Subaru 1600 Service Manual page 179

(Hitachi)
To electronic
control module
•
Solenoid ..
To control
air cleaner •
To carburetor.
(C-W)
To low speed circuit
or high speed circuit
Fig. 5-16
A10-o92
control module
A10·143
4) Vacuum switch (I), thermosensor
and engine speed sensing circuit
These are additionally provided in the
ECC system so that better drive-
ability is assured by avoiding the
application of feedback.
1
Connectors
2 Vacuum switch (0)
3 Vacuum
switch
(I)
A10..Q94
Fig.5-17 Vacuum switch
EMISSION CONTROL SYSTEM
Spring
To intake manifold
or carburetor
Diaphragm
A10·145
Fig. 5-18 Vacuum switch
(Hitachi)
A10-146
(C-W)
A10-147
Fig.5-19 Thermossnsor
For ECM
For temperature
gauge
Lead wire
Thermistor
element 1
Thermistor
element 0
A10-148
Fig. 5-20 Thermossnsor
S) Vacuum switch (II)
The acceleration (increasing/decreasing
rate of the ON-duty duration) increases
for several seconds immediately after
this switch is turned off, allowing the
valve to sensitively respond to the
Rich-Lean mixture as measured by the
O
2
sensor. After a lapse of S seconds,
the acceleration returns to the steady-
state operating condition.
3) Determination of the duty ratio is as follows.
I~
Item
Device
1
Carburetor ECM
2 Water temperature
Thermoser
3
Is
O
2
sensor activated or not?
O
2
sens6r
4 Engine rpm
Engine speed sensing circuit
S Vacuum
Vacuum switch (I)
6
Sea level or high altitude? Grounding wire (Optional)
5-12