PC M an d recheck .
NOTE :
Us e th e 1 0 V rang e o r a simila r rang e in a n
analo g tester .
Chec k wit h th e engin e idlin g an d warmed-up .TC
S 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 .
Wire sid e o f femal e terminal s
Chec
k th e PCM :
1 . Connec t th e PC M connecto r
C(12P).2. Star t th e engine .3. Measur e th e voltag e betwee nthe PC M connecto r C (12P ) ter -mina l No . 8 an d bod y ground .
Use th e 1 0 V rang e o r a simila r rang e in a n
analo g tester .
Check wit h th e engin e idlin g an d warmed-up .
NOTE:
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Page 1216 of 1954
Reference Voltag e (VREF ) Signa l
Diagnosti c Troubl e Cod e (DTC ) 3-4 : Referenc e Voltag e (VREF ) Signa l Diagnosi s
With engin e running , TC S indi -
cato r ligh t i s ON .
Wit h th e SC S servic e connec -
to r connecte d (se e pag e
19-159 ), DT C 3- 4 is indicated .
Chec k fo r a shor t t o bod y groun d
i n th e VRE F circuit :
1 . Disconnec t th e PC M connec -
to r D (22P ) an d TC S contro l
uni t 14 P connectors .
2 . Chec k fo r continuit y betwee n
th e PC M connecto r D (22P ) ter -
mina l No . 2 0 an d bod y ground .
I s ther e continuity ?
I s ther e abou t 5 V ?
Chec k fo r a n ope n i n th e VRE F
circuit :
Measur e th e voltag e betwee n th e
TC S contro l uni t 14 P connecto rterminal No . 1 2 an d bod y ground .
I s ther e abou t 5 V ?
Th e syste m is O K a t thi s time .
I f th e proble m recurs , replac e
th e TC S contro l unit . PC
M CONNECTO R D (22P )
Repai r shor t t o bod y groun d i n
th e wir e betwee n th e PC M an d
TC S contro l unit .
Wire sid e o f femal e terminal s
Check fo r loos e PC M connectors .
I f necessary , substitut e a known -
good PC M an d recheck .
TCS CONTRO L UNI T 14 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
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Page 1217 of 1954
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
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Page 1218 of 1954
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
Page 1219 of 1954
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
Page 1220 of 1954
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 .
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