1996 ACURA RL KA9 Service Repair Manual

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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