ACURA RL KA9 1996 Service Repair Manual

Troubleshooting
DTC 92 : VS A Converte r Uni t (cont'd )
(From pag e 19-255 )
The syste m is O K a t thi s time .
Replac e th e VS A converte r unit .
Replac e th e VS A modulator -
control unit .
Is DT C 92 indicated ?
Check th e VS A converte r unit :
1 . Substitut e a known-goo d VS A
converte r unit .2. Connec t al l o f disconnecte dconnector.3. Clea r th e DTC .4. Test drive the vehicle.5. Verif y th e DTC .
I
s DT C 9 2 indicated ?
Proble
m verification :
1 . Connec t al l o f disconnecte d
connector .
2 . Clea r th e DTC .
3. Test drive the vehicle.4. Verif y th e DTC .
ProCarManuals.com

DTC 93: Throttle Position Sensor/Steering Angle Sensor
NOTE: When both the VSA indicator and the MIL are ON, troubleshoot the PGM-FI system first.
Check for an open in the THL1circuit:1. Turn the ignition switch ON (II).
2. Measure the voltage between
the VSA converter unit 26Pconnector terminal No. 7 and body ground when the throt-
tle valve is fully closed and
fully open.
Is the voltage as specified?
— Fully closed: about 0.5 V
— Fully open: about 4.5 V
Check the steering angle sensor
4P connector connection.
Is the connector disconnected?
Check for an open in the steering
angle sensor circuits:
1. Turn the ignition switch OFF.2. Disconnect the VSA controlunit 42P connector and thesteering angle sensor 4P con-nector.
3. Check for continuity between
the VSA control unit 42P con-nector terminal No. 39 and
the steering angle sensor 4P
connector terminal No. 4.
4. Check for continuity between
the VSA control unit 42P con-nector t e r m i n a l No. 21 and
the steering angle sensor 4P
connector terminal No. 1.
5. Check for continuity between
the VSA control unit 42P con-nector terminal No. 24 and
the steering angle sensor 4P
connector terminal No. 2.
6. Check for continuity between
the VSA control unit 42P con-nector terminal No. 40 and
the steering angle sensor 4P
connector terminal No. 3.
Is there continuity?
The system is OK at this time. If the problem recurs, replace
the VSA converter unit. VSA CONVERTER UNIT 26P CONNECTOR
Repair open in the wire between
the PCM and the VSA converter unit.
Connect the steering angle sen-
sor 4P connector. VSA CONTROL UNIT 42P CONNECTORWire side of female terminals
STEERING ANGLE SENSOR 4P CONNECTOR Wire side of female terminals
Repair open in the wire between
the steering angle sensor and
the VSA control unit. Wire side of female terminals
YRSA YM
(RED/WHT) CAN (-)
(WHT)
CAN (+) (RED) YRSA YU
(RED/BLU)
ProCarManuals.com

Troubleshooting
DTC 94 : TC S Contro l Valv e Senso r
NOTE: Whe n bot h th e VS A syste m indicato r an d th e MI L ar e ON , troubleshoo t th e PGM-F I syste m first .
Chec k fo r a n ope n in th e VCC 2
circuit :
1 . Disconnec t th e TC S contro l
valv e senso r 3 P connector .
2 . Tur n th e ignitio n switc h O N (II) .
3 . Measur e th e voltag e betwee n
th e TC S contro l valv e senso r
3P connecto r termina l No . 3an d bod y ground .
Is ther e abou t 5 V ?
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 contro l valv e senso r 3 P con -necto r termina l No . 1 an d No . 3 .
Is ther e abou t 5 V ?
Chec k fo r a shor t t o bod y groun d
i n th e THL 2 circuit :
1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e VS A converte runit 26 P connector .
3 . Chec k fo r continuit y betwee n
th e TC S contro l valv e senso r
3 P connecto r termina l No . 2
an d bod y ground .
I s ther e continuity ?
Chec k fo r a n ope n i n th e THL 2
circuit :
Chec k fo r continuit y betwee n th e
VS A converte r uni t 26 P connec -
to r termina l No . 5 an d th e TC S
contro l valv e senso r 3 P connec -
to r termina l No . 2 .
I s ther e continuity ?
(T o pag e 19-259 )
TCS CONTRO L VALV ESENSO R 3 P CONNECTO R
Repair ope n in th e wir e betwee nthe PC M an d th e TC S contro lvalve 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 th e TC S contro l
valve sensor .
Repair shor t t o bod y groun d in
th e wir e betwee n th e TC S con -
tro l valv e senso r an d th e VS A
converte r unit . VS
A CONVERTE R UNI T 26 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e TC S contro l valv e senso r an d
th e VS A converte r unit .
ProCarManuals.com

(From pag e 19-258 )
Chec k th e TC S contro l valv e sen -
sor:1. Remov e th e intak e ai r duc t
(se e pag e 19-272 ).
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 actuator .
4 . Measur e th e voltag e betwee n
th e VS A converte r uni t 26 P
connecto r termina l No . 5 an d
bod y ground .
TCS CONTRO L VALV E
ACTUATO R 2 P CONNECTO R
Terminal sid e o f
mal e terminal s
BATTER Y
CAUTION :
• B e carefu l no t t o shor t th e terminals .
• Afte r checking , disconnec t th e terminals .VSA CONVERTE R 26 P CONNECTO R
Is 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 to
0. 5 V as th e TC S contro l valv e is
closed . Wir
e sid e o f femal e terminal s
Replac e th e TC S contro l valv e
senso r (fault y TC S contro l valv e
sensor) .
The syste m is O K a t thi s time .
I f th e proble m recurs , replac e
th e VS A converte r unit .
ProCarManuals.com

Troubleshooting
DTC 95 : Precharg e Pum p Moto r
Chec k th e VS A MOTO R (40A )fuse in th e under-hoo d fuse/rela y
box , an d reinstal l th e fus e i f i t i s
OK .
Is th e fus e OK ?
Chec k fo r a n ope n i n th e +B-M Rcircuit:1. Disconnec t VS A contro l uni t42P connector.2. Measur e th e voltag e betwee n
termina l No . 2 an d bod y
ground .
Is ther e batter y voltage ?
Check fo r a n ope n i n th e M-GN Dcircuit:Check fo r continuit y betwee n th e
VS A contro l uni t 42 P connecto r
termina l No . 1 an d bod y ground .
I s ther e continuity ?
Chec k fo r a shor t t o powe r i n th e
VL P circuits :1. Disconnec t th e precharg e
pum p moto r 2 P connector .
2 . Tur n th e ignitio n switc h O N
(II).3. Measur e th e voltag e betwee nbody groun d an d th e VS Acontro l uni t 42 P connecto rterminals No . 3 an d No . 4individually .
I s ther e batter y voltage ?
(To pag e 19-261 )
Replac e th e fuse , an d recheck .If th e fus e i s blown , chec k fo r ashor t t o bod y groun d in thi s fus ecircuit . I f th e circui t i s OK , replac ethe VS A modulator-contro l unit .
VSA CONTRO L UNI T 42 P CONNECTO R
Repair ope n i n th e wir e
betwee n th e VS A contro l uni t
an d bod y ground .
Repair poo r groun d (G401 ,G402).
Repair shor t t o powe r i n th e wir e
betwee n th e precharg e pum p
moto r an d th e VS A contro l unit . Wir
e sid e o f femal e terminal s
ProCarManuals.com

(From pag e 19-260 )
Check fo r a shor t t o bod y groun din th e VL P circuits :
1 . Tur n th e ignitio n switc h OFF .
2 . Chec k fo r continuit y betwee n
bod y groun d an d th e VS A
contro l uni t 42 P connecto rterminals No . 3 an d No . 4
individually .
Is ther e continuity ?
Check fo r a n ope n in th e VL P cir -cuits :1. Chec k fo r continuit y betwee n
th e VS A contro l uni t 42 P con -
necto r termina l No . 3 an d th e
precharg e pum p moto r 2 P
connecto r termina l No . 2 .
2 . Chec k fo r continuit y betwee n
th e VS A control unit 42 P con -
necto r termina l No . 4 an d th eprecharg e pum p moto r 2 P
connecto r termina l No . 1 .
Is ther e continuity ?
Check th e precharg e pum pmotor:1. Substitut e a known-goo d
precharg e pum p motor .
2 . Connec t al l o f disconnecte d
connector .
3. Clea r th e DTC .4. Test-driv e th e vehicle .
5 . Verif y th e DTC .
I s DT C 95 indicated ? VS
A CONTRO L UNI T 42 P CONNECTO R
Repair shor t t o bod y groun d in th ewir e betwee n th e precharg e pum p
moto r an d th e VS A contro l unit .
Repai r ope n in th e wir e betwee n
th e precharg e pum p moto r an d
th e VS A contro l unit . Wir
e sid e o f
femal e terminal s
Replac e th e precharg e pum p
motor .
Replac e th e VS A modulator -
contro l unit .
PRECHARG E PUM P MOTO R2P CONNECTO R
ProCarManuals.com

Troubleshooting
DTC 96 , 97 : TC S Contro l Valv e Actuato r
Check th e TC S (20A ) fus e i n th e
under-hoo d fuse/rela y box , an d
reinstal l th e fus e if i t i s OK .
I s th e fus e OK ?
Chec k th e EC U (20A ) fus e i n th eunder-das h fus e rela y box , an d
reinstal l th e fus e if i t i s OK .
I s th e fus e OK ?
Chec k th e su b throttl e moto r fail -
saf e rela y i n th e under-hoo d
rela y bo x C , an d leav e th e fail -
saf e rela y remove d (se e
section 23 ).
Is th e rela y OK ?
Chec k fo r a n ope n i n th e su b
throttl e moto r fail-saf e rela y + B
circuit :1. Tur n th e ignitio n switc h O N (II) .2. Measur e th e voltag e betwee nbody groun d an d th e su bthrottl e moto r fail-saf e rela y4P connecto r terminal s No . 2an d No . 4 individually .
Is ther e batter y voltage ?
Chec k fo r a shor t t o bod y groun d
in th e su b throttl e moto r fail-saf erelay circuit :1. Tur n th e ignitio n switc h OFF .2. Disconnec t th e VS A converte runit 26 P connector .3. Chec k fo r continuit y betwee nbody groun d an d th e VS Aconverte r uni t 26 P connecto r
terminal s No . 1 2 an d No . 1 4
individually .
I s ther e continuity ?
(To pag e 19-263 )
Replace th e fus e an d recheck .
I f th e fus e i s blown , chec k fo r a
shor t t o bod y groun d in thi s fus e
circuit .
Replac e th e fus e an d recheck .
I f th e fus e i s blown , chec k fo r a
shor t t o bod y groun d in thi s fus e
circuit .
Replac e th e su b throttl e moto rfail-saf e relay .SUB THROTTL E MOTO R FAIL-SAF ERELAY 4 P CONNECTO R
Repair ope n in th e wir e betwee n
th e su b throttl e moto r fail-saf e
relay an d TC S (20A ) fus e o r EC U(20A ) fuse .
Wire sid e o f femal e terminal s
VS A CONVERTE R UNI T 26 P CONNECTO R
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 su b throt -
tl e moto r fail-saf e rela y an d th e
VS A converte r unit .
ProCarManuals.com

(From pag e 19-262 )
Chec k fo r a n ope n in th e fail-saf e
rela y circuits :
1 . Chec k fo r continuit y betwee n
th e VS A converte r uni t 26 P
connecto r termina l No . 1 2
and th e su b throttl e moto rfail-saf e rela y 4 P connecto r
termina l No . 3 .
2 . Chec k fo r continuit y betwee n
th e VS P contro l uni t 26 P con -
necto r termina l No . 1 4 an d th e
su b throttl e moto r fail-saf e
rela y 4 P connecto r termina l
No. 1 .
Is ther e continuity ?
I s ther e batter y voltage ?
Chec k fo r shor t t o bod y groun d
i n th e ST M circuits :
1 . Tur n th e ignitio n switc h OFF .
2 . Chec k fo r continuit y betwee n
bod y groun d an d th e VS A
converte r uni t 26 P connecto r
terminal s No . 3 an d No . 1 6
individually .
Is ther e continuity ?
(T o pag e 19-264 ) VS
A CONVERTE R UNI T 26 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e fail-saf e rela y an d th e VS A
contro l unit . SU
B THROTTL E MOTO R
FAIL-SAF E RELA Y4P CONNECTO RWire sid e o f femal e terminal s
VS A CONVERTE R UNI T 26 P CONNECTO R
Wir e sid e o f femal e terminal s
Repai r shor t t o powe r i n th e wir e
betwee n th e TC S contro l valv e
actuato r an d th e VS A converte r
unit.
Repai r shor t t o bod y groun d i n
th e wir e betwee n th e TC S con -
tro l valv e actuato r an d th e VS A
converte r unit .
ProCarManuals.com

Troubleshooting
DTC 96 , 97 : TC S Contro l Valv e Actuato r (cont'd )
(From pag e 19-263 )
VSA CONVERTE R UNI T 26 P CONNECTO R
Chec k fo r a n ope n in th e ST M cir -
cuits :
1 . Chec k fo r continuit y betwee n
th e VS A converte r uni t 26 P
connecto r termina l No . 3 an d
TC S contro l valv e actuato r 2 P
connecto r termina l No . 2 .
2 . Chec k fo r continuit y betwee n
the VS A converte r uni t 26 Pconnecto r termina l No . 1 6 an dTCS contro l valv e actuato r 2 Pconnecto r termina l No . 1 . Wir
e sid e o f femal e terminal s
TCS CONTRO L VALV EACTUATO R 2 P CONNECTO R
Is ther e continuity ? Repai
r ope n i n th e wir e betwee n
th e TC S contro l valv e actuato r
and th e VS A converte r unit .
Wire sid e o f
femal e terminal s
Chec k th e TC S contro l valv e
operation :
Connec t th e batter y powe r t o th e
TC S contro l valv e actuato r 2 P
connecto r termina l No . 1 , an d
groun d connecto r termina l No . 2
fo r on e second . CAUTION
:
• B e carefu l no t t o shor t th e terminals .
• Afte r checking , disconnec t th e termi -
nals.
TCS CONTRO L VALV EACTUATO R 2 P CONNECTO R
Does th e TC S contro l valv e
operat e smoothly ? Replac
e th e TC S contro l valv eassembly .
Check fo r loos e terminal s i n th e
VS A converte r uni t 26 P connector .
I f necessary , substitut e a known -
goo d VS A converte r unit , an d
recheck .
Termina l sid e o f
mal e terminal s
BATTER Y
ProCarManuals.com

DTC 98 : Differen t Mode l
Does th e MI L sta y ON?
Chec k fo r a n ope n in th e IG 2 cir -
cuit :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e VS A converte r
uni t 26 P connector .
3 . Tur n th e ignitio n switc h O N (II) .
4 . Measur e th e voltag e betwee n
th e VS A converte r uni t 26 P
connecto r termina l No . 1 0
an d bod y ground .
I s ther e batter y voltage ?
Chec k fo r a shor t t o bod y groun d
i n th e SDL A circuit :
1 . Tur n th e ignitio n switc h OFF .
2 . Disconnec t th e PC M connecto r
E (26P) .3. Chec k fo r continuit y betwee nthe VS A converte r uni t 26 Pconnecto r termina l No . 9 an d
bod y ground .
I s ther e continuity ?
Chec k fo r a n ope n i n th e SDL A
circuit :Check fo r continuit y betwee n th e
VS A converte r uni t 26 P connecto r
termina l No . 9 an d th e PC M con -
necto r E (26P ) termina l No . 20 .
I s ther e continuity ?
(T o pag e 19-266 ) Prefor
m th e troubleshootin g fo r
th e PGM-F I system .
VSA CONVERTE R UNI T 26 P CONNECTO R
IG2 (YEL/BLK )
Wire sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e under-das h fuse/rela y bo x
an d th e VS A converte r unit .
Repai r shor t t o bod y groun d in
th e wir e betwee n th e PC M an d
th e VS A converte r unit .
PCM CONNECTO R E (26P )
Repai r ope n in th e wir e betwee n
th e PC M an d th e VS A converte r
unit.Wire sid e o f femal e terminal s
ProCarManuals.com