Vacuum Switching Valve (Vsv - Toyota Celica Supra 1986 Service And Repair Manual

AC-42
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AIR CONDITIONING SYSTEM- Vacuum Switching Valve (VSVI
VACUUM SWITCHING VALVE
(VSV)
(See .,.._ AC.221
INSPECTION OF VSV
1. CHECK VACUUM CIRCUIT CONTINUITY IN VSV BY
BLOWING AIR INTO PIPES
(a) Connect the VSV terminals to the battery terminals
as illustrated.
(b) Blow into pipe ••F'' and check that air comes out of
pipe "E".
(c) Disconnect the battery.
(d) Blow into pipe " f " and check thllt air comes out ol
the filter "G".
If a problem is found. repair or replace the VSV.
2. CHECK FOR SHORT CIRCUI T
Using an ohmmeter, check
that
there is no continuity
between each terminal and the VSV
body.
If there is continuity, replace the VSV.
3. CHECK FOR OPEN CIRCUIT
Using an ohmmeter.
musure the resistance between
the
two
terminals.
Resis-: 38 - 43
n
(cold)
If
resistance is
not within specification, replace
the
VSV.