Throttle Body - Subaru XT 1988 Service Manual

FUEL INJECTION SYSTEM
2-7
Throttle Body
1800cc model
INSPECTION AND ADJUSTMENT
THROTTLE SENSOR
Fig. 31
To
@
Control unit
r - - - - ,
LW
2 5 1 - - - - - - - - - '
16 BA
W
2 1 1 - - - - - - - - - - - '
22 B
@(Black)
II
t
III I
ttl
@<BlaCk)
III t
I.~
I till
Idle contact
L2·1103
Before checking the idle contact, remove the intake duct.
Insert a thickness gauge between the stopper screw of the
throttle body and the stopper (portion
@ I.
and check for
continuity between (
@
and
@).
1)·
Make sure that
@
and
@
are conducting when the
throttle is closed fully.
2)
Make sure that
@
and
@
are conducting when the
thickness of gauge is
0.55
mm
(0.0217
in) (this corresponds to
throttle opening of 1.5°).
3)
Make sure that
@
and
@
are not conducting when the
thickness is
0.92
mm
(0.0362
in) (this corresponds to a
throttle opening of 2.5°).
21
4) If the above standards are not satisfied, loosen the screws
(two) securing the throttle switch to the throttle body, and
turn the throttle switch main body until the correct adjust·
ment is obtained.
Throttle
body
Fig. 32
Throttle opening signal
Connector
(Throttle
sensor side)
L2·1102
1)
Measure resistance between terminals
@
and
®.
Specified resistance:
6 -18
kn
If resistance is outside specifications, replace the sensor.
2) Measure resistance between terminals
®
and
CD.
Specified resistance:
5.8 - 17.8
kn
(Throttle valve
fully
closed)
1.5 - 5.1
kn
(Throttle valve
fully
opened)
Ensure that resistance changes smoothly between the fully-
closed and fully-opened throttle positions. If resistance is
outside specifications, replace the sensor.