Vacuum Solenoid Valve HVAC: Testing and Inspection

VSV INSPECTION


1. REMOVE VSV


2. CHECK VACUUM CIRCUIT CONTINUITY IN VSV BY BLOWING AIR INTO PIPES





a. Connect the VSV terminals to the battery terminals, as shown illustration.
b. Blow into pipe A and check that air comes out of pipe "B".







c. Disconnect the battery.
d. Blow into pipe A' and check that air does not come out of pipe "B".

If a problem is bound, replace the VSV.







3. CHECK FOR SHORT CIRCUIT
Using an ohmmeter, check that there is no continuity between each terminals and the VSV.

If there is continuity, replace the VSV.







4. CHECK FOR OPEN CIRCUIT
Using an ohmmeter, measure the resistance between terminals.

Resistance:
30 - 34 Ohms at 20° C (68° F)

If resistance value is not as specified, replace the VSV.