Honda Prelude 1993 Service Manual page 704

Troubleshooting
Diagnostic Trouble
(4WS)
Codes IDTCs): 20, 22, 24, 2A (cont'd)
(From page 17-57)
Check for voltage between the
No.2 terminal IYEL/RED) and the
No. 5 terminal IELK) of the 4WS
control unit side connector of the
front main steering angle sensor.
Rcpair tho poor ground lG 4Ol,
402, 4041or oDen in rhe BLK wiro
botwo€n th6 front main atooring
anglo 3onsor and body ground.
ls there approximately 4.5 V?
Reconnect th€ front main steering
angle sensor 5P connector,
While turning the steering wheel,
check for the signals between the
following 4WS control unit termi'
nals and the body ground with an
analog voltmoter on the DC range.
A-phase:
Betwsen tho No. 8 terminal (GRN)
and body ground: should pulse
O-4.5 V rspidly {every 2o)
B-phas6:
Between th€ No. 15 terminal
(YEL/RED) and body ground:
should pulse 0e4.5 V rapidly (ev
€ r y 2 o )
Z-ph8se:
Bgtween the No. 12 terminal
IBLU) and body ground: should
pulse 0*4.5 V once per steoring
wheel revolution
Are the signals available be-
tween the resp€ctive terminal
and the body ground?
Check the Z-phase neutral posi'
t i o n ( s e e p a g e 1 7 - 1 4 6 ) .
adjust the front main stooring an-
glo sonsor noutral poaition
{soo pago 17-15)
ls the Z'phase in the straight
driving position?
FRONT MAIN ST€EBING ANGLE SENSOR
4WS CONTROL UNIT SIDE CONNECTOR
[T'T-TT;I
l ^
\:/
4.5 V?
View from terminal side
4WS CONTROL UNIT 18P CONNECTOR
0 - 4
. 5 v ? ( V ) ( V ) ( V
View from terminal side
Y E S
Podorm troublgshooting lor OTCa
1 0 . ' 1 2 . 1 6 .
{3e6 pag6'17451.
A-phase
B-phase
Z-phase
o
4 . 5
0
4 . 5
Srraight
l revolustion
---------------- Time
17 -58
L-