Subaru XT 1988 Service Manual page 291

2-7 FUEL INJECTION SYSTEM
THROTTLE SENSOR SYSTEM 2700
cc
model
A throttle position sensor is provided with a potentiometer
and idle switch interlocked with the throttle valve shaft is
utilized.
This throttle position sensor sends the MPF I control unit a
potentiometer output signal corresponding to the opening of
the throttle valve and an idle switch signal that turns ON only
when the throttle is opened nearly to the idle position.
Using these signals, the MPF I control unit precisely controls
the air-fuel ratio during acceleration and deceleration as wetl
as idling.
1800
cc
model
Fig.
3
4
Power (Idle switch)
3
GND
2
Power (Sensor)
Sensor signal
Throttle sensor
L2·1087
4
1
Power (Sensor)
2
Sensor signal
3
Power (Idle switch)
4
GND
Fig. 4
~
,.. -
L2·1467