AC/Air Conditioning System — Vacuum Switching Valve (VSV) (See page AC-22) Inspection of VSV, page 42

AC-42     AIR CONDITIONING SYSTEM — Vacuum Switching Valve (VSV)

VACUUM SWITCHING VALVE (VSV)
(See page AC-22)

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 that air comes out of
            the filter "G".

      If a problem is found, repair or replace the VSV.

2.    CHECK FOR SHORT CIRCUIT

      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, measure the resistance between the
      two terminals.

      Resistance:  38 — 43 Ω (cold)

      If resistance is not within specification, replace the VSV.