TOYOTA PREVIA 91-97 REPAIR MANUAL

4-8 DRIVEABILITY AND EMISSIONS CONTROLS

Fig. 13 Check that air flows from port E to the air filter of the

Fig. 11 Testing the check valve for air flow on each side VSV

Fig. 12 Only install the check valve with the orange side f icing

the No. 2 air inlet duct

Vacuum Switching Valve (VSV)

FILTERED TYPE

» See Figures 13,14,15 and 16

The VSV is attached to the No. 2 air inlet duct. Some VSV mod

equipped with an air filter at the end.

1, Check that air flows from port E to the air filter.

2 Connect the vacuum switching valve terminals to the bat-

tery.

3. Check that air flows from port E to port F.


4. If the VSV fails this test replace it. Any doubts perform the f
   test.


5. Remove the VSV.


6. Check for an open circuit. Using an ohmmeter, measure the
   tance (ohms) between the two terminals of the valve. The resistant
   should be 30-34 ohms. If the resistance is not within specificatio
   replace the VSV.


7. Check for a short circuit within the valve. Using an ohmmet
   that there is no continuity between the terminals and the VSV bod
   is continuity, replace the VSV.

sare

[lowing

esis-

3 (cold)

r, check

It there

Fig. 14 Apply battery voltage across the terminals of the VSV

Ohmmeter

Fig. 15 Check for open ground on the VSV using an ohmmeter