ACURA RL KA9 1996 Service Repair Manual

Troubleshooting
DTC 26 : Latera l Acceleratio n Senso r
Check th e wheels , tires , suspen -sion, an d alignment .
Do thes e component s mee t
th e norma l standards ?
Chec k fo r installatio n directio n o f
th e ya w rate/latera l acceleratio n
sensor.The senso r connecto r sid e mus t
b e facin g backward .
Is i t correct ?
Check fo r a shor t t o powe r i n th eAY circuit :1. Disconnec t th e VS A contro lunit 42 P connector , th e ya wrate/latera l acceleratio n sen -
so r 6 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 VS A contro l uni t 42 P con -
necto r termina l No . 8 an d bod y
ground .
Is ther e batter y voltage ?
Chec k fo r a shor t t o bod y groun d
i n th e A Y circuit :
1. Tur n th e ignitio n switc h OFF .2. Chec k fo r continuit y betwee n
th e VS A contro l uni t 42 P con -
necto r termina l No . 8 an d bod y
ground .
I s ther e continuity ?
(To pag e 19-227 )
Repair t o norma l standards .
Reinstall th e ya w rate/latera lacceleration senso r correctly .
VSA CONTRO L UNI T 42 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 ya w rate/latera l
acceleration senso r an d th e VS Acontro l unit .
Repai r shor t t o bod y groun d in th ewir e betwee n th e ya w rate /lateral acceleratio n senso r a n d th e
VS A contro l unit .
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(From pag e 19-226 )
Check fo r an ope n i n th e A Y cir -cuit :
Chec k fo r continuit y betwee n th e
VS A contro l uni t 42 P connecto r
termina l No . 8 an d th e ya w rate /
latera l acceleratio n senso r 6 P
connecto r termina l No . 5 .
I s ther e continuity ?
Chec k fo r a n ope n in th e YRS A
YU circuit :Check fo r continuit y betwee n th e
VS A contro l uni t 42 P connecto r
termina l No . 3 9 an d th e ya w rate /
latera l acceleratio n senso r 6 P
connecto r termina l No . 1 .
I s ther e continuity ?
Chec k fo r a n ope n in th e YRS A
Y M circuit :
Chec k fo r continuit y betwee n th e
VS A contro l uni t 42 P connecto r
termina l No . 2 1 an d th e ya w rate /
latera l acceleratio n senso r 6 Pconnecto r termina l No . 4 .
I s ther e continuity ?
Chec k th e latera l acceleratio n
sensor:1. Substitut e a known-goo d ya wrate/latera l acceleratio n sen -sor.2. Connec t al l o f disconnecte d
connector .
3. Clea r th e DTC .4. Tes t driv e th e vehicl e aroun d anumbe r o f corners .5. Verif y th e DTC .
I s DT C 2 6 indicated ? VS
A CONTRO L UNI T 42 P CONNECTO R
Repai r ope n in th e wir e betwee n
th e ya w rate/latera l acceleratio n
senso r an d th e VS A contro l unit . Wir
e sid e o f femal e terminal s
YAW RATE/LATERA LACCELERATION SENSO R6P CONNECTO R
Wire sid e o f femal e terminal s
Repai r ope n in th e wir e betwee n
th e ya w rate/latera l acceleratio n
senso r an d th e VS A contro l unit .
Replac e th e ya w rate/latera l
acceleratio n sensor .
Replac e th e VS A modulato r con -
tro l unit . Repai
r ope n in th e wir e betwee n
th e ya w rate/latera l acceleratio n
senso r an d th e VS A contro l unit .
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Troubleshooting
DTC 27: Steering Angle Sensor
Perform the steering angle sen-
sor neutral position check proce-
dure (see page 19-268).
Is it OK?
Check the steering angle sensor
installation.
Is it correct?
Check for a short to power in the CAN circuit:
1. Disconnect the VSA control unit 42P connector, the steer-
ing angle sensor 4P connector
and the VSA converter unit
26P connector.2. Turn the ignition switch ON (II).
3. Measure the voltage between body ground and the VSA con-
trol unit 42P connector terminalNo. 24 and 40 individually.
Is there battery voltage?
Is there continuity?
Check for an open in the YRSA
YU circuit:
Check for continuity between the
VSA control unit 42P connector
terminal No. 39 and the steering angle sensor 4P connector termi-
nal No. 4.
Is there continuity?
(To page 19-229)
Perform the steering angle sen-
sor neutral position memorizing
procedure (see page 19-268).
Install the steering angle sensorcorrectly.
VSA CONTROL UNIT 42P CONNECTOR
Repair short to power in the wire
between the steering angle sen-
sor and the VSA control unit.
Wire side of female terminals
Repair short to body ground in
the wire between the steeringangle sensor and the VSA con-trol unit.
Repair open in the wire between
the steering angle sensor and the VSA control unit.STEERING ANGLE SENSOR4P CONNECTOR
Wire side of female terminals
Check for a short to body ground
in the CAN circuit:1. Turn the ignition switch OFF.
2. Check for continuity between body ground and the VSA con-
trol unit 42P connector terminal
No. 24 and 40 individually.
(RED/BLU)
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(From page 19-228)
Check for an open in the YRSAYM circuit:
Check for continuity between the
VSA control unit 42P connector
terminal No. 21 and the steering angle sensor 4P connector termi-
nal No. 1.
Is there continuity?
Check for an open in the CAN (+)
circuit:
Check for continuity between the
VSA control unit 42P connector
terminal No. 24 and the steering angle sensor 4P connector termi-
nal No. 2.
Is there continuity?
Check for an open in the CAN (-)
circuit: Check for continuity between the
VSA control unit 42P connector
terminal No. 40 and the steering angle sensor 4P connector termi-
nal No. 3.
Is there continuity?
Check the steering angle sensor: 1. S u b s t i t u t e a k n o w n - g o o d steering angle sensor.
2. Connect all of disconnected connector.
3. Clear the DTC.4. Test drive the vehicle around anumber of corners.
5. Verify the DTC.
Is DTC 27 indicated? VSA CONTROL UNIT 42P CONNECTOR
Repair open in the wire between
the steering angle sensor and
the VSA control unit. Wire side of
female terminals
STEERING ANGLESENSOR 4PCONNECTOR
Wire side of female terminals
Replace the steering angle sensor.
Repair open in the wire between
the steering angle sensor and
the VSA control unit.
Repair open in the wire between
the steering angle sensor and
the VSA control unit.
Replace the VSA modulator-con-
trol unit.
YRSA YM
(RED/WHT)
(RED)
(WHT)
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Troubleshooting
DTC 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 : AB S Solenoi d
Problem verification :
1 . Clea r th e DTC .
2. Test drive the vehicle.3. Verif y th e DTC .
Are DTC s 31 , 32 , 33 , 34 , 35 ,36, 37 , 3 8 indicated ? Th
e syste m is O K a t thi s time .
Chec k fo r loos e terminal s in th e
VS A contro l uni t 42 P connector . I f
necessary , substitut e a known -
goo d VS A modulator-contro l unit ,
and recheck .
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DTC 45, 46, 47, 48: VSA Solenoid

Problem verification:

1. Clear the DTC.

2. Test drive the
vehicle.

3. Verify the DTC.

Are DTCs 45, 46, 47, 48 indicated?

The system is OK at this time.

Check for loose terminals in the

VSA control unit 42P connector.

If necessary, substitute a known-

good VSA modulator-control

unit, and recheck.ProCarManuals.com

Troubleshooting
DTC 51 , 52 , 53 : Pum p Moto r
Check th e VS A MOTO R (4 0 A )
fus e i n th e under-hoo d fuse/rela y
box, an d reinstal l th e fus e i f i t i sOK .
Is th e fus e OK ?
Chec k fo r a n ope n in th e +B-M R
circuit :
1 . Disconnec t th e VS A contro l
uni t 42 P connector .
2 . Measur e th e voltag e betwee n
termina l No . 2 an d bod yground .
Is ther e batter y voltage ?
Chec k fo r a n ope n in th e M-GN D
circuit:Check fo r continuit y betwee n th e
VS A contro l uni t 42 P connecto r
terminal No . 1 an d bod y ground .
Is ther e continuity ?
Proble m verification :
1 . Clea r th e DTC .
2. Test drive the vehicle at 12
mph (2 0 km/h ) o r more .
3 . Verif y th e DTC .
I s DT C 51 , 5 2 o r 5 3 indicated ? Replac
e th e fuse , 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 . I f th e circui t i s OK ,
replac e th e VS A modulator-con -
tro l unit .
VSA CONTRO L UNI T 42 P CONNECTO R
Repai r ope n in th e wir e betwee n
th e VS A MOTO R (40A ) fus e an d
th e VS A contro l unit .
Repai r ope n i n th e wir e
betwee n th e VS A contro l uni t
an d bod y ground .
Repai r poo r groun d (G401 ,
G402) .
Th e syste m is O K a t thi s time .
Chec k fo r loos e terminal s i n th e
VS A contro l uni t 42 P connector .
I f necessary , substitut e a known -
goo d VS A modulator-contro l
unit, an d recheck .
Terminal sid e o f femal e terminal s
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DTC 54 : Valv e rela y
Chec k th e VS A (2 0 A ) fus e in 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 ?
Replac e th e fuse , an d recheck . I fth 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 . I f th e circui t i s OK ,
replac e th e VS A modulator-con -
tro l unit .
Chec k fo r a n ope n in th e +B-FS R
circuit:1. Disconnec t th e VS A contro l
uni t 42 P connector .
2 . Measur e th e voltag e betwee n
th e VS A contro l uni t 42 P con -
necto r termina l No . 6 an d
bod y ground . VS
A CONTRO L UNI T 42 P CONNECTO R
Wir e sid e o f femal e terminal s
I s ther e batter y voltage ? Repai
r ope n in th e wir e betwee n
the VS A (2 0 A ) fus e an d th e VS Acontro l unit .
Proble m verification :
1 . Connec t th e VS A control unit
42P connector .2. Clea r th e DTC .3. Test drive the vehicle.4. Verif y th e DTC .
I s DT C 5 4 indicated ?
The syste m is O K a t thi s time .
Chec k fo r loos e terminal s i n th e
VS A contro l uni t 42 P connector .If necessary , substitut e a known -
goo d VS A modulator-contro l
unit , an d recheck .
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Troubleshooting
DTC 55 : Su b Throttl e Moto r Fail-saf e Rela y
Chec k th e TC S (2 0 A ) fus e i n th eunder-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 fail-saf e rela y i n th e
under-hoo d rela y bo x C , an d
leav e th e rela y remove d (se e
sectio n 23 ).
I s th e rela y OK ?
Chec k fo r a shor t t o bod y groun din th e ST M FS R circuit :
1 . Disconnec t th e VS A converte r
uni t 26 P connector .
2 . Chec k fo r continuit y betwee n
termina l No . 1 2 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
+B-ST M circuit :
1 . Tur n th e ignitio n switc h O N
(II).2. Measur e th e voltag e betwee n
th e VS A converte r uni t 26 P
connecto r termina l No . 1 4
an d bod y ground .
I s ther e batter y voltage ?
Chec k fo r a n ope n i n the STM
FSR circuit :1. Tur n th e ignitio n switc h OFF .
2 . Reinstal l th e fail-saf e relay .
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 2
an d bod y ground .
I s ther e batter y voltage ?
(To pag e 19-235 )
Replac e th e fuse , 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 . I f th e circui t i s OK ,
replac e th e VS A converte r unit .
Replac e th e fail-saf e relay .
VSA CONVERTE R UNI T 26 P CONNECTO R
Wire sid e o f femal e terminal s
Repair shor t t o bod y groun d in
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 .
Repai r shor t t o powe r i n th e
wir e betwee n th e su b throttl e
moto r fail-saf e rela y an d th e VS A
converte r unit .
Repai r ope n in th e wir e betwee n
th e su b throttl e moto r fail-saf e
rela y an d th e VS A converte r unit .
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(From pag e 19-234 )
Chec k fo r a n ope n in th e +B-ST M
circuit :
1 . Connec t th e VS A converte r
unit 26 P connecto r termina lNo. 1 2 an d bod y groun d wit h
a jumpe r wire .
2 . Measur e th e voltag e betwee n
th e VS A converte r uni t 26 P
connecto r termina l No . 1 4
an d bod y ground . VS
A CONVERTE R UNI T 26 P CONNECTO R
JUMPERWIRE
Wire sid e o f femal e terminal s
I s ther e batter y voltage ? Repai
r ope n in th e wir e betwee n
th e su b throttl e moto r fail-saf e
rela y an d th e VS A converte r unit .
Chec k fo r loos e terminal s in th e
VS A converte r uni t 26 P connec -
tor . I f necessary , substitut e a
known-goo d VS A converte r unit ,
and recheck .
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