ACURA RL KA9 1996 Service Repair Manual

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

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 .
ProCarManuals.com

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 ?
ProCarManuals.com

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

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:
ProCarManuals.com

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
ProCarManuals.com

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