Auxiliary Air Valve - Subaru XT 1988 Service Manual

2-7 FUEL INJECTION SYSTEM
3) Measure resistance between terminal (2) and valve body,
and between terminal (3) and valve body,
Specified resistance:
Infinity (
00 )
n
If resistance is outside of specifications, replace the by. pass
air control valve.
Fig. 39
Auxiliary Air Valve
[1800cc model only]
INSPECTION
1)
Pinch the hose connecting the air intake duct and
auxiliary air valve and observe how the engine speed changes.
State of engine Engine speed
When engine is cold
Engine idle speed drops as
the hose is pinched.
When engine is hot
Reduction in engine speed
is within 100 rpm.
When pinching the hall, cover it with
I
rubber pllte or the
Fig. 40
2) As the engine Is started, the auxiliary air valve Is heated by
the built-In heater and its shutter valve closes gradually. This
causes the engine rpm to be lowered gradually until the
specified idling rpm is reached.
If the engine speed will not drop to the idling rpm smoothly,
the heater circuit or the heater power supply circuit may be
faulty. In this case, perform the following checks;
(1) Check the resistance value of the auxiliary air valve.
Disconnect the connector of the auxiliary air valve and
measure the resistance between the two terminals, using
a circuit tester.
Resistance value must be other than zero (0)
and infinity
(00).
If the resistance is zero (0) or infinity
(00),
replace the
auxiliary air valve with a new one.
like for protection.
Fig. 41
24