ACURA RL KA9 1996 Service Repair Manual

Troubleshooting

DTC 58: Engine Speed Signal

Check for a short to body ground

in the NEP circuit:

1. Disconnect the VSA converter

unit 26P connector, the PCM

connector C (12P) and the

gauge assembly 22P connec-

tor.

2. Check for continuity between

the PCM connector C (12P)

terminal No. 8 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. 8 and body ground.

Is there about 6V?

Check for an open in the NEP cir-

cuit:

Measure the voltage between the

VSA converter unit 26P connec-

tor terminal No. 21 and body

ground.

Is there about 6 V?

The system is OK at this time.

If the problem recurs, replace

the VSA converter unit.
PCM CONNECTOR C (12P)

Wire side of female terminals

Repair short to body ground in

the wire between the VSA con-

verter unit, PCM and the gauge

assembly.

NOTE:

Use the 10 V range or a similar range in

an analog tester.

Check with the engine idling and

warmed-up.

Check for loose terminals in the

PCM connectors. If necessary,

substitute a known-good PCM,

and recheck.

NOTE:

Use the 10 V range or a similar range in

an analog tester.

Check with the engine idling and

warmed-up.

VSA CONVERTER UNIT 26P CONNECTOR

Repair open in the wire between

the PCM and the VSA converter

unit.

Wire side of female terminalsProCarManuals.com

DTC 61 , 62 : +B-FS R Voltag e
Problem verification :1. Clea r th e DTC .2. Test drive the vehicle at 6 mph(1 0 km/h ) o r more .3. Verif y th e DTC .
I s DT C 6 1 o r 6 2 indicated ?
The syste m is O K a t thi s time .
Chec k th e chargin g system .
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Troubleshooting

DTC 63: Reference Voltage

Check for a short to body ground

in the VREF circuit:

1. Disconnect the PCM connec-

tor D
(22P)
and the VSA
con-

verter unit 26P connector.

2. Check for continuity between

the PCM connector D (22P)

terminal No. 20 and body

ground.

Is there continuity?

Is there about 5 V?

Check for an open in the VREF

circuit:

Measure the voltage between the

VSA converter unit 26P connec-

tor terminal No. 23 and body

ground.

Is there about 5 V?

The system is OK at this time.

If the problem recurs, replace

the VSA converter unit.
Repair short to body ground in

the wire between the PCM and

the VSA converter unit.

Check for loose terminals in the

PCM connectors. If necessary,

substitute a known-good PCM,

and recheck.
PCM CONNECTOR D (22P)

Wire side of female terminals

VSA CONVERTER UNIT 26P CONNECTOR

Repair open in the wire between

the PCM and the VSA converter

unit.
Wire side of female terminals
Check the PCM:

1. Connect the PCM connector D

(22P).

2. Turn the ignition switch ON

(II).

3. Measure the voltage between

the PCM connector D (22P)

terminal No. 20 and body

ground.ProCarManuals.com

DTC 64 : Senso r Powe r Sourc e
Check fo r a shor t t o bod y groun d
i n th e PS U circuit :
1 . Disconnec t th e VS A contro l
unit 42 P connecto r an d th epressur e senso r 3 P connector .
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 . 4 2 an d
bod y ground .
I s ther e continuity ?
Chec k fo r a shor t t o bod y groun d
i n th e YRS A Y U circuit :
1 . Disconnec t th e ya w rate/later -
a l acceleratio n senso r 6 P con -
necto r an d th e steerin g angl e
senso r 4 P connector .
2 . Chec k fo r continuit y betwee n
the VS A contro l uni t 42 P con -necto r termina l No . 3 9 an d
bod y ground .
I s ther e continuity ?
Proble m verification :
1. Clea r th e DTC .2. Test drive the vehicle at 6 mph(km/h ) o r more .
3 . Verif y th e DTC .
I s DT C 6 4 indicated ?
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
uni t an d recheck . VS
A CONTRO L UNI T 42 P CONNECTO R
Wire sid e o f femal e terminal s
Repair shor t t o bod y groun d i n
th e wir e betwee n th e pressur e
senso r an d th e VS A contro l unit .
Repai r shor t t o bod y groun d i n
th e wir e betwee n th e ya wrate/latera l acceleratio n sensor ,
th e steerin g angl e senso r an d
th e VS A contro l unit .
Th e syste m is O K a t thi s time .
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Troubleshooting
DTC 65 : Brak e Flui d Leve l
Is th e leve l OK ?Refil l th e brak e fluid .
Chec k th e brak e flui d leve l switch .
Is th e switc h OK ?Replac e th e brak e flui d leve l
switch .
VSA CONTRO L UNI T 42 P CONNECTO R
Chec k fo r a shor t t o bod y groun d
i n th e BF L circuit :
1 . Disconnec t th e VS A contro l
unit 42 P connector .2. Tur n th e ignitio n switc h O N (II) .3. Measur e th e voltag e betwee nthe VS A contro l uni t 42 P con -necto r termina l No . 3 6 an dbod y ground .
Is ther e batter y voltage ? Repai
r shor t t o bod y groun d i nth e wir e betwee n th e gaug eassembl y an d th e VS A contro lunit.
Wire sid e o f femal e terminal s
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 -good VS A modulator-contro l
unit , an d recheck .
Chec
k th e brak e flui d level .
ProCarManuals.com

DTC 66 : Pressur e Senso r
Check th e brak e switch .
I s th e switc h OK ?
Chec k fo r a n ope n i n th e STO P
circuit :
1 . Disconnec t th e VS A contro l
unit 42 P connector .2. Measur e th e voltag e betwee nthe VS A contro l uni t 42 P con -necto r termina l No . 3 2 an d
bod y groun d whe n th e brak e
peda l i s pressed .
I s ther e batter y voltage ?
I s ther e batter y voltage ?
Chec k fo r a shor t t o bod y groun d
i n th e pressur e senso r circuits :
1. Tur n th e ignitio n switc h OFF .2. Chec k fo r continuit y betwee nbody groun d an d th e VS Acontro l uni t 42 P connecto rterminal No . 25 , No . 2 6 an dNo. 4 2 individually .
Is ther e continuity ?
Chec k fo r a n ope n in th e PS U cir -
cuit :
Chec k fo r continuit y betwee n th eVS A contro l uni t 42 P connecto rterminal No . 4 2 an d th e pressur e
senso r 3 P connecto r termina l No .
1.
Is ther e continuity ?
(T o pag e 19-242 ) Replac
e th e brak e switch .
VSA CONTRO L UNI T 42 P CONNECTO R
Repai r ope n i n th e wir e betwee n
th e brak e switc h an d th e VS A
contro l unit . 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 pressur e senso r an d
th e VS A contro l unit .
Repai r shor t t o bod y groun d i n
th e wir e betwee n th e pressur e
senso r an d th e VS A contro l unit .
Repai r ope n i n th e wir e betwee n
th e pressur e senso r an d th e VS Acontro l unit .
PRESSUR E SENSO R3P CONNECTO R
Wir e sid e o f femal e terminal s
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Troubleshooting
DTC 66 : Pressur e Senso r (cont'd )
(From pag e 19-241 )
Chec k fo r a n ope n in th e PS S cir -
cuit :
Chec k fo r continuit y betwee n th e
VSA contro l uni t 42 P connecto rterminal No . 2 6 an d th e pressur e
senso r 3 P connecto r termina l No .
2.
Is ther e continuity ?
Chec k fo r a n ope n in th e PS M cir -
cuit :
Chec k fo r continuit y betwee n th e
VSA contro l uni t 42 P connecto rterminal No . 2 5 an d th e pressur e
senso r 3 P connecto r termina l No .
3.
Is ther e continuity ? Repai
r ope n i n th e wir e betwee n
th e pressur e senso r an d th e VS A
contro l unit .
Repai r ope n i n th e wir e betwee n
th e pressur e senso r an d th e VS A
contro l unit . VS
A CONTRO L UNI T 42 P CONNECTO R
PRESSUR E SENSO R
3 P CONNECTO R
Wir e sid e o f femal e terminal s
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 .
ProCarManuals.com

DTC 68: Brake Pedal Position Switch

Is there battery voltage?

Check for an open in the STOP

circuit:

Measure the voltage between the

VSA control unit 42P connector

terminal No. 32 and body ground

when the brake pedal is pressed.

Is there battery voltage?
Replace the brake pedal position

switch.

VSA CONTROL UNIT 42P CONNECTOR

Repair short to power in the wire

between the brake pedal position

switch and the VSA control unit.
Terminal side of female terminals

Repair open in the wire between

the brake pedal position switch

and the VSA control unit.

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 71: Abnormal Wheel Speed Signal

Are any DTCs except 71 indicated?

Check the tires.

Are tires with specified size and

inflated to specification?

Check for brake drag.

Do the brakes drag?

Visually check for appropriate

wheel sensor and pulser installa-

tion (see table).

Are they installed correctly?

Check the four pulser gears for a

chipped tooth (see table).

Is the pulser OK?

Problem Verification:

1. Clear the DTC.

2. Test-drive the vehicle at 19

mph (30 km/h) or more.

3. Verify the DTC.

Is DTC 71 indicated?

YES

Check for loose terminals in the

VSA control unit 42P connector.

If necessary, substitute a known-

good VSA modulator-control

unit, and recheck.
Preform the appropriate trou-

bleshooting for the DTC.

Replace the tire(s) with the spec-

ified size.

Repair the brake drag.

Reinstall or replace the wheel

sensor or pulser.

Replace the driveshaft or hub

unit. (Chipped pulser gear.)

The system is OK at this time.
Verify the DTC.ProCarManuals.com

DTC 81 : VS A Contro l Uni t
Is DT C 8 1 indicated ? Intermitten
t failure ; th e vehicl e i sO K at thi s time .
Proble m verification :1. Clea r th e DTC .2. Test drive the vehicle.
3 . Verif y th e DTC .
Replac e th e VS A modulator -
contro l unit .
ProCarManuals.com