Honda Prelude 1993 Service Manual page 708

Troubleshooting (4WSl
Diagnostic Trouble Codes (DTCs): 21' 23, 25, 29 lcont'dl
View from terminal side
. 5 v ? ( V
v
View from terminal side
REAR MAIN STEERING ANGLE SENSOR
4WS CONTROL UNIT SIDE CONNECTOR
4WS CONTROL UNIT 18P/12P
CONNECTOR
I
l 2 o H l
I
ri+ffi M
( v )
Y
O - 4
Porform trouble.hooting
of
the DTCs 11, 13, 17. (.o6 psgo
t7-501
4 . 5
o
4 . 5
0
4 . 5
0
A-phase
B-phase
Z-pha86
(From page 17-611
M€asure voltsge betwson the
No,6 terminsl {BLU/GRNI and the
No. I terminal (RED) of the 4WS
contrcl unit aide connector ot the
reat main steedng angle sensor.
R.p.l
opcn In th. RED wir. bo-
twocn tho 4WS cont?ol unit and
tha ra.] maln ltooting anglo
Itn!o1,
ls there €pproximately 4.5 V?
Rsconngctthe rear main ateering
sngle sonsot 8P connector.
While turning th€ steering whe€|,
check for the signals betwe€n the
following 4WS conttol unit termi-
n6ls and the body ground with an
analog voltmeter on the DC range.
A-phase:
Eetween the No. 6 terminal
(WHT/GRN) ahd body ground:
should pulse O-4.5 V rapidly lev-
ery 2o)
B-phase:
Between thc No. 13 terminal
(BLU/GRN) and body ground:
should pulse O-4.5 V rapidly (ov'
ery 2ol
Z-phaae:
Betwesn the No. 20 terminal
IORN) and body ground: should
pulso O€4.5 V once per ste6ring
wheel revolution
Are the signals available be-
tween lhe resDective terminal
and the body ground?
Check the Z-phase neutral Posi-
tion {seo page 1 7-'146).
ls the Z-phase in the straighi
driving position?
17-62
---------------- Time